Skocz do pozycji: 1.

Tytuł:

Electrokinetic and flotation behavior of rutile in the presence of lead ions and aluminium ions

Autorzy:

Cheng, Hongwei
Liu, Changmiao
Guo, Zhenxu
Feng, Ansheng
Wei, Min
Lv, Zihu
Wu, Dongyin
Zhao, Dengkui

Powiązania:

https://bibliotekanauki.pl/articles/110558.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

lead ions
aluminium ions
rutile
flotation

Opis:

The effects of Pb(II) ions and Al(III) ions on the electro kinetic and flotation behavior of rutile were investigated by micro-flotation tests, zeta potential measurements and solution chemistry analysis. Micro-flotation results indicate that the Pb(II) ions can effectively improve the flotation recovery of rutile while the Al(III) ions significantly inhibit the flotation of rutile. Zeta potential measurements reveal that a collector styrene phosphoric acid (SPA) can adsorb on the rutile surface after the addition of Pb(II) ions, but hardly adsorb on the rutile surface after the addition of Al(III) ions. Pb(II) ions adsorb on the rutile surface in the form of Pb(OH)+ and Pb(OH)2(s), and the latter one is the main reason that activates rutile flotation. Al(III) ions adsorb on the rutile surface mainly in the form of Al(OH)3(s), which prevent the direct interaction between the rutile and the collector, resulting in a decrease of rutile flotation recovery.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 2; 458-466
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Application of instruments of nuclear physics to the calculation of theoretical dose distributions in various organs of the human body for beams used in hadrontherapy

Autorzy:

Maliszewska, W.
Sękowski, P.
Skwira-Chalot, I.

Powiązania:

https://bibliotekanauki.pl/articles/146972.pdf

Data publikacji:

2016

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

carbon ions
hadrontherapy
hydrogen ions
SRIM
Xeloss

Opis:

The area of interests of nuclear physics are studies of reactions, wherein atomic nuclei of projectile collide with target nuclei. An amount of energy lost by projectile nucleus during its passing through the target is a major issue – it is important to know how charged particles interact with matter. It is possible to afford this knowledge by using theoretical programs that calculate energy loss applying the Bethe-Bloch equation. Hadrontherapy, which is a field of still growing interest, is based on the interactions of charged particles with matter. Therefore, there exists a need of creating a simple model that could be used to the calculation of dose distributions in biological matter. Two programs (SRIM, Xeloss), used to the calculation of energy loss by nuclear physicist, have been adapted to determine the dose distributions in analogues of human tissues. Results of the calculations with those programs for beams used in hadrontherapy (e.g. 1H, 12C) will be compared with experimental data available in references.

Źródło:

Nukleonika; 2016, 61, 1; 19-22
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Influence of diaphragms on measurements of ions emitted from dense magnetized plasmas

Autorzy:

Skladnik-Sadowska, E.
Sadowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/146562.pdf

Data publikacji:

2001

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

diagnostic of ions
energy distribution
plasma discharges
separate ions

Opis:

The paper concerns the diagnostics of ions escaping from dense magnetized plasma (DMP) discharges. Particular attention is paid to the basic problem of the separation of such ions from the investigated plasma, under the condition that this process should not disturb the velocity (and energy) distribution functions of the measured ions.

Źródło:

Nukleonika; 2001, 46, suppl. 1; 57-60
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Adsorption kinetic, equilibrium and thermodynamic investigations of Zn(II) and Ni(II) ions removal by poly(azomethinethioamide) resin with pendent chlorobenzylidine ring

Autorzy:

Kumar, P. S.
Ethiraj, H.
Venkat, A.
Deepika, N.
Nivedha, S.
Vidhyadevi, T.
Ravikumar, L.
Sivanesan, S.

Powiązania:

https://bibliotekanauki.pl/articles/780002.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

adsorption
models
Ni(II) ions
poly(azomethinethioamide)
Zn(II) ions

Opis:

This paper reports the application of poly(azomethinethioamide) (PATA) resin having the pendent chlorobenzylidine ring for the removal of heavy metal ions such as Zn(II) and Ni(II) ions from the aqueous solutions by adsorption technology. Kinetic, equilibrium and thermodynamic models for Zn(II) and Ni(II) ions adsorption were applied by considering the effect of contact time, initial metal ion concentration and temperature data, respectively. The adsorption influencing parameters for the maximum removal of metal ions were optimized. Adsorption kinetic results followed the pseudo-second order kinetic model based on the correlation coefficient (R2) values and closed approach of experimental and calculated equilibrium adsorption capacity values. The removal mechanism of metal ions by PATA was explained with the Boyd kinetic model, Weber and Morris intraparticle diffusion model and Shrinking Core Model (SCM). Adsorption equilibrium results followed the Freundlich model based on the R2 values and error functions. The maximum monolayer adsorption capacity of PATA for Zn(II) and Ni(II) ions removal were found to be 105.4 mg/g and 97.3 mg/g, respectively. Thermodynamic study showed the adsorption process was feasible, spontaneous, and exothermic in nature.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 3; 100-109
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Investigation on different behavior and mechanism of Ca(II) and Fe(III) adsorption on spodumene surface

Autorzy:

Yu, F.
Wang, Y.
Wang, J.
Xie, Z.

Powiązania:

https://bibliotekanauki.pl/articles/110230.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

spodumene surface
calcium ions
iron ions
adsorption mechanism
DFT calculation

Opis:

Behavior and mechanism of Ca2+ and Fe3+ adsorption on spodumene surface were investigated by micro flotation tests, zeta potential measurements, and density functional theory (DFT) calculation methods. The micro flotation tests showed that Ca2+ and Fe3+ activated the flotation of spodumene remarkably. However, the effect of Fe3+ was more significant than that of Ca2+. Additionally, Fe3+ significantly changed the zeta potential of spodumene while Ca2+ showed a little change. Meanwhile, the calculated adsorption energy of Fe3+ on spodumene surface was much greater than that of Ca2+ indicating that Fe3+ is more apt to be adsorbed on spodumene surface than Ca2+. The value of bond population in Ca-O illustrated that the bond of Ca-O consists of partial covalent proportion and some ionic component. On the contrary, the bond of Fe-O showed a relatively strong covalent property. The partial density of states (PDOS) of free Ca/Fe and the reacted O atom on spodumene (110) surface before and after the adsorption showed that Fe 3d orbital and O 2p orbital formed hybridization. The density of states (DOS) near the Fermi level of spodumene surface after adsorption with Fe3+ was much stronger than that with Ca2+.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 2; 535-550
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Study of process water effect on the activation of sphalerite during differential flotation of Pb-Cu-Zn

Autorzy:

Gutiérrez Pérez, Victor Hugo
Olvera Vázquez, Seydy Lizbeth
Santos Madrid, Rocio
Regino Piña, Rafael
Cruz Ramírez, Alejandro
Rivera Salinas, Jorge Enrique
Alaniz Hernández, Daniel Israel

Powiązania:

https://bibliotekanauki.pl/articles/2146897.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

sphalerite activation
process water
differential flotation
copper ions
lead ions

Opis:

This work was aimed to analyze the effect of concentration of Cu.2+ and Pb.2+ ions in flotation process water with sphalerite activation, the analysis was performed at Cozamin Mining flotation circuit. This analysis demonstrated that (i) it was possible to determine the relationship between Sodium Cyanide and Ammonium Bisulfite used as depressants and Cu.2+ and Pb.2+ contents in the process water. (ii) It also proved the relationship between lead and iron content in the head with the Pb.2+ ions in process water. According to the data gathered and analysis performed, (iii) it was also determined that it was possible to reuse process water as long as the use of Ammonium Bisulfite was reduced and recommended replacing the use of Sodium Cyanide with Zinc Sulfate (ZnSO4) as a depressant of Sphalerite. Additionally, the concentration of Cu.2+ and Pb.2+ ions in the water should be controlled in a range of 10 to 20 ppm and 0.10 to 0.20 ppm, respectively.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 146906
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

On the nature of silver ions in complex media

Autorzy:

Loza, K.
Diendorf, J.
Sengstock, C.
Koller, M.
Epple, M.

Powiązania:

https://bibliotekanauki.pl/articles/286036.pdf

Data publikacji:

2014

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

silver ions
biocides
biomaterials

Opis:

Antimicrobial biocides are commonly used to present the growth of bacteria on surfaces and within materials. They are typically added in small quantities to many applications to prevent bacterial growth on the treated object. Silver is increasingly used in many applications due to the aim to replace organic chemical agents by inorganic additives. Examples of applications are bacteriostatic water filters for household use or swimming pool algaecides and numerous devices, ranging from consumer commodities like mobile phones, refrigerators, and clothes to medical devices like catheters, implant surfaces, and plasters. To meet the diversity of application types, many different forms of silver compounds have been developed to serve this market. In particular, there is little information on the types of transformations that silver nanoparticles will undoubtedly undergo in real, complex environments during long-term aging, and the impact of these transformations on their distribution in the environment, bioavailability, and toxicity potential. The biocidal action results from the interaction of silver ions with bacteria. The most potent compounds for a high silver release are soluble silver salts like silver nitrate or silver acetate. These are fully water soluble with a high silver ion release rate. Therefore they are often used as control in cell experiments to elucidate the biological effect of silver nanoparticles. However, in the case of free silver nanoparticles the interactions can be more complex and catalytic reactions on the particle surface which depend on the size and shape of the nanoparticles can render the system very complex. If AgNO3 is used as control, it is tacitly assumed, that the free silver ion concentration is the same as that in the added AgNO3. This obviously cannot be true because of the presence of a whole set of proteins, biomolecules and inorganic ions like Cl- and H2PO4- in the biological medium. These will react with the silver ions in one or the other way. We report on experiments on the behaviour of silver ions in biologically relevant concentrations in different media, from physiological salt solution over phosphate-buffered saline solution to cell culture media. For dissolution and immersion experiments PVP-coated silver nanoparticles were synthesized by reduction with glucose in the presence of PVP. The final silver concentration in all dispersions was determined by atomic absorption spectroscopy. The dissolution of silver nanoparticles was followed in long-term experiments out of a dialysis tube which was permeable only for silver ions. In case of immersion experiments, the nanoparticles and all precipitates were isolated by ultracentrifugation, redispersed in pure water and again subjected to ultracentrifugation. The particles were analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray powder diffraction. The dissolution requires the presence of dissolved oxygen. If no oxygen is present, only a very small fraction of silver is dissolved, possibly by traces of oxygen in the experimental setup. An oxidizing agent like H2O2 clearly enhances the dissolution. The presence of NaCl, either in pure form or as PBS, strongly slows down the dissolution, probably due to silver chloride formation. Cysteine has a clearly inhibiting effect with almost no dissolution of the silver nanoparticles whereas glucose has a decelerating effect but leads to a similar final dissolved fraction. This suggests that cysteine adsorbs onto the silver nanoparticle surface with its thiol group and prevents the oxidation. In contrast, glucose slows down the dissolution, but clearly did not prevent the oxidation on a longer time scale. We have extended the studies by mixing silver nanoparticle dispersions with different media of increasingly biological nature. The solutions/dispersions were stirred for equilibration and then subjected to ultracentrifugation. All precipitates and nanoparticles were isolated by this way and then analyzed. The results show that both initially present silver ions and released silver ions are mainly precipitated as AgCl if chloride is present. Only in the absence of chloride, glucose is able to reduce Ag+ to Ag0. The initially present silver nanoparticles were recovered in all cases. Silver phosphate was not observed in any case, probably due to the moderate pH (around 7) at which phosphate is mostly protonated to hydrogen phosphate and dihydrogen phosphate. We can conclude that released silver ions precipitate mostly as AgCl in biological media, and that most cell culture studies where silver ions are used as control are in fact studying the effect of colloidal silver chloride on the cells. To prove this assumption, human mesenchymal stem cells (hMSC) were cultured in the presence of silver chloride nanoparticles (diameter 120 nm), and the viability of the cells was analyzed by fluorescence microscopy. In general, we clearly observed that pure silver nanoparticles have lower toxicity to hMSC compared to silver chloride nanoparticles with a comparable total silver dose. Silver acetate in the biological medium had a comparable toxicity to hMSC compared to silver chloride nanoparticles with the same total silver dose.

Źródło:

Engineering of Biomaterials; 2014, 17, no. 128-129; 80
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Biosorption Capacity of Activated Sludge Sand Bed for Removal of Copper from Treated Wastewater

Autorzy:

Trybułowski, Łukasz
Rogowska, Weronika
Zakrzewski, Jakub

Powiązania:

https://bibliotekanauki.pl/articles/2027810.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

copper ions
biosorption
wastewater

Opis:

In this paper, the biosorption capacity of activated sludge sand bed was investigated for copper removal from wastewater. A sand bed consisting of three layers was used for the study: (1) filter gravel with a diameter of 2 to 3 mm, (2) a biological part inoculated with 200 ml of flocculent activated sludge with a dry weight of 5 kg/$m^3$, (3) filter sand with a grain diameter of about 3 mm. The filter was fed with model wastewater prepared with sodium acetate, potassium nitrate, ammonium chloride, and potassium dihydrogen phosphate I and II basic. The source of Cu ions in the wastewater was $CuSO_4$. The model wastewater used in this study was collected every 24 hours. The experiment was terminated when the concentration of Cu in the treated wastewater sample was equal to that in the treated wastewater. Such a phenomenon was indicative of the depletion of the sorption capacity of the tested bed, which was observed after 26 days. The concentration of copper in raw and effluent from the bed was studied using atomic absorption spectroscopy (ASA) in samples mineralized in nitric acid ($HNO_3$) with the addition of perhydrol ($H_2O_2$). Two equilibrium models, Langmuir and Freudlich, were analyzed to study the absorption isotherms.

Źródło:

Journal of Ecological Engineering; 2022, 23, 2; 61-69
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

A Superconducting Cyclotron as a primary accelerator for exotic beam facilities

Autorzy:

Maggiore, M.
Rifuggiato, D.
Calabretta, L.

Powiązania:

https://bibliotekanauki.pl/articles/146203.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

cyclotron
ions
medical
superconducting

Opis:

A four sector compact superconducting cyclotron for light ion beams with a maximum energy of 250 MeV/amu has been studied. This cyclotron is mainly designed to accelerate H2 + ions to be extracted by stripping. Ions like C, O or Ne can also be accelerated and extracted by stripping. Extraction by stripping allows to overcome many problems, especially if a certain beam intensity is requested. The preliminary design model of the magnet circuit has been accomplished with the 3D electromagnetic code OPERA [4]. The design of the main coils and of the cryostat has been investigated, too. The features of beam dynamics of this cyclotron, including extraction trajectories, will be presented. Several fields of application have been envisaged for this cyclotron, namely nuclear physics, therapy treatment, interdisciplinary research and radioisotope production using low or medium intensity beams.

Źródło:

Nukleonika; 2003, 48,suppl.2; 165-167
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Various ionic substitutions in hydroxyapatites - physicochemical studies

Autorzy:

Kolmas, J.
Laskus, A.
Szurkowska, K.
Pajor, K.
Pajchel, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/285828.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

hydroxyapatite
ions
physicochemical analysis

Źródło:

Engineering of Biomaterials; 2018, 21, 148; 45
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Environmentally and Economically Feasibility Manufacturing Process of Potassium Nitrate for Small Scale Industries: A Review

Autorzy:

Joshi, C. S.
Shukla, M. R.
Patel, K.
Joshi, J. S.
Sahu, O.

Powiązania:

https://bibliotekanauki.pl/articles/411997.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Chemical
discharge
ions
Salts
Waste

Opis:

Potassium Nitrate (PN) is of the basic need of chemical industry. With increase of demand in different production section of fertilizer, pharmaceutical, explosive, food industry etc, potassium nitrate the production becoming non economical to industry. The operating conditions and parameters are the main factors, which responsible for maximised the profits. The main aim of this study is to compared the production potassium nitrate in profitable as well as environmentally suitability way. From the literature different manufacturing process has been summarized for concluding this study.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2015, 41; 88-99
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Application of polymer inclusion membranes doped with 1-hexyl-4-methylimidazole for pertraction of zinc(II) and other transition metal ions

Autorzy:

Ulewicz, M.
Radzyminska-Lenarcik, E.

Powiązania:

https://bibliotekanauki.pl/articles/110567.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

polymer inclusion membrane
PIM
metal ions separation
zinc(II)
transition metal ions
imidazole derivatives

Opis:

Transport of Zn(II) from unary aqueous chloride solutions and from solutions which contain mixtures of Cd(II), Co(II) and Ni(II) ions in source phases (cMe = 0.001 mol/dm3, pH = 6.0) across polymer inclusion membranes (PIMs) doped with 1-hexyl-4-methylimidazole as ion carrier was studied. The use of 1-hexyl-4-methylimidazole enables the separation of 98.5% Zn(II) from a unary solution and 96.9% from a quaternary solution of Zn(II)-Cd(II)-Co(II)-Ni(II) after running the process for 24 hours. Using that ion carrier, the metals are transported in the following order: Zn(II) > Cd(II) > Ni(II) > Co(II), and the selectivity coefficients of Zn(II)/Cd(II), Zn(II)/Ni(II), and Zn(II)/Co(II) are 12.9, 23.4 and 40.8, respectively. Findings of atomic force microscopy (AFM) examinations as well as thermograms of a polymer inclusion membrane containing 1-hexyl-4-methylimidazole are also presented. A membrane with 1.0 mol/dm3 of carrier has a porosity of 15.8%, and roughness of 6.6 nm. The membranes remain thermally stable at temperatures up to 200oC. The findings were compared with earlier-reported results for 1-hexylimidazole.

Źródło:

Physicochemical Problems of Mineral Processing; 2015, 51, 2; 447-460
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Germanate glasses co-doped with Ce3+/Ln3+ (Ln = Pr, Tb, Dy) for white light emitting diodes

Autorzy:

Górny, Agata
Sołtys, Marta
Pisarska, Joanna
Pisarski, Wojciech A.

Powiązania:

https://bibliotekanauki.pl/articles/173993.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

glasses
rare earth ions
white luminescence

Opis:

Glasses doped with lanthanides ions may be good white light emitters due to their interesting physical and spectroscopic properties. In this paper, the optical spectroscopy of rare earths doped glasses with a special emphasis on application as white LED were presented. The luminescent glass materials containing Ln³⁺ (Ln = Pr, Tb, Dy) and Ce³⁺ ions were obtained. The glasses samples were prepared by a traditional melt-quenching technique. The optical properties of glasses containing various concentrations of rare earth ions were analyzed. It was observed that luminescence bands corresponding to characteristic transitions of Ln³⁺ and cerium ions are present on spectra measured under direct excitation of Ce³⁺. Therefore, it indicates that the energy transfer process between Ce³⁺ /Pr³⁺, Ce³⁺ /Tb³⁺, Ce³⁺ / Dy³⁺ ions in glasses occurs. Some parameters such as correlated color temperature (CCT) and chromaticity coordinates (CIE) that characterize white LEDs were analyzed and discussed in detail.

Źródło:

Optica Applicata; 2019, 49, 3; 383-391
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Analiza struktury chemicznej hydroksyapatytu wzbogaconego jonami Mn 2+ wygrzewanego w wysokiej temperaturze
Structural characterization of thermally processed hydroxyapatite enriched in Mn2+ ions

Autorzy:

Kolmas, J.
Jabłoński, M.
Ślósarczyk, A.
Kołodziejski, W.

Powiązania:

https://bibliotekanauki.pl/articles/286145.pdf

Data publikacji:

2014

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

hydroksyapatyty
biokompatybilność
apatyt
hydroxyapatite
biocompatibility
ions

Opis:

Syntetyczne hydroksyapatyty (HAs), ze względu na wysoką biokompatybilność z ludzkimi tkankami zmineralizowanymi, są szeroko stosowane jako biomateriały w ortopedii oraz stomatologii. Struktura hydroksyapatytu Ca10(PO4)6(OH)2 pozwala na szereg jonowych podstawień, które mogą zachodzić zarówno w pozycji kationów wapnia jak i ortofosforanów oraz strukturalnych grup hydroksylowych. Wprowadzenie dodatkowych jonów do struktury hydroksyapatytu może wpływać na jego właściwości biologiczne i fizykochemiczne. Mangan jest śladowym pierwiastkiem wchodzącym w skład biologicznego apatytu (mineralnego składnika kości oraz zębów). Odgrywa on kluczową rolę w powstawaniu matrycy organicznej. Dodatkowo indukuje integryny, grupę receptorów umożliwiających adhezję komórek. Ostatnio przeprowadzone badania potwierdziły, że hydroksyapatyt wzbogacony jonami manganu Mn2+ wykazuje łatwiejszą osteointegrację niż czysty hydroksyapatyt, dlatego też może być z powodzeniem stosowany jako pokrycie implantów metalicznych. W powyższej pracy wykorzystano standardową metodę mokrą do syntezy hydroksyapatytów zawierających niewielkie ilości jonów Mn2+. Otrzymane próbki wygrzewano następnie w dwóch różnych temperaturach: 800 oraz 1250°C. Głównym celem tej pracy było zbadanie wpływu procesu termicznego na strukturę chemiczną hydroksyapatytuwzbogaconego jonami manganowymi. Do badań fizykochemicznych wykorzystano: proszkową dyfraktometrię rentgenowską (PXRD), mikroskopię elektronową (SEM oraz TEM), spektroskopię w podczerwieni (FT-IR) oraz spektroskopię magnetycznego rezonansu jądrowego w ciele stałym (ssNMR). Wprowadzenie jonów Mn2+ do struktury hydroksyapatytu zostało potwierdzone dzięki zastosowaniu metod PXRD oraz ssNMR. Wykazano także, że obecność manganu ułatwia termiczny rozkład hydroksyapatytu do oksyhydroksyapatytu. Próbki wygrzewane w wyższej temperaturze (1250°) okazały się niehomogeniczne. Zawierały, oprócz fazy hydroksyapatytu, dodatkowe fazy krystaliczne: oksyhydroksyapatyt, oksyapatyt, dziewięciotlenek dwufosforu i czterowapnia (TTCP) oraz α-ortofosforan wapnia (αTCP). Użyte metody fizykochemiczne pozwoliły stwierdzić, że w próbkach kalcynowanych (wygrzewanych w temperaturze 800°C) jony manganowe zajmują przede wszystkim pozycje wapnia Ca(I) w komórce elementarnej hydroksyapatytu. Podczas wygrzewania w wyższej temperaturze dochodzi do częściowego przemieszczenia jonów manganu w pozycje Ca(II).
Synthetic hydroxyapatites (HAs), due to their high compatibility with human mineralized tissues are widely used in implant materials for orthopaedic and dental applications. Hydroxyapatite structure Ca10(PO4)6(OH)2 is tolerant to several ionic substitutions. They can occur in HA for calcium cations, for orthophosphates and structural hydroxyl ions. The incorporation of additional ions into the apatite crystals may change their biological or physicochemical properties. Manganese appears in biological apatite (bone and teeth) and plays a key role in the development of organic matrix. It also induces integrins, receptors mediating cellular interactions with extracellular matrix and cell surface ligands. Manganese-doped HA exhibits better osseointegration than pure HA, thus it may be used as a coating of metallic implants. In this paper, hydroxyapatites enriched in small amounts of manganese ions Mn2+ were synthesized by standard wet method. The obtained samples were heated at two different temperatures: 800 and 1250ºC. The main aim of this study was to determine the influence of thermal processing of hydroxyapatite enriched in Mn2+ ions on its chemical structure. For profound physicochemical studies powder X-ray diffractometry (PXRD), electron microscopy (SEM and TEM), infrared spectroscopy (FT-IR) and solid-state nuclear magnetic resonance (ssNMR) were applied. The incorporation of manganese ions was confirmed using PXRD and ssNMR methods. It was found that the presence of manganese facilitates hydroxyapatite dehydration and decomposition to oxyhydroxyapatite. The samples heated at 1250ºC are not homogenous and contain, apart from hydroxyapatite other crystalline phases: oxyhydroxyapatite, oxyapatite, tetracalcium phosphate (TTCP) and α-tricalcium phosphate (αTCP). In the calcined sample (heated at 800ºC), manganese ions preferentially occupy the Ca(I) position in the hydroxyapatite crystallographic unit cell. During heat treatment at the higher temperature, some Mn2+ ions move to the Ca(II) position.

Źródło:

Engineering of Biomaterials; 2014, 17, no. 128-129; 10-11
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Reduction of chromium(VI) ions from aqueous solutions by using the solvent impregnated resin

Autorzy:

Wójcik, G.
Hubicki, Z.

Powiązania:

https://bibliotekanauki.pl/articles/115625.pdf

Data publikacji:

2011

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

sorption of chromium(VI) ions
reduction

Opis:

The solvent impregnated resins enables effective recovery of microquantities of chromium(VI) ions from wastewaters. The solvent impregnated resin (SIR) Amberlite XAD 7 HP as polymer matrix has been prepared by the wet-impregnation technique. Aliquat 336 was employed as the extractant and acetone as the solvents for impregnation. Sorption of chromium(VI) was investigated in the batch process . Sorption of chromium(VI) was studied in the pH range from 1.5 to 7. It was stated that sorption of chromium(VI) ions depends on acidity of solution. The values of recovery factors of chromium(VI) are higher at low pH than in neutral solution. The speciation of chromium was investigated in the studied pH range. Reduction of chromium(VI) to chromium(III) under acidic conditions was observed. Chromium was determined by using the spectrophotometric and atomic absorption spectroscopy methods. Both methods permit to observe changing of valence of chromium(III) and (VI) oxidation states. The prepared SIR is a new sorbent used for recovery of chromium ions from wastewaters.

Źródło:

Challenges of Modern Technology; 2011, 2, 3; 41-43
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Production of negative hydrogen ions using a low-pressure reflex discharge source

Autorzy:

Toader, E.

Powiązania:

https://bibliotekanauki.pl/articles/147442.pdf

Data publikacji:

2006

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

magnetized plasma
negative ions
plasma sources

Opis:

In this paper we analyze the possibility to use the reflex discharge plasma as a volume source of negative hydrogen ions. The basic internal parameters like the temperature Te and the density ne of the electrons, the density ni of the positive hydrogen ions, the density n- of the negative hydrogen ions, and the negative ion fraction n-/ne are measured and discussed. The operating conditions are optimized within the pressure range 0.1-10 Pa, the discharge power 20-140 watt, and the magnetic field 0-150 gauss. The experiment shows that the enhanced magnetic ionization is the most effective within the pressure range from 0.7 to 4.0 Pa. When p ť 1 Pa the cold electron temperature Te is 0.77 eV, the cold electron density ne is 4.2 ´ 10 18 m-3 and the negative ion density n- is as high as 0.8 x 10 17 m-3. The negative ion fraction n-/ne increases from 1.4% for p = 0.1 Pa to almost 2.2% within the pressure range 1-4 Pa. The positive ion density scales with the power, while the negative ion density and the negative ion fraction seems to saturate at higher power levels.

Źródło:

Nukleonika; 2006, 51, 1; 29-35
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Supramolecular complexes of cobalt(II), manganese(II) and cadmium(II) with bis(terpyridine) ligand as novel luminescent materials

Autorzy:

Wałęsa-Chorab, M.
Gorczyński, A.
Marcinkowski, D.
Hnatejko, Z.
Patroniak, V.

Powiązania:

https://bibliotekanauki.pl/articles/779935.pdf

Data publikacji:

2013

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

luminescence
supramolecular complexes
transition metal ions

Opis:

Self-assembly of N6-donor bis(terpyridine) ligand L with transition metal ions: Co(II), Mn(II) and Cd(II) leads to a formation of three kinds of supramolecular complexes. In the electronic absorption and emission spectra of supramolecular complexes additional bands were observed what was ascribed to the coordination of ligand molecules to metal ions. Luminescence properties of these complexes strongly depend on the kind of metal ions and counter ions. The effective blue luminescence was observed in the case of Mn(II) and Cd(II) complexes in which all N-donor atoms of ligand molecules coordinate with the metal center.

Źródło:

Polish Journal of Chemical Technology; 2013, 15, 3; 91-95
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Metody usuwania jonów kadmu i ołowiu z roztworów wodnych
Methods of cadmium and lead ions removal from aqueous solutions

Autorzy:

Kasprzyk, P.
Sanak-Rydlewska, S.

Powiązania:

https://bibliotekanauki.pl/articles/394659.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

wymiana jonowa
jony kadmu
jony ołowiu
Purolite C160
ion exchange process
cadmium ions
lead ions

Opis:

W pracy zostaną przedstawione metody eliminacji jonów kadmu i ołowiu z roztworów wodnych. Wśród nich wymiana jonowa staje się coraz popularniejszą metodą usuwania zanieczyszczeń ze ścieków przemysłowych. Za tą metodą przemawiają: prostota procesu, niska energochłonność oraz możliwość selektywnego rozdziału zanieczyszczeń. Wymieniacz jonowy używany w procesie można wielokrotnie stosować, bowiem można go poddawać regeneracji. Stosowanie kolumn jonowymiennych umożliwia także budowę modułową linii technologicznej oczyszczania ścieków oraz szybką wymianę modułów według potrzeb technologicznych i składu ścieków. Wymianę jonową można rozpatrywać jako proces membranowy, gdzie membraną jest powierzchnia ziarna – będąca selektywnie przepuszczalną dla wymienianych jonów. W artykule przedstawiono badania laboratoryjne dotyczące wpływu wybranych parametrów procesu na wydajność wymiany jonowej dla jonów kadmu i ołowiu. Pierwiastki te według polskiego prawodawstwa uznane są za substancje szczególnie szkodliwe i mają działanie kancero- i mutagenne. Najwyższa koncentracja tych pierwiastków występuje na terenach uprzemysłowionych oraz na terenach miejskich. Mogą one pochodzić z przemysłu metalurgicznego, produkcji baterii i akumulatorów, ze spalania paliw kopalnych lub produkcji tworzyw sztucznych. Emisja kadmu i ołowiu do środowiska wodnego odbywa się poprzez odprowadzanie wód kopalnianych czy ścieków z przemysłu hydrometalurgicznego lub z galwanizerni. Badania własne wskazują, że eliminacja jonów Pb i Cd najkorzystniej zachodzi w roztworach o pH około 4 i utrzymuje się na wysokim poziomie w zakresie kwaśnego środowiska. Jonit Purolite C-160 umożliwia osiągnięcie współczynnika wydzielania (X) około 99% dla kadmu – tabela 1, natomiast współczynnik ten dla jonów ołowiu nie przekracza 97% – tabela 2.
This article presents the methods of cadmium and lead ions removal from aqueous solutions. The ion exchange method is becoming a more and more popular method of removing impurities from wastewater. The main advantages of this method are: process simplicity, low energy consumption and the possibility of the selective separation of pollutants. The ion exchanger used in the process could be regenerated, therefore, it could be used repeatedly. The use of ion-exchange columns also allows for the modular construction of the process line and the rapid replacement of modules according to the technological needs and composition of the wastewater. Ion exchange can be seen as a membrane process in which the grain surface acts as a membrane – which is selectively permeable to the exchanged ions. The article presents laboratory studies on the influence of the ion exchange process parameters on the efficiency of cadmium and lead ion exchange. These elements are suspected of carcinogenicity and teratogenicity, and according to Polish Legislation, are considered to be harmful substances. The highest concentration of these elements occurs in industrialized areas and in urban areas. They may come from the hydrometallurgical industry, the production of batteries and accumulators from the burning of fossil fuels and the production of plastics. The emission of cadmium and lead into the aquatic environment is done through the discharge the mine water and wastewater from the hydrometallurgical industry and from electroplating. Experiments show that the elimination of Pb and Cd ions preferably occurs in aqueous solutions with a pH around 4. Ion exchange resin Purolite C-160 allows a removal coefficient (X) in the range of about 99% for cadmium to be achieved – Table 5.1, while the same coefficient for lead ions does not exceed 97% – Table 5.2.

Źródło:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2016, 94; 205-215
2080-0819

Pojawia się w:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:

Generation of ·OH initiated by interaction of Fe2+ and Cu+ with dioxygen; comparison with the Fenton chemistry.

Autorzy:

Urbański, Norbert
Beręsewicz, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1044216.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

superoxide dismutase
autoxidation
catalase
free radical
Fenton reaction
hydroxyl radical
iron ions
copper ions
desferrioxamine

Opis:

Iron and copper toxicity has been presumed to involve the formation of hydroxyl radical (·OH) from H2O2 in the Fenton reaction. The aim of this study was to verify that Fe2+-O2 and Cu+-O2 chemistry is capable of generating ·OH in the quasi physiological environment of Krebs-Henseleit buffer (KH), and to compare the ability of the Fe2+-O2 system and of the Fenton system (Fe2+ + H2O2) to produce ·OH. The addition of Fe2+ and Cu+ (0-20 μM) to KH resulted in a concentration-dependent increase in ·OH formation, as measured by the salicylate method. While Fe3+ and Cu2+ (0-20 μM) did not result in ·OH formation, these ions mediated significant ·OH production in the presence of a number of reducing agents. The ·OH yield from the reaction mediated by Fe2+ was increased by exogenous Fe3+ and Cu2+ and was prevented by the deoxygenation of the buffer and reduced by superoxide dismutase, catalase, and desferrioxamine. Addition of 1 μM, 5 μM or 10 μM Fe2+ to a range of H2O2 concentrations (the Fenton system) resulted in a H2O2-concentration-dependent rise in ·OH formation. For each Fe2+ concentration tested, the ·OH yield doubled when the ratio [H2O2]:[Fe2+] was raised from zero to one. In conclusion: (i) Fe2+-O2 and Cu+-O2 chemistry is capable of promoting ·OH generation in the environment of oxygenated KH, in the absence of pre-existing superoxide and/or H2O2, and possibly through a mechanism initiated by the metal autoxidation; (ii) The process is enhanced by contaminating Fe3+ and Cu2+; (iii) In the presence of reducing agents also Fe3+ and Cu2+ promote the ·OH formation; (iv) Depending on the actual [H2O2]:[Fe2+] ratio, the efficiency of the Fe2+-O2 chemistry to generate ·OH is greater than or, at best, equal to that of the Fe2+-driven Fenton reaction.

Źródło:

Acta Biochimica Polonica; 2000, 47, 4; 951-962
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Bioaccumulation of uranium from waste water using different strains of Saccharomyces cerevisiae

Autorzy:

Tykva, R.
Novák, J.
Podracká, E.
Popa, K.

Powiązania:

https://bibliotekanauki.pl/articles/148088.pdf

Data publikacji:

2009

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

bioaccumulation
uranium
Saccharomyces cerevisiae
competitive ions

Opis:

Five different strains of Saccharomyces cerevisiae were tested for their abilities to accumulate uranium from waste water containing competitive ions. Samples of water passing out from a previous uranium mill were used. The strains tested possess different abilities to accumulate uranium. The kinetics of bioaccumulation, the leaching degree, the influence of cell density and their origin were investigated. Under the applied experimental conditions, more than a half of the total activity (uranium and the decay products) could be accumulated after 60 min contact time of 1 mL S. cerevisiae suspension and 5 mL of water. The other cations present in solution effectively competed for the uranium accumulation. 226Ra and its decay products were completely retained using all tested strains.

Źródło:

Nukleonika; 2009, 54, 2; 143-148
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Electron capture negative ion mass spectra of some freon derivatives

Autorzy:

Asfandiarov, N.
Pshenichnyuk, S.
Fal’ko, V.
Wnorowska, J.
Wnorowski, K.
Szamrej-Foryś, I.

Powiązania:

https://bibliotekanauki.pl/articles/148517.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

negative ions
electron capture
freon derivatives

Opis:

The temperature dependence of dissociative attachment has been investigated in the temperature range 350-575 K for two freon derivatives 1,1,1-C2H3F2Cl and C2F5Cl using Electron Capture Negative Ion Mass Spectra (ECNI MS). The temperature dependence for 1,1,1-C2H3F2Cl is similar to that observed in the case of CF3Cl reported by Illenberger et al. In contrast, C2F5Cl exhibits quite a different spectrum and its temperature behavior. It has been suggested that sigma*C-Cl delocalization onto two empty orbital leads to Cl- ion formation in two different resonance states.

Źródło:

Nukleonika; 2003, 48, 2; 83-88
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:

Determination of the effective diffusivity of cadmium(II) in calcium alginate beads

Autorzy:

Kwiatkowska-Marks, S.
Wójcik, M.
Kopiński, L.

Powiązania:

https://bibliotekanauki.pl/articles/347047.pdf

Data publikacji:

2011

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

cadmium ions
alginate beads
effective diffusivity

Opis:

Effective diffusivity (De) of cadmium compounds was calculated in the beads. The study was carried out using two methods: a shrinking core model (SCM) method and a newly developed method named conductometric. It turned out to be a simple and effective method for the calculation of effective diffusivity of Cd(II) in alginate sorbents. The De values obtained by the two methods depended on the alginate content in the beads. However, SCM, in contrast to the conductometric method, gave De values increasing with increasing alginate levels in the beads and lower than the molecular diffusivity of Cd(II), this being inconsistent with the mechanism of diffusion in porous carriers. Hence, the conductometric method can be considered as one giving more reliable results, compared with the SCM method. Moreover, diffusion retardation coefficients for the alginate beads were calculated. Enhanced content of the biopolymer in the beads caused retardation of Cd(II) diffusion in the beads due to the decreasing calculated retardation coefficients with the increasing alginate contents in the beads.

Źródło:

Ars Separatoria Acta; 2011, 8; 11-23
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:

Effect of divalent metal ions on annexin-mediated aggregation of asolectin liposomes.

Autorzy:

Mel'gunov, Vladimir
Akimova, Elena
Krasavchenko, Kirill

Powiązania:

https://bibliotekanauki.pl/articles/1044309.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

aggregation
liposome
annexin
divalent metal ions

Opis:

Annexins belong to a family of Ca2+- and phospholipid-binding proteins that can mediate the aggregation of granules and vesicles in the presence of Ca2+. We have studied the effects of different divalent metal ions on annexin-mediated aggregation of liposomes using annexins isolated from rabbit liver and large unilamellar vesicles prepared from soybean asolectin II-S. In the course of these studies, we have found that annexin-mediated aggregation of liposomes can be driven by various earth and transition metal ions other than Ca2+. The ability of metal ions to induce annexin-mediated aggregation decreases in the order: Cd2+>Ba2+, Sr2+>Ca2+>>Mn2+>Ni2+>>Co2+. Annexin-mediated aggregation of vesicles is more selective to metal ions than the binding of annexins to membranes. We speculate that not every type of divalent metal ion can induce conformational change sufficient to promote the interaction of annexins either with two opposing membranes or with opposing protein molecules. Relative concentration ratios of metal ions in the intimate environment may be crucial for the functioning of annexins within specialized tissues and after treatment with toxic metal ions.

Źródło:

Acta Biochimica Polonica; 2000, 47, 3; 675-683
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:

Non-destructive viscometric studies of enzymic milk coagulation III. The effect of pH, temperature and Ca-ions concentration on the secondary phase of milk coagulation
Nie niszczące badania wiskozymetryczne enzymatycznego procesu krzepnięcia mleka III. Wpływ stężenia jonów wapniowych, pH i temperatury na wtórną fazę enzymatycznego krzepnięcia mleka

Autorzy:

Bachman, S.
Klimczak, B.
Gasyna, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1398347.pdf

Data publikacji:

1980

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Tematy:

milk coagulation
immobilized rennin
Ca-ions

Opis:

It was observed that within the pH range between 5.57 and 6.37 the time of development of the secondary phase of the rennet milk coagulation is independent from temperatures between 25° and 35°C. Increased concentration of Ca-ions between 0.66 and 1.1 mg CaCl₂ /ml milk accelerates the formation of the secondary phase.
Kontynuując wcześniej prowadzone prace na temat enzymatycznego procesu krzepnięcia mleka [l, 2] w tej części przedstawiono badania wpływu pH oraz stężenia jonów wapniowych we współdziałaniu z temperaturą na wtórną fazę enzymatycznego krzepnięcia mleka. Do badań zastosowano unieruchomioną renninę. Stwierdzono, że dla wartości pH od 5,57 do 6,37 czas wystąpienia fazy wtórnej jest niezależny od temperatury w zakresie 25-35°C. W miarę zwiększenia wartości pH następował spadek szybkości zmiany lepkości mleka w okresie wtórnej fazy. Wyznaczono zależność stałej szybkości zmian lepkości od stężenia jonów wodorowych: k = k'(H+)0,5. Określono zależność odwrotności czasu wystąpienia fazy wtórnej od stężenia jonów wapniowych w granicach 0,66-1,1 mg CaCl₂ /ml mleka dla temperatur w zakresie 25-35°C. Stwierdzono przyspieszenie wystąpienia fazy wtórnej w miarę wzrostu stężenia jonów wapniowych w mleku.

Źródło:

Acta Alimentaria Polonica; 1980, 06, 3; 135-143
0137-1495

Pojawia się w:

Acta Alimentaria Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:

The mechanical aspect of titanium ion release after posterior instrumentation for early onset scoliosis

Autorzy:

Danielewicz, Anna
Fatyga, Marek
Wójciak-Kosior, Magdalena
Sawicki, Jan
Różańska-Boczula, Monika
Sowa, Ireneusz
Latalski, Michał

Powiązania:

https://bibliotekanauki.pl/articles/109528.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

scoliosis
metal ions
implant
titanium
mineralization

Opis:

Surgical treatment of early onset scoliosis (EOS) is connected with the risk of early and late complications. The aim of the study is to assess influence of the rod fracture on the titanium ion release (TIR) in traditional growing rods instrumentation for EOS.56 patients treated surgically due to EOS were divided into three groups: 1) a control-patients newly operated due to scoliosis, patients treated with the traditional growing rod (TGR) and TGR who had rod fracture (FGR) and required a surgical revision. Titanium quantification in blood sample, skin fragment (CT –clean tissue) andmacrosco-pically contaminated tissue located near the implant (DT –dirty tissue) was performed using high-resolution emission spectrometry with excitation in inductively coupled plasma.The mean serum titanium level in control, TGR, and FGR groups were 1.93 ± 0.8, 5.61 ± 0.23, and 4.43 ± 0.1 μg/dm³, respectively. The mean CT titanium level in control, TGR, and FGR groups were 0.0045 ± 0.001, 0.0035 ± 0.001and 0.0065 ± 6.8 mg/g, respectively. The mean DT titanium level in TGR and FGR groups was 0.59 ± 0.02, and 1.022 ± 0.03 mg/g, respectively.Implant leadsto the TIR into tissues and blood. Increasing the number of anchors increases the titanium content inthe CT TGR group. Mechanical damage to the implant has no significant effect on the increase of TIR

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1442-1449
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Study of flotation behavior and mechanism of cervantite activation by copper ions

Autorzy:

Wang, J.
Wang, Y.
Fu, K.
Xu, L.
Wang, Z.
Sun, H.
Xiao, J.

Powiązania:

https://bibliotekanauki.pl/articles/110228.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

flotation
cervantite
copper ions
activation mechanism

Opis:

Copper-ion activation plays a highly important role in cervantite (Sb2O4) flotation. Without metal-ion activation, cervantite cannot be floated by sodium oleate. In this study, flotation tests were conducted to study the effect of Cu2+ on the flotation behaviours of cervantite and quartz (SiO2) as the main gangue mineral. Metal-ion adsorption capacities, zeta potentials, solution chemistry and X-ray photoelectron spectra were analyzed to study the adsorption behavior and mechanism of copper ions and sodium oleate interaction with the minerals surfaces. The results demonstrate that under weakly acidic conditions, cervantite can be flotated and separated from quartz by the addition of copper ions. The reason is that copper ions can be selectively adsorbed on the cervantite surface under weakly acidic conditions, thereby promoting the adsorption of sodium oleate onto the cervantite surface by chemical adsorption. Conversely, copper ions are weakly adsorbed on quartz surfaces below pH 6.1, and sodium oleate cannot be adsorbed on quartz surfaces by chemical adsorption. The hydroxy copper species are integral to the selective activation of cervantite over quartz.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 814-825
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Application of modified maize hull for removal of Cu(II) ions from aqueous solutions

Autorzy:

Ghasemi, S. M.
Mohseni-Bandpei, A.
Ghaderpoori, M.
Fakhri, Y.
Keramati, H.
Taghavi, M.
Moradi, B.
Karimyan, K.

Powiązania:

https://bibliotekanauki.pl/articles/208248.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

heavy metal ions
waste water
Cu(II)
ions
adsorption
biomass
jony metali ciężkich
ścieki
biomasa
adsorpcja

Opis:

Discharge of industrial waste containing heavy metals to the environment is a main concern because of their toxicity to many life forms. Adsorption process is one of the conventional methods in order to adsorb heavy metals from wastewater effluents. Therefore, the removal of Cu(II) from aquatic solutions using modified maize hull was investigated. All experiments were performed in batch conditions. The residual Cu(II) concentration was measured by AAS. Upon increasing the adsorbent dosage, pH, and contact time and decreasing Cu(II) concentration, the removal efficiency of Cu(II) ions increased. In optimum conditions, 50% of copper was removed by modified maize hull. The experimental data were best fitted by the Langmuir type 2 model and the adsorption kinetic model followed a pseudo-second order type 1 model. It seems that the use of the modified maize hull to remove Cu(II) ions is very suitable, low-cost, and efficient.

Źródło:

Environment Protection Engineering; 2017, 43, 4; 93-103
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Removal of Zinc Ions from Aqueous Solutions with the Use of Lignin and Biomass. Part II

Autorzy:

Miros-Kudra, P.
Sobczak, P.
Gzyra-Jagieła, K.
Ciepliński, M.

Powiązania:

https://bibliotekanauki.pl/articles/24200965.pdf

Data publikacji:

2023

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

lignin
sorption
biomass
zinc ions
water treatment

Opis:

In response to the trend toward sustainable management of by-products from the pulp and paper industry as well as plant waste, practical and economical methods are being developed to use them in a way that does not pose a threat to the environment. The main aim of the research was to study the possibility of using lignin and plant biomass as biosorbents for the removal of zinc ions from aqueous solutions. The secondary aim was to build an optimal multilayer system made of biosorbents selected during the research in order to obtain the highest sorption efficiency and to determine the best conditions of the sorption process. The effectiveness of zinc ion sorption was assessed using an appropriate combination of sorbents such as lignin, oat bran, rice husk, chitosan, pectin, sodium alginate, pine bark, coconut fiber and activated carbon, selected on the basis of literature data and the preliminary results of tests carried out using FTIR and AAS. The main component of the sorption system was lignin separated from black liquor. Results indicate that the best Zn sorption system was based on coconut fiber, lignin, and pine bark, for which the maximum sorption efficiency was 95%. The research also showed that the increase in the process temperature, the mass of biosorbents used and the alkaline pH are the factors that increase the efficiency of the sorption. It can be concluded that lignin and plant biomass can be used as ecological sorbents of zinc ions from water solutions. They are safe for the environment, produced from renewable sources, and are by-products or waste materials, which is part of the sustainable development and circular economy currently promoted in the EU.

Źródło:

Fibres & Textiles in Eastern Europe; 2023, 31, 2; 11--25
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Poly(2-acrylamido-2-methyl-1-propane sulfonic acid-co-1-vinyl-2-pyrrolidone) Hydrogel and its use in the Removal of Cd(II), Pb(II) and Cu(II)

Autorzy:

Çavuş, S.
Çakal, E.

Powiązania:

https://bibliotekanauki.pl/articles/1031592.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

sorption
heavy metal ions
hydrogels
sulfonic acid

Opis:

Poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-1-vinyl-2-pyrrolidone), P(AMPS-co-VP), hydrogel was prepared by free radical cross-linking polymerization method. Prepared hydrogel was used in the competitive removal of Cd(II), Pb(II) and Cu(II) ions from aqueous solution. The characterization of P(AMPS-co-VP) before and after sorption was carried out by the Fourier transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. Atomic absorption spectrometer was used to found the concentration of metal ions in the aqueous solution. The selectivity of P(AMPS-co-VP) was as follows: Cd(II)>Pb(II)>Cu(II). Kinetic study showed that competitive removal of heavy metal ions on poly(AMPS-co-VP) was in accordance with a pseudo-second-order model.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 505-508
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Study of Gold, Copper and Nickel Adsorption, from their Acidic Chloride Solutions, Onto Activated Carbon

Autorzy:

Wojnicki, M.
Socha, R. P.
Luty-Błocho, M.
Partyka, B.
Polański, M.
Deszcz, P.
Kołczyk, K.
Żabiński, P.

Powiązania:

https://bibliotekanauki.pl/articles/356223.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adsorption
gold(III) chloride ions
recovery
recycling

Opis:

In this paper, a simple and effective method for gold recovery is described. The paper describes a way to recover gold onto activated carbon from a synthetic solution of gold(III) chloride. The method can also be used on nickel(II) as well as copper(II) chloride of where the metal ion ratios are comparable to the metal ratios found in some electronic waste. With the use of activated carbon in the process of electrolyte purification it is possible to selectively remove gold in metallic form from the solution. XPS studies have confirmed that metallic gold is present on the carbon surface. A spectrophotometric method was used to determine the concentration of Au(III) in the solution. Different concentration of nickel(II) as well as copper(II) were investigated. In all cases, adsorption and reduction of Au(III) to the metallic form was observed.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 73-81
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Selected methods of electronand ion-diagnostics in tokamak scrape-off-layer

Autorzy:

Sadowski, M. J.

Powiązania:

https://bibliotekanauki.pl/articles/146123.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

diagnostics
electrons
ions
fusion products
probes
tokamak

Opis:

This invited paper considers reasons why exact measurements of fast electron and ion losses in tokamaks, and particularly i n a scrape-off-layer and near a divertor region, are necessary in order to master nuclear fusion energy production. Attention is also paid to direct measurements of escaping fusion products from D-D and D-T reactions, and in particular of fast alphas which might be used for plasma heating. The second part describes the generation of so-called runaway and ripple-born electrons which might induce high energy losses and cause severe damages of internal walls in fusion facilities. Advantages and disadvantages of different diagnostic methods applied for studies of such fast electrons are discussed. Particular attention is paid to development of a direct measuring technique based on the Cherenkov effect which might be induced by fast electrons in appropriate radiators. There are presented various versions of Cherenkov-type probes which have been developed by the NCBJ team and applied in different tokamak experiments. The third part is devoted to direct measurements of fast ions (including those produced by the nuclear fusion reactions) which can escape from a high-temperature plasma region. Investigation of fast fusion-produced protons from tokamak discharges is reported. New ion probes, which were developed by the NCBJ team, are also presented. For the fi rst time there is given a detailed description of an ion pinhole camera, which enables irradiation of several nuclear track detectors during a single tokamak discharge, and a miniature Thomson-type mass-spectrometer, which can be used for ion measurements at plasma borders.

Źródło:

Nukleonika; 2015, 60, 2; 199-206
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Position of Fe ions in MgO crystalline structure

Autorzy:

Szczerba, J.
Prorok, R.
Stoch, P.
Śnieżek, E.
Jastrzębska, I.

Powiązania:

https://bibliotekanauki.pl/articles/146372.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

Mössbauer spectroscopy
MgO
Fe ions
crystal structure

Opis:

Magnesium oxide (MgO) is one of the most important raw materials in many branches of industry. Magnesium oxide is a popular refractory raw material because of its high refractoriness and high resistance to basic slags and environment. In many cases, use of MgO is limited by its properties, especially the presence of secondary phases like iron oxides. The amount and distribution of iron oxides can strongly infl uence the technological properties of MgO and depend on the manufacturing method, particularly the heat-treatment process. The aim of the study was to evaluate the infl uence of the heat-treatment process on amount and distribution of iron ions in a magnesium oxide lattice. The 57Fe Mössbauer effect measurements of fused and sintered magnesium oxide samples doped by the iron oxide were conducted. Investigation reveals in both cases the presence of Fe2+ as well as Fe3+ ions. Fe2+ ions occupy Mg2+ octahedral sites in the MgO lattice, whereas the Fe3+ ions are located in highly distorted octahedral coordination. The amount of Fe2+ varies from around 66% for fused samples to 30% for sintered samples.

Źródło:

Nukleonika; 2015, 60, 1; 143-145
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Phase-locking of 19-core Yb3+ - doped optical fibre

Autorzy:

Kochanowicz, M.
Dorosz, D.
Zając, A.

Powiązania:

https://bibliotekanauki.pl/articles/200141.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

multicore optical fibre
fibre lasers
ytterbium ions

Opis:

The supermode generation in a multicore optical fibre laser can be realised by phase-locking of radiation inside of the fibre. The model proposed by authors implies the achievement of supermode generation by exchanging radiation between the cores during the development of the laser action. The analysis of the impact of coupling value between the cores on phase radiation of particular emitters was considered. In the paper the phase-locking of 19-core optical fibre doped with Yb3+ ions is presented. The analysis of material and geometrical parameters of the active 19 -core optical fibre and phase deviation on the beam quality factor of the laser beam in the far-field diffraction region has been analysed. The beam quality factor of the manufactured multicore fibre equals BQF = 0.71, V = 2.4, d = 18 ěm. As a result of the conducted analysis a double-clad 19 – cores optical fibre doped with ytterbium ions has been designed and fabricated and its luminescence spectra and far-field diffraction pattern have been measured. Registered in the experiment in MOFPA system far-field pattern showed centrally located peak of relatively high radiation intensity together with smaller side-lobes, and as such was similar to the pattern which had been obtained numerically.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 371-379
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Influence of active admixtures onto tellurite glass refractive index

Autorzy:

Reben, M.
Wasylak, J.
Jaglarz, J.

Powiązania:

https://bibliotekanauki.pl/articles/200746.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

tellurite glass
rare earth ions
refractive index

Opis:

The goal of this work was to investigate the influence of rare earth ions such as Tm3+, Yb3+ on physico-chemical properies of tellurite glass from the TeO2-WO3-PbO-PbF2-Na2O system. The thermal characteristic of tellurite glass Tm3+, Yb3+ doped have been presented. The effect of the glass crystallization on thermal stability of the glass and crystallizing phases formed upon heat treatment were investigated by DTA/DSC/, XRD methods. The spectral dependence of ellipsometric angles of the tellurite glass samples, have been studied. The influence of ions of rare earth elements, i.e. Tm 3+ and Yb3+, onto changes of refractive index of glass P1 (without RE admixture) were examined. The optical measurements were conducted on Woollam M2000 spectroscopic ellipsometer, in spectral range of 190–1700 nm.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 519-522
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Adsorption behavior of calcium ions and its effect on cassiterite flotation

Autorzy:

Chen, Yumeng
Feng, Dongxia
Tong, Xiong

Powiązania:

https://bibliotekanauki.pl/articles/110731.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

cassiterite
calcium ions
adsorption
flotation
salicylhydroxamic acid

Opis:

Naturally, most of the cassiterite co-exists with sparingly soluble calcite, which makes it difficult to be fully utilized. Due to the adsorption of calcium ions dissolved from calcite, surface properties of cassiterite and its floatability can be influenced. Adsorption tests show calcium ions can adsorb on cassiterite surface. In the presence of Ca2+, the zeta potentials of cassiterite shift to more positive values and the isoelectric point of cassiterite increases from pH 4.4 to pH 4.9. XPS results show that after calcium ions treatment, a strong calcium spectral peak at 347.65 eV is detected on the cassiterite surface and the chemical circumstance of oxygen atoms is changed. The presence of Ca2+ can significantly depressed the flotation behavior of cassiterite with salicylhydroxamic acid (SHA) as collector. Its recovery is decreased by 26.03% compared to that without Ca2+ at SHA dosage of 8.0×10-4 mol/dm3. When increasing SHA concentration to 9.0×10-4 mol/dm3 and above, the depression effect is partly compensated and the recovery rises by about 20%. Contact angle values of cassiterite measured by the bubble method correspond well to the flotation performance. Hence the depression mechanism of Ca2+ in cassiterite flotation can be interpreted in two aspects: 1) the consumption of SHA due to complexation reactions in pulp; 2) a decrease of effective adsorption site for SHA on cassiterite because of the adsorption of Ca2+.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 258-267
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Influence and mechanism of Zn2+ on fluorite/calcite in sodium hexametaphosphate flotation system

Autorzy:

Ruitao, Liu
Dan, Liu
Ruofan, Sun
Daqian, Wang
Wenkang, Zhang
Yuebing, Liu
Shuming, Wen

Powiązania:

https://bibliotekanauki.pl/articles/2175451.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fluorite
calcite
sodium hexametaphosphate
flotation
metal ions

Opis:

Fluorite and calcite have similar surface properties and natural floatability, so their flotation separation has always been a problem faced by the beneficiation industry. The key to flotation separation is the choice of depressants. Sodium hexametaphosphate (SHMP) has a good effect on fluorite calcite selective inhibition. In this paper, the effects of Zn2+ on the selective inhibition of SHMP in the flotation process of fluorite and calcite were studied through single mineral and artificial mixed mineral flotation experiments. Solution chemical calculation, X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared spectroscopy (FT-IR) and Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) analyses investigated the mechanism of action of Zn2+, which had the most significant negative effect on the selective inhibition of SHMP. The results show that the main components of SHMP inhibiting minerals are HPO42- and H2PO4-, which can react with Ca active sites on the mineral surface to form hydrophilic Ca(H22PO4)2 and CaHPO4, while Zn2+ The presence of HPO42- in solution resulted in the formation of stable ZnHPO4 complexes, thereby weakening the inhibitory effect of SHMP on minerals.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 151676
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Wyznaczanie współczynnika dyfuzji chlorków w betonie na podstawie badań migracji jonów w polu elektrycznym
Determination of the diffusion coefficient of chlorides in concrete based on tests of the migration of ions in an electric field

Autorzy:

Szweda, Z.
Zybura, A.

Powiązania:

https://bibliotekanauki.pl/articles/163453.pdf

Data publikacji:

2012

Wydawca:

Polski Związek Inżynierów i Techników Budownictwa

Tematy:

beton
korozja chlorkowa
migracja jonów chlorkowych
współczynnik dyfuzji chlorków
badanie w polu elektrycznym
concrete
chloride ions corrosion
chloride ions migration
chloride ions diffusion coefficient
testing in electric field

Opis:

Na podstawie uzyskanego eksperymentalnie pod wpływem sił pola elektrycznego rozkładu stężenia chlorków w betonie oraz rozwiązania teoretycznego, wyznaczono wartości współczynników dyfuzji. Wartości te zweryfikowano, porównując obliczony rozkład chlorków z uzyskanym w badaniach dyfuzyjnych.
Based on a distribution of chloride concentration in concrete, obtained experimentally under the forces of an electrical field, as well as theoretical considerations, values of diffusion coefficients were determined. These values were verified by comparing the calculated chloride distribution with that obtained in diffusion tests.

Źródło:

Przegląd Budowlany; 2012, R. 83, nr 6, 6; 60-62
0033-2038

Pojawia się w:

Przegląd Budowlany

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Signalling: basics and evolution.

Autorzy:

Williams, Robert

Powiązania:

https://bibliotekanauki.pl/articles/1043264.pdf

Data publikacji:

2004

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

pumps
signalling
metal ions
receptors
donors
substrates

Opis:

Signalling concerns the transfer of information from one body, a source, to another, a receiver in order to stimulate activity. The problem arises with the word information. It is defined as what is transferred in a sequence of things, say between people, e.g. words or signs. The idea of signalling between people is then obvious but it is not clear in cell biology. Information transfer, signalling, is required for the organisation of all cellular activity but we must ask what is transferred and how is it transmitted and received? Sometimes it is assumed that all information, i.e. organisation in a cell, is represented in the DNA sequence. This is incorrect. We shall show that the environment is a second source of information concerning material and energy. The receiving party from both DNA and the environment is general metabolism. The metabolism then signals back and sends information to both DNA and uptake from the environment. Even then energy is needed with machinery to send out all signals. This paper examines the way signalling evolved from prokaryotes through to man. In this process the environmental information received increased to the extent that finally the brain is a phenotypic as much as a genotypic organ within a whole organism. By phenotypic we mean it is organised by and interactive with information from the environment.

Źródło:

Acta Biochimica Polonica; 2004, 51, 2; 281-298
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Soft Ion Divalent Metals toward Adsorption on Zn/Al-POM Layered Double Hydroxide

Autorzy:

Silaen, Luna
Elfita, -
Mohadi, Risfidian
Normah, -
Juleanti, Novie
Palapa, Neza Rahayu
Lesbani, Aldes

Powiązania:

https://bibliotekanauki.pl/articles/2027762.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

soft divalent metal ions
adsorption
polyoxometalate
regeneration

Opis:

Development of Zn/Al layered double hydroxide by intercalation using polyoxometalate (POM) $K_4 [α-SiW_12O_40]$ to Zn/Al-POM was investigated. The success of the modification is evidenced by the XRD, FT-IR, and BET characterization data. XRD characterization showed an increase in the interlayer distance from 8.59 Å in Zn/Al LDHs to 10.26 Å in Zn/Al-POM. This success is also supported by the FT-IR data with the appearance of vibrations around $779–979 cm^{-1}$ which indicates the vibration of the polyoxometalate compound in Zn/Al-POM. Other supporting data in the form of BET also prove an increase in surface area from 1.968 $m^2$/g in Zn/Al LDHs to 14.042 $m^2$/g Zn/Al-POM. The ability of Zn/Al-POM as an adsorbent is proven through several parameters such as kinetics, isotherm, thermodynamics, and regeneration for $Cd^{2+}$, $Pb^{2+}$, $Ni^{2+}$, and $Co^{2+}$. Adsorption kinetics showed that Zn/Al-POM was more likely to follow the pseudo-second-order adsorption kinetics model for $Cd^{2+}$, $Pb^{2+}$, $Ni^{2+}$, and $Co^{2+}$. The results of determining the adsorption isotherm parameters of Zn/Al-POM tend to follow the Freundlich isotherm model with a maximum adsorption capacity of 74.13 mg/g on $Pb^{2+}$. The regeneration process showed that Zn/Al-POM was more resistant than Zn/Al LDHs up to 3 cycles. It was proven that Zn/Al-POM was able to survive in the last cycle up to 69.19% on $Ni^{2+}$.

Źródło:

Journal of Ecological Engineering; 2021, 22, 10; 109-120
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

The use of ion exchangers for removing cobalt and nickel ions from water solutions
Wykorzystanie wymieniaczy jonowych do usuwania jonów kobaltu i niklu z roztworów wodnych

Autorzy:

Bożęcka, A. M.
Sanak-Rydlewska, S.

Powiązania:

https://bibliotekanauki.pl/articles/219593.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

żywice jonowymienne
jony kobaltu i niklu
kinetyka wymiany jonowej
ion exchange resins
cobalt ions
nickel ions
ion exchange kinetics

Opis:

The paper presents results of research on cobalt and nickel ions removal from monocomponent solutions using Purolite ion exchange resins. It has been shown that C 160 ion exchange resin has the best sorption properties for both ions (Qe - 72.5 mg Co/g and 88.2 mg Ni/g). Regeneration process of this ion exchanger has high efficiency, achieving about 93% for cobalt ions and about 84% in case of nickel ions. It has been shown that the use of ion exchange method with suitable ion exchange resins guarantees effective removal of cobalt and nickel ions from solutions with very high concentrations corresponding to contents of these metals in industrial wastewaters (e.g. galvanic). In case of C 160 ion exchange resin, after the sorption process is carried out in one 50 minute cycle, the cobalt concentration decreased from about 30 000 mg/L to about 9 500 mg/L (approx. 68%), whereas nickel concentration reached about 6 300 mg/L (approx. 79%). Studied chelating resins don’t have such high sorption capacities. In their case, it is required to convert cobalt and nickel ions into complex forms. The kinetics of studied processes were described by pseudo-second order equations.
Rozwój przemysłu znacznie wpływa na stan środowiska naturalnego. Zanieczyszczenia emitowane do wód, gleb i powietrza na skutek działalności człowieka stanową zagrożenie dla zdrowia i życia organizmów żywych. Wśród tych substancji, jako szczególnie niebezpieczne wymienia się metale toksyczne. W ich grupie znajduje się również kobalt i nikiel, których głównym źródeł emisji do środowiska jest przemysł elektrochemiczny i metalurgiczny. Pierwiastki te są stosunkowo rzadkimi i cennymi metalami, dlatego ważne jest poszukiwanie dodatkowych źródeł i metod ich odzysku. Przedmiotem badań były żywice jonowymienne firmy Purolite, które zastosowano do usuwania jonów kobaltu i niklu z roztworów monoskładnikowych o stężeniach odpowiadających zawartościom tych metali w ściekach galwanicznych (ok. 30 000 mg/dm3). W oparciu o wyniki badań można stwierdzić, że najlepsze właściwości sorpcyjne zarówno w stosunku do jonów kobaltu jak i niklu wykazuje kationit C 160. Zdolności sorpcyjne pozostałych jonitów maleją w szeregu S 950 > S 930 > S 910 > S 920. W kolejnym etapie sprawdzono możliwość regeneracji badanych jonitów za pomocą 10% roztworów kwasu azotowego(V) lub kwasu solnego. Proces regeneracji jonów kobaltu zachodzi z większą wydajnością w porównaniu do jonów niklu. Wykazano, że metodą wymiany jonowej z użyciem odpowiednich żywic jonowymiennych można skutecznie usuwać jony kobaltu i niklu z roztworów o bardzo wysokich stężeniach, odpowiadających zawartościom tych metali w ściekach przemysłowych (m.in. galwanicznych). W przypadku jonitu C 160, po procesie sorpcji wykonanym w jednym, 50 minutowym cyklu, stężenie kobaltu obniżyło się z ok. 30 000 mg/dm3 do wartości ok. 9500 mg/dm3 (ok. 68%), natomiast stężenie niklu osiągnęło wartość ok. 6300 mg/dm3 (ok. 79%) (Tab. 2 i 3). Badane jonity chelatujące nie osiągają tak wysokich pojemności sorpcyjnych. W ich przypadku wymagane jest przeprowadzenie jonów kobaltu i niklu w formy kompleksowe.

Źródło:

Archives of Mining Sciences; 2018, 63, 3; 633-646
0860-7001

Pojawia się w:

Archives of Mining Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Analiza regresji izoterm sorpcji jonów miedzi i kadmu na iłach smektytowych
Regression analysis for the sorption isotherms of copper and cadmium ions on smectite clays

Autorzy:

Kyzioł-Komosińska, J.
Pająk, M.

Powiązania:

https://bibliotekanauki.pl/articles/2062911.pdf

Data publikacji:

2009

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

sorpcja
analiza regresji
jony kadmu
jony miedzi
iły smektytowe
sorption
regression analysis
cadmium ions
copper ions
smectite clays

Opis:

Przeprowadzono badania sorpcji jonów Cd(II) i Cu(II) na cząstkach iłu smektytowego. Do interpretacji wyników zastosowano izotermę Langmuira i Freundlicha. Parametry w równaniach oszacowano stosując metodę regresji liniowej i nieliniowej oraz metodę regresji liniowej dla dwóch zakresów stężeń początkowych jonów metali w roztworze. Najlepsze wyniki osiągnięto stosując metodę regresji nieliniowej lub metodę regresji liniowej dla dwóch zakresów stężeń początkowych jonów metali.
The sorption of Cd(II) and Cu(II) ions onto smectite clays was studied. Equilibrium isotherms were analyzed using the Langmuir and Freundlich isotherms. A comparison between a linear and non-linear method of estimating the isotherm parameters was made. The results show that the non-linear and linear methods in two ranges of initial metal concentrations could be the best way to obtain the parameters.

Źródło:

Biuletyn Państwowego Instytutu Geologicznego; 2009, 436, z. 9/2; 309-316
0867-6143

Pojawia się w:

Biuletyn Państwowego Instytutu Geologicznego

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:

Activation of quartz flotation by Cu2+, Ni2+ in the sodium ethylxanthogenate (EX) system

Autorzy:

Liu, Yang
Tong, Xiong
Xie, Rui-Qi
Xie, Xian
Song, Qiang
Fan, Pei-Qiang

Powiązania:

https://bibliotekanauki.pl/articles/24085981.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

quartz
flotation
ions activation
sodium ethylxanthogenate
adsorption mechanism

Opis:

During the flotation of metal sulfide minerals, due to the interference of unavoidable ions, the quartz also partially floats in some cases. The studies on the mechanism of quartz being activated and floating up are still insufficient. In this study, the influence of the Cu2+ and Ni2+ unavoidable ions on the floatation of quartz was studied by micro-flotation experiments, adsorption detection, zeta potential measurement, solution composition calculation, infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses, and atomic force microscopy (AFM) observation. This provides a theoretical reference for further understanding the mechanism of sodium ethylxanthogenate and quartz surface, as well as the development of a new quartz depressant. The results of flotation showed that after activation by Cu2+ (1×10-4 mol/dm3) and Ni2+ (5×10-5 mol/dm3), the quartz was captured by sodium ethylxanthogenate (EX: 1.4×10-4 mol/dm3) under alkaline conditions (pH=10), while the best recoveries were obtained as 80% and 43%, respectively. The results of adsorption and zeta potential measurements showed that the precipitation rate of Cu2+ was greater than that of Ni2+ under alkaline conditions. Additionally, both Cu2+ and Ni2+ electrostatically adsorbed on the quartz surface and changed the zeta potential of quartz. The solution composition calculation further showed that Cu(OH)+, Cu(OH)2(s), and Ni(OH)+, Ni(OH)2(s) were the main components in the solution under alkaline conditions. The FT-IR and XPS analyses and AFM observations demonstrated that Cu and Ni species adsorbed on O atoms on the quartz surface, providing active sites for EX adsorption, and EX combines with Cu and Ni species on the quartz surface to generate -O-Cu-EX and -O-Ni-EX complexes. Finally, the quartz floated up due to the formation of hydrophobic products and firm adsorption.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166368
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Influence of Fluoride Ions in Artificial Saliva Solution to Corrosion Behavior of Ti-6Al-4V and Ti-10Mo-4Zr Titanium Alloys

Autorzy:

Loch, J.
Krawiec, H.

Powiązania:

https://bibliotekanauki.pl/articles/106985.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

titanium alloys
artificial saliva solution
fluoride ions
corrosion

Opis:

Titanium alloys used in medical applications (especially dentistry) are exposed to the actions of various compounds that appear periodically in the mouth. Fluorine compounds are dangerous for the surface of titanium alloys, because they generate a dissolution of the passive layer. In this way, they destroy the surface of dental implants and cause the absorption of metal ions into the human body. The presented work was aimed to describe the effect of fluoride ions on the corrosive behavior of the commercial Ti-6Al-4V and new Ti-10Mo-4Zr alloys that can be used in stomatology. Electrochemical measurements such as open circuit potential (OCP), linear sweet voltamperometry (LSV) and impedance spectroscopy (EIS) were performed to get information on the corrosive behavior of titanium in artificial saliva solutions (MAS) with different concentrations of NaF. It has been revealed that a high concentration of fluoride ions enhance the current density in the anodic domain, especially for the Ti-10Mo-4Zr alloy. EIS measurements performed at a potential of 0.5 V vs. AgCl (3 M KCl) show that the Ti-10Mo-4Zr alloy has a typical two-layer structure of its passive film. This passive film consists of the outer and inner layers, respectively. The resistance of the outer layer is significantly lower than the resistance of the inner layer.

Źródło:

Journal of Casting & Materials Engineering; 2018, 2, 3; 57-62
2543-9901

Pojawia się w:

Journal of Casting & Materials Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Hydroksyapatyt modyfikowany jonami selenianowymi (IV) – nowy materiał o potencjalnym znaczeniu biomedycznym
Hydroxyapatite doped with selenite ions – a new material for potential biomedical applications

Autorzy:

Kolmas, J.
Olędzka, E.
Sobczak, M.
Nałęcz-Jawecki, G.

Powiązania:

https://bibliotekanauki.pl/articles/284754.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

hydroksyapatyty
jony selenianowe
biomateriały
hydroxyapatite
selenite ions
biomaterials

Źródło:

Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 10-11
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Magnetic system of the heavy ion cyclotron for track membranes production

Autorzy:

Alenitsky, Y.
Zaplatin, N.
Onischenko, L.
Samsonov, E.
Chesnov, A.

Powiązania:

https://bibliotekanauki.pl/articles/148719.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

cyclotron
magnetic system
sector shim
heavy ions beam

Opis:

A heavy ion fixed energy cyclotron based on a conventional magnet with a pole diameter of 1.6 m is designed and constructed in JINR. Ions with A/Z = 5 are accelerated up to the energy E = 2.4 MeV/nucleon. The isochronous magnetic field is formed by four pairs of sector shims. The beam phase shift in formed field is less than š15°RF, and the first harmonic of magnetic field is less than 3 G for all radii of the beam acceleration. Power consumption of magnet is 25 kW. The ECR source with an intensity of 3.5 × 1012 ions/s is used as an ion source. The extracted beam (~1011 ions/s) is intended for the track membrane production.

Źródło:

Nukleonika; 2003, 48,suppl.2; 55-57
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

XAFS in the tracking of reactions in aqueous solution: a case of redox reaction between [AuCl4]- complex ions and ethanol
Metoda XAFS w badaniach reakcji zachodzących w roztworach wodnych: przykład reakcji redoks pomiędzy jonami kompleksowymi [AuCl4]- i alkoholem etylowym

Autorzy:

Pacławski, K.
Sikora, M.

Powiązania:

https://bibliotekanauki.pl/articles/355830.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

XAFS
XANES
redox reaction
gold complex ions
ethanol

Opis:

In this work the potential application of synchrotron radiation in the studies of reaction kinetics in aqueous phase were presented. After short introduction describing principles of technique and potential application of XAFS for the structural studies of reacting species, the experimental results of kinetic measurements of reaction between gold(III) chloride complex ions and ethanol were presented. Analyzing the changes of absorption intensity in the XANES spectra registered at Au-L &sub3; edge during the reaction, the change of the valence state of Au central atom (form 3+to 0) of reacting complex ion was determined. Moreover, empirical XANES data gave the chance to register the kinetic curve and to determine the rate constant of the studied reaction. It was found that reaction is relatively slow (second-order rate constant k = 3.66 · 10 &sup-5; M ;sup-1;s) and lead to the gold metallic phase formation in the system. Applying the continuous-flow method, within the first 600 ms of reaction the changes in XANES spectra were registered. From the obtained results, supported with numerical calculations, two intermediate forms of adducts appearing prior the electron transfer were suggested. It was concluded that when the classic methods, e.g. UV-Vis spectrophotometry, cannot be applied to studies of kinetics of reactions in aqueous solution, the XAFS technique can be a valuable and substitutive (or supplementary) tool for such measurements.
W pracy przedstawiono potencjalne możliwości zastosowania promieniowania synchrotronowego w badaniach nad kinetyka reakcji przebiegających w roztworach wodnych. We wstępie, omówiono podstawy techniki rentgenowskiej analizy struktury nadsubtelnej (XAFS) i jej możliwości zastosowania w badaniach strukturalnych związków chemicznych w fazie ciekłej. Zaprezentowano również dane eksperymentalne z pomiarów XAFS dotyczące kinetyki reakcji pomiędzy chlorkowymi kompleksami złota(III) i alkoholem etylowym. Z analizy zmian intensywności absorpcji widm XANES rejestrowanych przy krawędzi L &sub3; złota określono zmianę stopnia utlenienia atomu centralnego Au (z 3+ do 0) reagującego kompleksu. Ponadto, dane empiryczne pozwoliły na wyznaczenie krzywej kinetycznej oraz określenie drugorzędowej wartości stałej szybkości reakcji (k = 3.66 ·10 &sup-5; M &sup-1;s). W wyniku analizy widm XANES potwierdzono powstawanie faza metalicznej złota w układzie. Stosując metodę ciągłego przepływu reagentów, zarejestrowano zmiany w widmie XANES w ciągu 600 ms od rozpoczęcia reakcji.Na podstawie zarejestrowanych widm oraz przeprowadzonych obliczeń numerycznych zasugerowano dwie możliwe struktury adduktu tworzącego się przed właściwym transferem elektronu w reakcji redoks. Z przeprowadzonych eksperymentów wynika, ze w układach, w których nie jest możliwe stosowanie spektrofotometrii UV-Vis, metoda XAFS może być zastępczym i obiecującym narzędziem do badań kinetyki reakcji.

Źródło:

Archives of Metallurgy and Materials; 2012, 57, 4; 1011-1020
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:

Studies on the production of glucose isomerase by Bacillus licheniformis

Autorzy:

Nwokoro, O.

Powiązania:

https://bibliotekanauki.pl/articles/778827.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

glucose isomerase
carbon sources
nitrogen sources
metal ions

Opis:

This work reports the effects of some culture conditions on the production of glucose isomerase by Bacillus licheniformis. The bacterium was selected based on the release of 3.62 mg/mL fructose from the fermentation of glucose. Enzyme was produced using a variety of carbon substrates but the highest enzyme activity was detected in a medium containing 0.5% xylose and 1% glycerol (specific activity = 6.88 U/mg protein). Media containing only xylose or glucose gave lower enzyme productivies (specific activities= 4.60 and 2.35 U/mg protein respectively). The effects of nitrogen substrates on glucose isomerase production showed that yeast extract supported maximum enzyme activity (specific activity = 5.24 U/mg protein). Lowest enzyme activity was observed with sodium trioxonitrate (specific activity = 2.44 U/mg protein). In general, organic nitrogen substrates supported higher enzyme productivity than inorganic nitrogen substrates. Best enzyme activity was observed in the presence of Mg2+ (specific activity = 6.85 U/mg protein) while Hg2+ was inhibitory (specific activity = 1.02 U/mg protein). The optimum pH for best enzyme activity was 6.0 while optimum temperature for enzyme production was 50oC.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 3; 84-88
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

DFT and TOF-SIMS study of the interaction between hydrogen sulfide ion and malachite (–201) surface

Autorzy:

Mao, Yingbo
Wu, Dandan
Huang, Lingyun

Powiązania:

https://bibliotekanauki.pl/articles/1447053.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

malachite
hydrogen sulfide ions
sulfidation
DFT
TOF-SIMS

Opis:

In this paper, the mechanism of interaction between hydrogen sulfide ions and malachite was investigated using density functional theory (DFT) calculations and time of flight secondary ion mass spectrometry (TOF-SIMS). The DFT calculations showed that HS− adsorption on the malachite (−201) surface was stronger than that of S adsorption resulting from the higher number of electron transfers in the solution which accelerated the sulfidation reaction rate. Density of states (DOS) analysis showed that the near Fermi level was jointly contributed to by the Cu 3d, O 2p, O 2S, and S 3P orbits after adsorption of HS− on the malachite (–201)surface. It was found that the 2p orbital of O and the 3p orbital of S overlapped, indicating that S not only reacted with Cu, but also with O. The TOF-SIMS detected S− and CuS2− fragment ion peaks in the 0−150 m/z negative segment of mass spectra. TOF-SIMS also showed that copper sulfide films of certain thicknesses were formed, demonstrating the effectiveness of hydrogen sulfide sulfidation in flotation processes.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 5; 71-79
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Wpływ zjonizowanego powietrza na organizm ludzki
Impact of ionized air upon human body

Autorzy:

Moga, M.
Małecka, I.

Powiązania:

https://bibliotekanauki.pl/articles/407560.pdf

Data publikacji:

2011

Wydawca:

Instytut Badawczo-Rozwojowy Inżynierii Lądowej i Wodnej Euroexbud

Tematy:

jony ujemne
jony dodatnie
organizm ludzki
zagrożenia mikrobiologiczne
dezynfekcja powietrza
negative ions
positive ions
human body
microbiological hazards
air disinfection

Opis:

Wpływ zjonizowanego powietrza na organizm ludzki zależy od wielkości jonów i ich biegunowości oraz koncentracji ich w powietrzu, a także od właściwości fizykochemicznych nośników jonów (aerozole, bakterie). Głównym źródłem energii jonizującej atomy i molekuły gazów wchodzących w skład powietrza atmosferycznego jest promieniowanie emitowane przez pierwiastki radioaktywne znajdujące się w powietrzu i skorupie ziemskiej. Z dużą dozą ostrożności należy podchodzić do sztucznej jonizacji w pomieszczeniach, w których nie dokonano liczbowo pomiarów ich koncentracji. W celu wyeliminowania zagrożeń mikrobiologicznych w układach instalacji wentylacyjnej należy poddać powietrze skutecznej dezynfekcji. Jony ujemne powietrza przyspieszają reakcje biologiczne, a mianowicie poprawiają zdolność koncentracji, przyspieszają gojenie się ran, zmniejszają uczucie bólu, ale z kolei przyspieszają wzrost komórek nowotworowych. Natomiast jony dodatnie powodują osłabienie, ból głowy, otępienie, zwiększone zapotrzebowanie na tlen oraz występujące także nierzadko objawy suchości w ustach i jamie nosowej.
The impact of ionized air upon the human body depends on the size of ions, their polarity and concentration in the air as well as physicochemical properties of ion carriers (aerosols, bacteria). The main source of energy ionizing gas atoms and molecules forming the atmospheric air is radiation emitted by radioactive elements found in the air and the earth's crust. A very cautious approach must be assumed when considering artificial ionization in rooms where their concentration has not been measured. In order to eliminate microbiological hazards in ventilation systems the air should be subject to effective disinfection. Negative air ions accelerate biological reactions, improve concentration ability, accelerate healing of wounds, reduce feeling of pain, however, they support growth of cancer cells. On the other hand, positive ions cause fatigue, headache, stupefaction, increased demand for oxygen and frequent symptoms of dryness in the mouth and nasal cavity.

Źródło:

Zeszyty Naukowe. Inżynieria Lądowa i Wodna w Kształtowaniu Środowiska; 2011, 4; 26-29
2082-6702

Pojawia się w:

Zeszyty Naukowe. Inżynieria Lądowa i Wodna w Kształtowaniu Środowiska

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Transient induced molecular negative ions formed in cold electron collisions with polarized molecules

Autorzy:

Toader, E. I.
Graham, W. G.

Powiązania:

https://bibliotekanauki.pl/articles/147748.pdf

Data publikacji:

2008

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

interaction processes in plasmas
new negative molecular ions

Opis:

Using a relatively simple semiclassical model, it is shown that transient, induced molecular negative ions (TIMNI), are produced through a potential barrier interaction between cold electron collisions and polarizable molecules in plasma. Such new negative ions lead to radio-frequency absorption in such discharges. The calculated radio-frequency absorption frequencies are consistent with earlier experimental measurements.

Źródło:

Nukleonika; 2008, 53, 3; 123-126
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Systematic study of directed flow at RHIC energies

Autorzy:

Mignerey, A.

Powiązania:

https://bibliotekanauki.pl/articles/148368.pdf

Data publikacji:

2006

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

relativistic heavy ions
directed flow
PHOBOS
charged hadrons

Opis:

Directed flow, v1, of charged hadrons has been measured in Au-Au collisions at RHIC for center-of-mass energies square root(sNN) = 19.6, 130, 62.4, and 200 GeV using the PHOBOS detector. The large acceptance of PHOBOS for charged particles allows measurements over the full range of pseudorapidity |eta| < 5.4. The results for a symmetric subevent method are shown at all four energies. Comparison is made to a mixed harmonic method for the highest energy, and compared to similar results from the STAR collaboration.

Źródło:

Nukleonika; 2006, 51,suppl.3; 29-31
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Application of macrocycle compounds for metal ions separation and removal - a review

Autorzy:

Walkowiak, W.
Ulewicz, M.
Kozłowski, C. A.

Powiązania:

https://bibliotekanauki.pl/articles/346971.pdf

Data publikacji:

2002

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

macrocycles
crown ethers
lariat ethers
metal ions
separation

Opis:

A review is presented on macrocyclic compounds novel reagents for metal ions separation and removal in solvent extraction, transport through liquid membranes, and flotation processes. As macrocyclic compounds were used such chemicals as non-ionizable crown ethers, ionizable crown ethers (lariat ethers), calixarenes, and acyclic polyethers. Many literature data as well our own recent research data will be reported on metal ions removal and separation.

Źródło:

Ars Separatoria Acta; 2002, 1; 87-98
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

A singular radially symmetric problem in electrolytes theory

Autorzy:

Nadzieja, Tadeusz
Raczyński, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1339085.pdf

Data publikacji:

1998

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

radial solutions
electrodiffusion of ions
nonlinear parabolic equation

Opis:

Existence of radially symmetric solutions (both stationary and time dependent) for a parabolic-elliptic system describing the evolution of the spatial density of ions in an electrolyte is studied.

Źródło:

Applicationes Mathematicae; 1998-1999, 25, 1; 101-112
1233-7234

Pojawia się w:

Applicationes Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Effect of pH on surface characteristics and flotation of sulfidized cerussite

Autorzy:

Feng, Q.
Wen, S.
Zhao, W.
Liu, J.
Liu, D.

Powiązania:

https://bibliotekanauki.pl/articles/110234.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

cerussite
sulfidization
excessive sulfide ions
pH
surface analysis

Opis:

The effect of pH on surface characteristic and flotation of sulfidized cerussite was studied by micro-flotation tests, dissolution experiments, scanning electron microscopy (SEM) energy dispersive spectrometer (EDS), and X-ray photoelectron spectroscopy (XPS). The micro-flotation tests demonstrated that higher recovery of cerussite was achieved in acidic solutions than that in alkaline solutions. Despite the addition of high collector concentrations, cerussite flotation did not improved in alkaline solutions. The dissolution performance of sulfide-treated cerussite at different pH values indicated that the lead sulfide layer on the surface of sulfide-treated cerussite could exist in acidic solutions and it was more stable at acidic pH than in alkaline solutions. This finding was proved by the SEM-EDS and XPS analyses.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 676-689
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Sorbent-Catalyst for Acceleration of The Iron Oxidation Process

Autorzy:

Gomelya, Mykola
Tverdokhlib, Mariia
Shabliy, Tetyana
Radovenchyk, Vyacheslav
Linyucheva, Olga

Powiązania:

https://bibliotekanauki.pl/articles/1839169.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

iron ions
magnetite
sorbent
catalyst
deironing
sorption capacity

Opis:

In this work, the process of water deironing by using magnetite as a catalyst to accelerate the oxidation of iron ions in an aqueous medium was investigated. It was shown that the efficiency of iron ion extraction depends on the solution concentration, sorbent dose and contact time. In all cases, the use of magnetite accelerated the process of extraction of iron by more than an order of magnitude in comparison with similar experiments on the oxidation of iron without the addition of a catalyst. At the pH values greater than 6, the use of magnetite as a catalyst contributes to the deep purification of water from iron ions.

Źródło:

Journal of Ecological Engineering; 2021, 22, 3; 221-230
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Spectrophotometric Analysis of the Kinetic of Pd(II) Chloride Complex Ions Sorption Process from Diluted Aqua Solutions Using Commercially Available Activated Carbon

Autorzy:

Wojnicki, M.

Powiązania:

https://bibliotekanauki.pl/articles/354034.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

palladium
recovery
recycling
adsorption
sorption
chloride ions
spectrophotometry

Opis:

In this paper, results of adsorption kinetic studies of Pd(II) chloride complex ions on activated carbon Organosrob 10 CO are presented. Spectorphotometrical method was applied to investigate the process. Kinetic model was proposed, and fundamental thermodynamic parameters were determined. Proposed kinetic model describes well observed phenomenon in the studied range of concentration of Pd(II) chloride complex ions as well, as concentration of activated carbon.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 4; 2405-2411
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Modyfikowany napełniacz polimerów jako efektywny adsorbent jonów Cu(II) z roztworu wodnego
Modified polymers filler as an effective adsorbent of Cu(II) ions from an aqueous solution

Autorzy:

Wierzbicka, Ewa
Legocka, Izabella
Kuśmierek, Krzysztof
Świątkowski, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1789964.pdf

Data publikacji:

2021

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej

Tematy:

haloizyt
jony miedzi
adsorpcja
haloysite
copper ions
adsorption

Opis:

Haloizyt modyfikowany organicznymi związkami zawierającymi azot, wykorzystywany jako napełniacz polimerów, zastosowano do adsorpcji jonów Cu(II) z roztworu wodnego. Stwierdzono korelację ilości zaadsorbowanych jonów miedzi i ilości azotu związanego z powierzchnią haloizytu. Zwiększenie zawartości azotu na powierzchni haloizytu powodowało istotne zwiększenie zdolności adsorpcyjnej materiału w odniesieniu do jonów Cu(II).
The halloysite modified with nitrogen-containing organic compounds (used as a polymers filler) was used to adsorb Cu(II) ions from an aqueous solution. A correlation was found between the amount of adsorbed copper ions and the amount of nitrogen bound to the halloysite surface. Increasing of the nitrogen content significantly increased the adsorption capacity of the material in relation to Cu(II).

Źródło:

Polimery; 2021, 66, 4; 253--258
0032-2725

Pojawia się w:

Polimery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Comparative assessment of Al2O3 modified biomasses from agricultural residues for nickel and cadmium removal

Autorzy:

Herrera-Barros, Adriana
Tejada-Tovar, Candelaria
Gonzalez-Delgado, Angel D.

Powiązania:

https://bibliotekanauki.pl/articles/1844335.pdf

Data publikacji:

2021

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

adsorption
agricultural residues
alumina nanoparticles
cellulose
heavy metal ions

Opis:

The biodiversity of aqueous environments has been affected due to the disposal of wastewater highly contaminated with heavy metal ions, causing much damage to ecosystems. These pollutants are very toxic and bioaccumulate in living organisms. This work attempts to evaluate the adsorption of nickel ad cadmium ions using three biomasses from agricultural residues (corn cob – CC, orange peel – OP, and oil palm bagasse – PB) modified with alumina nanoparticles. The biomasses were characterized via compositional analysis and a point of zero charges to quantify the presence of lignin, cellulose, hemicellulose, and the feasible pH, taking advantage of the biomass charge. After modification with Al2O3 nanoparticles. The resulting adsorbents were characterized via FT-IR analysis to identify the functional groups that most contributed to the adsorption performance. Furthermore, the influence of Al2O3 nanoparticles was analysed on the adsorption capacities of the evaluated biomasses using batch systems at a temperature of 25°C and pH 6. All biomasses displayed a high content of cellulose, estimating a weight percentage of about 19.9%, 14.3%, and 13.1% for PB, OP, and CC samples, respectively. The FT-IR spectrum confirmed hydroxyl and carboxyl functional groups, which contribute to enhancing the adsorption capacities of the modified biomasses. Functional adsorption capacity was observed for all biomasses after modification with Al2O3 nanoparticles, achieving at pH 6.0 a cadmium removal from 92% (CC-Al2O3 and PB-Al2O3) up to 95.8±0.3% (OP-Al2O3). In nickel ions, it was estimated a broader adsorption capacity at pH 6.0 of about 86±0.4% after using the CC-Al2O3 sample, 88±0.1% for the PB-Al2O3 adsorbent, and 98±0.2% for the OP-Al2O3 sample, confirming the suitability of these Al2O3-modified biomasses for the removal of heavy metal ions.

Źródło:

Journal of Water and Land Development; 2021, 49; 29-34
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Surfactant-aided membrane process for copper ion removal from water solutions

Autorzy:

Klimonda, A.
Kowalska, I.

Powiązania:

https://bibliotekanauki.pl/articles/208193.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

copper
anionic surfactants
metal ions
miedź
surfaktant
roztwór wodny

Opis:

The usefulness of micellar-enhanced ultrafiltration (MEUF) for copper ion removal was evaluated. The experiments were performed in a semi-pilot installation in a cross-flow regime with the use of ultrafiltration modules (5 kDa and 10 kDa). The first stage of the tests included copper ion removal in the classic UF process. During the next step, anionic surfactant (sodium dodecylbenzenesulfonate, SDBS) was added to the feed solution in a wide range of concentrations. The effect of copper and surfactant concentrations on separation efficiency and permeate flux was evaluated. It was found that MEUF enables high copper ion removal. Depending on surfactant concentration in the feed solution, the average copper concentration in the permeate was in the range from 0.02 to 0.08 mM (feed solution 0.79 mM). Surfactant rejection was strongly dependent on its concentration in the feed; the highest retention was obtained when surfactant was in the form of micelles, i.e., for concentrations exceeding the CMC.

Źródło:

Environment Protection Engineering; 2018, 44, 1; 141-152
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Numerical simulations of generation of high-energy ion beams driven by a petawatt femtosecond laser

Autorzy:

Domański, J
Badziak, J.
Jabłoński, S.

Powiązania:

https://bibliotekanauki.pl/articles/146458.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

laser acceleration
laser plasma
ions
particle-in-cell simulations

Opis:

This contribution presents results of a Particle-in-Cell simulation of ion beam acceleration via the interaction of a petawatt 25 fs laser pulse of high intensity (up to ~1021 W/cm2) with thin hydrocarbon (CH) and erbium hydride (ErH3) targets of equal areal mass density (of 0.6 g/m2). A special attention is paid to the effect that the laser pulse polarization and the material composition of the target have on the maximum ion energies and the number of high energy (>10 MeV) protons. It is shown that both the mean and the maximum ion energies are higher for the linear polarization than for the circular one. A comparison of the maximum proton energies and the total number of protons generated from the CH and ErH3 targets using a linearly polarized beam is presented. For the ErH3 targets the maximum proton energies are higher and they reach 50 MeV for the laser pulse intensity of 1021 W/cm2. The number of protons with energies higher than 10 MeV is an order of magnitude higher for the ErH3 targets than that for the CH targets.

Źródło:

Nukleonika; 2015, 60, 2; 229-232
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Modification of Natural Clays for Use in the Processes of Sewage Treatment

Autorzy:

Pimneva, Lyudmila A.
Zagorskaya, Alla A.

Powiązania:

https://bibliotekanauki.pl/articles/124409.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

efficient waste treatment
clay adsobent
copper ions
adsorption isotherms

Opis:

The paper deals with the modification of clay sorbents in order to improve the efficiency of of copper ions extraction from wastewater. The study examined the elemental, mineralogical and phase composition of kaolin and montmorillonite clays. The authors analyzed the sorption capacity of natural sorbents under static conditions before and after modification with hydrochloric acid, sodium chloride and sodium hydroxide. The work also determines the change in the physical and chemical properties of the sorbent after modification. The most optimal modification conditions for the purification of wastewater from copper ions are distinguished.

Źródło:

Journal of Ecological Engineering; 2019, 20, 8; 12-17
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Mechanism of Ca2+/Fe3+-based synergistic activation of quartz

Autorzy:

Liu, Rongxiang
Yang, Zhanfeng
Li, Jie
Li, Qiang
Wang, Zhenjiang
Luo, Xiaofeng

Powiązania:

https://bibliotekanauki.pl/articles/2200345.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

quartz
flotation
co-activation
metal ions
sodium dodecyl sulfonate

Opis:

Although the flotation behaviors of iron concentrate and quartz are significantly different, quartz is the primary factor that affects the quality of iron concentrate. The flotation mechanism of quartz in the presence of mixed cationic Ca2+/Fe3+-co-activated SDS catcher was studied by conducting flotation tests with pure quartz mineral. The solution chemical calculation method, zeta potential calculation method, Fourier transform infrared (FT-IR) spectroscopy technique, X-ray photoelectron spectroscopy (XPS) technique, and other techniques were used to conduct the studies. The results showed that the maximum Ca2+/Fe3+-based synergistic activation of the flotation recovery process could be achieved in a certain range of pH values when three different activators were added sequentially. Analysis of the zeta potential values revealed that the Ca2+/Fe3+-activated quartz surface improved the extent of positive electricity generated and enhanced the SDS adsorption ability of the quartz surface. Results obtained using the FT-IR technique revealed that Ca2+/Fe3+ exerted a synergistic effect, and the adsorption process exploited the single oxygen bond interactions in the monovalent hydroxyl complex Ca(OH)+ and the double oxygen bond interactions in the Fe(OH)3 precipitates. Results obtained using the XPS technique revealed that the synergistic effect exerted by Ca2+/Fe3+ was significantly stronger than that exerted by Ca2+ or Fe3+ alone. The stable Fe-based six-membered chelate ring was formed on the surface of quartz when Fe3+ was the activator, and the chain-like Ca-based complex was formed when Ca2+ was the activator. The adsorption process on the surface of quartz proceeded following chemical as well as physical adsorption pathways. The results revealed that Ca(OH)+ and Fe(OH)3 played prominent roles during the activation of quartz surfaces in the presence of Ca2+/Fe3+.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 162262
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Extractive separation of rare earth ions by using calix[4]arene with isopropyl hydrogen phosphonate at upper rim

Autorzy:

Ohto, K.
Yamasaki, T.
Inoue, K.

Powiązania:

https://bibliotekanauki.pl/articles/346933.pdf

Data publikacji:

2006

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

calix[4]arene
phosphonate
rare earth ions
extraction
selectivity

Opis:

5,11,17,23-Tetrakis(isopropyl hydrogen phosphonomethyl)- 25,26,27,28 - tetrapropoxycalix[4]arene in cone conformation has been synthesized to investigate extraction behavior for nine trivalent rare earth metal ions from chloride media into chloroform, together with isopropyl hydrogen (4-propoxyphenyl)methylphosphonate as a corresponding monomer. Although the aqueous distributions of the present extractants were greater than those of butyl ester type of the previous extractants, they were trace and slight amounts under the experimental condition for calix[4]arene and monomeric derivatives, respectively. From the result of pH dependency, extraction takes place by a simple ion-exchange mechanism for both extractants. The extraction ability between the present extractants for rare earth ions was comparable. Results of a Job plot and a loading test indicate that for calix[4]arene derivative, stoichiometry of the extraction is 1:1. The separation efficiency of a calix[4]arene derivative is less than that of a monomeric derivative. It is attributed to the offset by the size effect of a coordination site at the larger upper rim of calix[4]arene (for relatively larger light rare earth ions) and strong affinity of phosphonate group to heavy rare earth ions. Such result is similar to that of derivatives with butyl ester.

Źródło:

Ars Separatoria Acta; 2006, 4; 96-106
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

A new cyclotriveratrylene derivative as turn-off fluorescent probe with quinoline appended arm for the selective and sensitive determination of Cu2+ ions

Autorzy:

Fernandes, Patrick F.
Mishra, Divya R.

Powiązania:

https://bibliotekanauki.pl/articles/1030477.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

8-quniolinesulfonyl chloride
Fluorescence studies
Sensors
copper ions
cyclotriveratrylene

Opis:

A novel supramolecular fluorescent molecular probe constructed on cyclotriveratrylene based derivative allied to 8-quinolinesulfonyl chloride (8QSC) was synthesized and used for the detection of copper ions among the various cations. Using 1H-NMR, 13C-NMR, and ESI-MS techniques the compound was successfully characterised. Furthermore the complexation behaviour of 8QSC-CTV with different cations were studied. A shift in the absorption spectra showed the detection of copper ion with the ligand 8QSC-CTV which concludes the strong binding interaction between the ligand and the cation. Furthermore the metal ion showed quenching in the emission spectra. The quantum yield of the metal complex was also studied. The stern volmer analysis concluded that the mechanism of fluorescence quenching is either purely dynamic or purely static.

Źródło:

World Scientific News; 2020, 144; 103-113
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

On a nonlocal elliptic problem

Autorzy:

Raczyński, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1338872.pdf

Data publikacji:

1999

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

electrodiffusion of ions
nonlinear elliptic problem
theory of semiconductors

Opis:

We study stationary solutions of the system $u_t = ∇ ((m-1)/m ∇u^m + u∇φ)$, m => 1, Δφ = ±u, defined in a bounded domain Ω of $ℝ^n$. The physical interpretation of the above system comes from the porous medium theory and semiconductor physics.

Źródło:

Applicationes Mathematicae; 1999, 26, 1; 107-119
1233-7234

Pojawia się w:

Applicationes Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

The effect of hydrothermal modification of titanium phosphate on the adsorption affinity towards cadmium ions

Autorzy:

Janusz, Władysław
Khalameida, Svietlana
Skwarek, Ewa
Sydorchuk, Vladimir
Charmas, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/110216.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

titanium phosphate
FTIR-ATR
hydrothermal treatment
adsorption
cadmium ions

Opis:

The effect of hydrothermal treatment of the gel or xerogel oftitanium phosphate (TiP) sample on the surface properties was studied usingthe EDS and FTIR ATR methods. The results show that the hydrothermal treatment of initial titanium phosphate decreases the amount of physically adsorbed water but increases the surface concentration of phosphate groups. Supplementary measurements of electrokinetic properties of modified and hydrothermally modified titanium phosphate samples confirmed an increase of the concentration of acidic groups on theTiP surface. The adsorption affinity of titanium phosphate towards cadmium ions was discussed. It was found that at a low initial concentration of cadmium ions adsorption affinity increases as a resultof hydrothermal treatment of TiP gel.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1568-1576
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Chemical characterization of bulk depositions in two cities of Upper Silesia (Zabrze, Bytom), Poland : Case study

Autorzy:

Michalski, Rajmund
Pecyna-Utylska, Paulina

Powiązania:

https://bibliotekanauki.pl/articles/2203100.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metals
Upper Silesia
ions
metalloids
bulk deposition
carboxylic acids

Opis:

The chemical composition of bulk deposition is an important aspect of assessing ambient air pollution. It contributes significantly to the removal of pollutants from the atmosphere and their transfer to other ecosystems. Thus, it is a reliable determinant of environmental chemistry. Therefore, bulk deposition can be considered useful for tracking the migration path of substances from different sources. The aim of the study carried out at five measurement points in Zabrze and Bytom was to assess the content of selected physico-chemical parameters in bulk deposition. Samples were collected continuously from November 2019 to November 2020. In the collected samples the following were determined: COD, pH, conductivity, dissolved organic carbon, inorganic carbon and total carbon; inorganic anions (Cl-, SO42-, NO3-, NO2-, Br-, PO43-) and cations (Li+, Mg2+, Ca2+, Na+, K+, NH4+), metals and metalloids (Mn, Ni, Co, Cu, Zn, As, Cd, Pb, Cr, and Fe), and carboxylic acids (formic, acetic, oxalic). The obtained test results were statistically processed using Excel, and the normality of data distribution was verified by Shapiro-Wilk test. The results show that pollutants transported in the atmosphere and introduced with precipitation in the Zabrze and Bytom areas are a significant source of area pollution of the region.

Źródło:

Archives of Environmental Protection; 2022, 48, 2; 106--116
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Comparative studies on the adsorption of Pb(II) ions by fly ash and slag obtained from CFBC technology

Autorzy:

Kalak, Tomasz
Cierpiszewski, Ryszard

Powiązania:

https://bibliotekanauki.pl/articles/780077.pdf

Data publikacji:

2019

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

fly ash
slag
adsorption of lead ions
isotherms
kinetics

Opis:

Fly ash and slag were examined for the removal processes of Pb(II) ions from water in batch experiments under different conditions of adsorbent dosage, initial concentration, pH and contact time. The materials are industrial waste generated from the high temperature treatment of sewage sludge by the circulating fluidized bed combustion (CFBC) technology. Physical and chemical properties, as well as adsorption efficiency and calculated maximum adsorption capacity of Pb(II) ions were determined using a variety of methods. The kinetic analysis revealed that the adsorption process is better described by the pseudo-second order equation and it is well fitted to the Freundlich model.

Źródło:

Polish Journal of Chemical Technology; 2019, 21, 4; 72-81
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 69.

Tytuł:

Variability of basic geothermal water parameters in Chochołów PIG-1 borehole in the western part of the Podhale Basin

Autorzy:

Operacz, A.

Powiązania:

https://bibliotekanauki.pl/articles/101021.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN

Tematy:

geothermal waters
groundwater temperature
common groundwater ions
Podhale Basin

Opis:

Geothermal waters under national conditions have the status of minerals, which means that their exploitation is carried out in accordance with the provisions of Geological and Mining Law. In the area of the Podhale Basin, one of the boreholes that extracts water of elevated temperature is the Chochołów PIG-1 borehole which constitutes the basis for the functioning of the Chochołowskie Termy recreation complex. The main feature of the waters intake due to the correct functioning of the complex is the stability of temperature and physicochemical parameters. The variability of most important hydrogeological parameters (temperature, SEC, SO42-, Cl-, HCO3-, Ca2+, Mg2+, Na+) with available data base were chosen for the analyzes. These parameters determine economic viability and proper conditions for the technical exploitation of geothermal borehole Chochołów PIG-1. Water chemistry has been studied in the area of ionic index markings determining the type of exploitating geothermal water. This paper presents the results of analyzes of selected parameters in the years 2016-2017 and indicates trends in their contents in the given period. The general conclusion is that under operating conditions in accordance with the approved performance, physicochemical parameters are characterized by relative stability. The appropriate exploitation of water from the Chochołów PIG-1 borehole allows for maintaining the proper temperature, which is the underpinning for the functioning of the recreation and balneology complex of the Chochołowskie Termy.

Źródło:

Infrastruktura i Ekologia Terenów Wiejskich; 2018, IV/1; 961-972
1732-5587

Pojawia się w:

Infrastruktura i Ekologia Terenów Wiejskich

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Fabrication of fluoride nanocrystals and their spectroscopic properties

Autorzy:

Pawlik, N.
Szpikowska-Sroka, B.
Goryczka, T.
Pisarski, W. A.

Powiązania:

https://bibliotekanauki.pl/articles/173278.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

sol-gel method
glass-ceramics
fluoride nanocrystals
europium ions

Opis:

In this work, the fabrication of glass-ceramic materials containing MF₃:Eu³⁺+ (M = La, Gd) nanocrystals dispersed in silica sol-gel hosts has been presented. The transformation from liquid sols towards bulk samples was also examined based on IR measurements. The crystallization temperatures and formation of MF₃ phases were verified based on TG/DSC analysis and XRD measurements. The optical properties of prepared Eu³⁺5D₀5D₀ → ⁷F_J (J = 1–4) emission bands, which were recorded within the reddish-orange spectral area under near-UV illumination (λ_exc = 393 nm). Recorded luminescence spectra and double-exponential character of decay curves for prepared glass-ceramic samples indicated the successful migration of Eu³⁺ dopant ions from amorphous silica framework to low-phonon energy MF₃ nanocrystal phases.

Źródło:

Optica Applicata; 2019, 49, 3; 415-426
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Comparison of sorption capacity of biochar-based sorbents for capturing heavy-metallic ions from water media

Autorzy:

Bąk, Justyna

Powiązania:

https://bibliotekanauki.pl/articles/2146935.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

biochar
chitosan
magnetic
M(II) ions sorption
nonlinear regression

Opis:

To develop the sorption efficiency of heavy metals: Cd(II), Co(II), Zn(II) and Pb(II) ions the biochar was modified by chitosan, FeSO4 and NaBH4. The morphology, physical structure and chemical composition of the biochar based sorbents were characterized by the scanning electron miscroscopy method, N2 adsorption and desorption isotherms, X-ray diffractometry as well as the Fourier transform infrared spectroscopywith the attenuated total reflectance analyses. The research of M(II) ions sorption was carried out as a function of pH (2-6), interaction time (0-360 minutes) and temperature (293, 313, 333 K). The maximum sorption was obtained by the ChBC for Zn(II) ions - 19.23 mg/g and for MBC-Pb(II) - 19.11 mg/g. Different kinetic models as well as both isotherm and thermodynamic equations were used the sorption data modelling. For Cd(II), Co(II) and Zn(II) ions the nonlinear regression of the Elovich equation gave the best fit for the experimental data. On the other hand, for Pb(II) ions, the nonlinear forms of pseudo first order and pseudo second order show a better match. The value of the correlation coefficient >0.960 determined from the Freundlich isotherm model is the highest suggesting a good fit to the experimental data. The thermodynamic parameters: ΔG°, ΔH° and ΔS° were listed and indicated that the process is spontaneous and endothermic in nature. The desorption efficiency was determined with the use of nitric, hydrochloric and sulfuric acids and the largest desorption yield for Pb(II)-ChBC equal 99.5 % was gained applying HNO3.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 150265
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 72.

Tytuł:

Sorption of Pb2+ ions from aqueous solutions on organic wastes (Part I)
Sorpcja jonów Pb2+ z roztworów wodnych na odpadach organicznych (Część I)

Autorzy:

Bożęcka, A.
Sanak-Rydlewska, S.

Powiązania:

https://bibliotekanauki.pl/articles/219954.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sorpcja
jony ołowiu
odpady organiczne
sorption
lead ions
organic wastes

Opis:

This article presents the results of the research on the Pb2+ ions sorption from model aqueous solutions on walnut shells, plum stones and sunflower hulls. The effect of various factors, such as the concentration of natural sorbent, the pH, and the temperature was studied. The process of Pb2+ ions sorption on studied sorbents was described by the Langmuir model. The best sorption capacity has been revealed for sunflower hulls. The maximum sorption capacity for this material was 36.9 mg/g.
W artykule przedstawiono wyniki badań, które dotyczyły usuwania jonów Pb2+ z modelowych roztworów wodnych za pomocą odpadów organicznych, takich jak: łuski słonecznika, łupiny orzecha włoskiego i pestki śliwek. Dla badanego zakresu stężeń od 6,0-110 mg/dm3 i warunków procesu największą wydajność sorpcji, będącą w zakresie (89,4-96,3)% uzyskano dla łusek słonecznika. W przypadku łupin orzecha włoskiego i pestek śliwek sorpcja jonów Pb2+ jest znacznie niższa a jej wydajność wynosi odpowiednio (60,8-78,7)% i (62,3-81,3)%. Zbadano także wpływ stężenia sorbentu, pH roztworu i temperatury na badany proces sorpcji. Dla wszystkich materiałów optymalne stężenie sorbentu wyniosło 5 g/dm3. Powyżej tej wartości nie obserwowano istotnych zmian w stopniu redukcji jonów Pb2+ (rys.2). We wszystkich przypadkach maksima sorpcji osiągnięto przy pH równym 4,0±0,1 co obrazuje rysunek 3. Obniżenie sorpcji, występujące przy pH poniżej i powyżej wartości 4,0 prawdopodobnie związane jest to z ładunkiem gromadzącym się na powierzchni sorbentu (elektrostatyczne odpychanie i przyciąganie badanych jonów). Wartość pH roztworu determinuje także formę oraz stężenie badanego jonu w roztworze. W roztworach silnie kwaśnych ołów występuje głównie w postaci kationów. Stopniowy wzrost pH prowadzi do tworzenia jonów kompleksowych i strącania go w postaci wodorotlenku. Wykazano również, że ze wzrostem temperatury w zakresie (293-313)K następuje stopniowy spadek sorpcji, co prawdopodobnie może być związane z niszczeniem miejsc aktywnych obecnych na powierzchni sorbentu lub przesunięciem równowagi procesu na korzyść desorpcji (rys. 4). Wyniki uzyskane potwierdzają również egzotermiczną naturę badanego procesu sorpcji. Adsorpcję jonów Pb2+ na użytych sorbentach opisano za pomocą modelu Langmuira. Założenia tego modelu podano w rozdziale 4.1. Najlepsze właściwości sorpcyjne w stosunku do jonów Pb2+ wykazałyłuski słonecznika. Maksymalna pojemność sorpcyjna dla tego sorbentu wyniosła 36,9 mg/g (tabela 1, rysunek 5). W przypadku łupin orzecha i pestek śliwek stała qmax izotermy Langmuira przyjmuje wartości równe 23,1 mg/g i 21,2 mg/g.

Źródło:

Archives of Mining Sciences; 2013, 58, 4; 1241-1250
0860-7001

Pojawia się w:

Archives of Mining Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 73.

Tytuł:

Sorption of Cd2+ ions from aqueous solutions on organic wastes
Sorpcja jonów Cd2+ z roztworów wodnych na odpadach organicznych

Autorzy:

Bożęcka, A.
Sanak-Rydlewska, S.

Powiązania:

https://bibliotekanauki.pl/articles/220322.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sorption
cadmium ions
organic wastes
sorpcja
jony kadmu
odpady organiczne

Opis:

This article presents the results of research on the Cd2+ ions sorption from model aqueous solutions on sunflower hulls, walnut shells and plum stones. The effect of various factors, such as mass of the natural sorbent, the pH, the time and the temperature was studied. The process of Cd2+ ions sorption on studied sorbents was described by the Langmuir model. The best sorption capacity has been achieved for sunflower hulls. The maximum sorption capacity for this material was 19.93 mg/g.
W artykule przedstawiono wyniki badań, które dotyczyły usuwania jonów Cd2+ z modelowych roztworów wodnych za pomocą odpadów organicznych, takich jak: łuski słonecznika, łupiny orzecha włoskiego i pestki śliwek. Wykazano, iż badane materiały mogą być skutecznie wykorzystywane do usuwania jonów Cd2+ z modelowych roztworów wodnych w układach jednoskładnikowych. Dla badanego zakresu stężeń i przyjętych warunków procesu sorpcji w układach jednoskładnikowych, największą wydajność sorpcji jonów Cd2+, osiągnięto dla łuszczyn słonecznika. Wyniosła ona 81,75-93,02%. Dla pozostałych materiałów sorpcja jest nieco niższa, ale również zadowalająca. W pracy podano interpretację otrzymanych wyników w oparciu o jeden z najpopularniejszych modeli izoterm adsorpcji − Langmuira, który potwierdził, iż najlepszym sorbentem jonów Cd2+, spośród badanych, są łuszczyny słonecznika. Materiał ten cechuje się największą wartością parametrów qmax i b izotermy Langmuira. W tym przypadku stała qmax, wyrażająca pojemność monowarstwy, przyjęła wartość 19,93 mg/g, a parametr b, określający powinowactwo do usuwanych jonów wynosi 0,2264 dm3/mg (Rys. 5, Tab. 1). Udowodniono również, że proces sorpcji jonów Cd2+ na badanych sorbentach organicznych zależy od masy sorbentu. Dla wszystkich materiałów stopień usunięcia jonów Cd2+ z roztworów wodnych rośnie ze wzrostem masy sorbentu, aż do uzyskania maksimum przy naważce 0,5 g (Rys. 1). Otrzymane wyniki potwierdzają ścisłą zależność między wartością pH oczyszczanych roztworów, a skutecznością usuwania jonów Cd2+ na badanych sorbentach. We wszystkich przypadkach maksimum sorpcji osiągnięto przy pH równym 4,0. Wydajność procesu sorpcji w roztworach o pH poniżej i powyżej 4,0 jest niższa (Rys. 2). Badania kinetyki sorpcji wskazują, iż równowaga badanych procesów ustala się po 60 minutach (Rys. 3). Wykazano również, że dla wszystkich badanych materiałów, wraz ze wzrostem temperatury w zakresie od 293 K do 313 K następuje obniżenie ich zdolności sorpcyjnych (Rys. 4).

Źródło:

Archives of Mining Sciences; 2015, 60, 3; 677-686
0860-7001

Pojawia się w:

Archives of Mining Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 74.

Tytuł:

Removal of uranium(VI) from aqueous solution by rice husk

Autorzy:

Xia, L.
Li, R.
Xiao, Y.
Zheng, W.
Tan, K.

Powiązania:

https://bibliotekanauki.pl/articles/208201.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

wheat straw
biosorption
uranium
ions
biosorpcja
słoma zbożowa
uran
jony

Opis:

Basic aspects of uranium adsorption by rice husk have been investigated. The influences of various experimental parameters such as pH, time, adsorbent dosage, rice husk size, temperature and various concentrations of uranium on uptake were evaluated. The thermodynamics and kinetics of adsorption were analyzed by FT-IR and SEM. The adsorption capacity for uranium on rice husk increased upon increasing initial concentration of uranium and temperature, while decreased with the increase of the amount of rice husk. Maximum uranium adsorption was observed at pH = 3 and particle size between 120 μm and 150 μm. Adsorption equilibrium was achieved within 60 min. At 25 °C, the saturated adsorption capacity qmax was up to 15.14 mg/g when the initial concentration of uranium ranged from 10 to 400 mg/dm₃. The adsorption of uranium followed Langmuir adsorption isotherm and according to quasi-second order kinetic equation. The calculated values of ΔH^°, ΔS°, and ΔG° indicated that the biosorption process was endothermic and spontaneous. Based on FT-IR spectra it may be concluded that hydroxyl, carbonyl, P–O and Si=O groups are the main active sites.

Źródło:

Environment Protection Engineering; 2017, 43, 4; 41-53
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Metalotioneiny i motywy policysteinylowe : oddziaływanie z jonami metali
Metallothioneins and polythiol motifs : interactions with metal ions

Autorzy:

Krzywoszyńska, K.
Kozłowski, H.

Powiązania:

https://bibliotekanauki.pl/articles/171939.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Chemiczne

Tematy:

metalotioneiny
motywy policysteinylowe
jony metali
metallothioneins
polythiol motifs
metal ions

Opis:

Many of biochemical paths and processes require some metal ions to occur. There are also known the negative effects of the presence of metal ions in the organism. The both sides of metal ions interactions on the living organism require specific regulations and cannot be left without supervision and control of the organism itself. One of the strategy to keep the control on metal ions are cystein-rich proteins that play crucial role in detoxication of metal ions that are dangerous for human organism as well as they help to maintain homeostasis of essential metal ions. Matallothioneins are one of the well known, but still not fully understood, cysteine- rich proteins. They are small proteins but may contain up to 30% of cysteine residues in the sequence, and what makes them very special from chemical point of view - all of the thiols present there are reduced [1]. This property makes these proteins very tempting for coordination of various metal ions. The most efficient binding to metallothionein is observed for the ions belonging to a Group 11 and 12. Cu⁺, Zn2⁺ and Cd2⁺ represent these metal ions [2]. Besides of the lack of disulfide bridges, metallothioneins show also the absence or low amount of aromatic amino acid residues in the sequence [1]. Studies of the metallothioneins and their isoforms among different organisms show that the position of cysteine residues is very conservative [3]. Considering this aspect of metallothionein structure, some specific motifs of cysteine residues arrangement can be found in the sequence of these proteins. Most of the common polythiol motifs are CXC, CXXC, CXXXC, CC – where C is a cysteine residue and X is random α-amino acid residue (other than cysteine) [3–5]. The influence of the cysteine residues organization on the specificity of metal ions binding was intensively studied. The differences observed for specificity of metal ions binding by metallothioneins and selected polythiol motifs are reviewed in this paper – with strong emphasis on the effect of the cysteine residues topography.

Źródło:

Wiadomości Chemiczne; 2018, 72, 7-8; 383-395
0043-5104
2300-0295

Pojawia się w:

Wiadomości Chemiczne

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 76.

Tytuł:

Effect of seawater main components on frothability in the flotation of Cu-Mo sulfide ore

Autorzy:

Laskowski, J. S.
Castro, S.
Ramos, O.

Powiązania:

https://bibliotekanauki.pl/articles/109747.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

seawater
froth stability
Cu-Mo flotation
magnesium ions
molybdenite flotation

Opis:

The main problem in the flotation of Cu-Mo sulfide ores in seawater is poor floatability of molybdenite at pH>9.5. Froth stability plays a very important role in determining concentrate grade and recovery in flotation operations and in this paper both floatability and frothability have been tested. The frothability have been studied by measuring froth equilibrium layer thickness in a modified laboratory flotation cell. Two chemical aspects of seawater need to be considered: the content of NaCl (around 87% of salinity), and the concentration of secondary ions (around 13%) (sulfate, magnesium, calcium, bicarbonate ions, etc.). Seawater, NaCl solutions, and seawater’s ions were found to depress frothability. The effect of pH on frothability over the pH range from 9.5 to 11, which is very strong in freshwater, becomes negligible in seawater and the tested electrolyte solutions. The analysis of the relationship between the mechanisms of molybdenite depression and the loss of frothability in seawater implies that the effects of the studied ions on molybdenite floatability and on pulp frothability are different. While depression of molybdenite floatability could be tracked down to magnesium hydroxide precipitation as a main culprit, the depression of frothability is a much more complicated issue.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 1; 17-29
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

The structure of electrical double layer formed on the kaolinite surface in the mixed system of cationic polyacrylamide and lead (II) ions

Autorzy:

Fijałkowska, Gracja
Wiśniewska, Małgorzata
Szewczuk-Karpisz, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/110490.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

kaolinite
cationic PAM
Pb(II) ions
electrical double layer
adsorption

Opis:

The bioavailability of toxic heavy metalsfor organisms depends mainly on the soil physicochemical properties, i.e. type and granulometric composition, pH value, redox potential, individual fractions content and microorganisms presence. The addition of artificial fertilizers rich in humic substances or polyacrylamide soil flocculants may also affect the content of easily absorbed heavy metal forms. Due to their chelating properties, the added substances can bind metal ions in the form of complexes characterized by low mobility in soil environment. As a consequence, the immobilization process takes place, which is a desirable phenomenon for organism health.The aim of the study was to determine the structure of electrical double layer formed on the kaolinite surface in the mixed system of cationic polyacrylamide and lead(II) cations. The influence of cationic PAM presence on the Pb(II) ions sorption on the kaolinite surface as well as heavy metal ion addition on the polymer adsorbed amount on the same clay mineral were studied. The adsorption and electrokinetic properties of studied kaolinite/CT PAM/Pb(II) systems were determined based on the spectrophotometric study, zeta potential measurements as well as potentiometric titration.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1339-1349
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 78.

Tytuł:

Complex Technology of Sewage Purification from Heavy-Metal Ions by Natural Adsorbents and Utilization of Sewage Sludge

Autorzy:

Zasidko, Iryna
Polutrenko, Myroslava
Mandryk, Oleg
Stakhmych, Yuliia
Petroshchuk, Nataliia

Powiązania:

https://bibliotekanauki.pl/articles/124975.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

heavy metal ions
adsorption
thermal pyrolysis
modifying additive
ceramic mixture

Opis:

The aspects of complex technology of sewage purification and utilization of purification sludge were investigated in the article. The authors substantiated the possibility of purifying sewage from heavy-metal ions by means of zeolite and utilizing sewage sludge in bricks production. The adsorption capacity of the zeolite from Sokyrnytsia deposit was studied for cupric and manganese ions in relation to its fractional composition. The comparative effectiveness studies of heavy metals adsorption by natural zeolite and anthracite were carried out. The optimal sorption parameters of these ions were selected based on the investigation results of their adsorption dynamics in the Cu²⁺ and Mn²⁺ solutions. The prospects of sewage sludge utilization by means of its thermal pyrolysis at the temperatures of 600-700°С were studied. The modifying additive was obtained, which can be added to the ceramic mixture and increase the porosity, reduce the density and decrease the thermal conductivity of course solid bricks.

Źródło:

Journal of Ecological Engineering; 2019, 20, 5; 209-216
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Influence of Lead-Zinc Slags of the Shymkent City on the Environment

Autorzy:

Salim, Yerbol
Issayeva, Akmaral
Kidirbayeva, K.
Zhumadulayeva, A.
Dossybayeva, G.
Bozhbanbaeva, N.
Ashirbayeva, S.

Powiązania:

https://bibliotekanauki.pl/articles/2173232.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

lead-zinc slag
lead ions
environment
phytoindication
accumulation
children's health

Opis:

Due to the rapid pace of urbanization, the lead-zinc slags previously located outside the settlement turned out to be within the city of Shymkent and began to pose a serious threat to the environment. Therefore, the purpose of the study was to investigate the impact of lead-zinc slags on the environment of Shymkent. It has been revealed that the fields of ruderal plant species are inversely correlated with the lead content in the soil, for phyto-indication of the state of soils, the most informative indicators are the phytocenotic composition and the projective covering of soils with vegetation. At the same time, the proportion of annual species in the control is 53.5 ± 5.6%; with an increase in the toxic load, their role gradually weakens, reaching from 14496.0 ± 105.1 mg/kg Pb2+ to 5.2 ± 0.4%. It was found that Dodartia orientalis, Centaurea squarrosa Willd., Plantago lancetofolium are hyperaccumulators of lead ions, while electron microscopic images showed that lead ions accumulate in the intercellular space of plants, forming significant conglomerates of 10–75 nm. The negative influence of lead-zinc waste has been established, which leads to the accumulation of lead in the blood of children and, as a consequence, is the cause of various diseases. The maximum lead content in the amount of 103 micrograms / dl was found in the blood of children in the area of the city, located 800–1000 m from the slag storage site. Developing hypochromic anemia in children indicates its toxic origin. It was revealed that 90% of children have such pathologies as biliary dyskinesia, dental caries, small anomalies of heart development.

Źródło:

Journal of Ecological Engineering; 2022, 23, 7; 83--89
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 80.

Tytuł:

Equilibrium and kinetic studies on the removal of heavy metal ions with natural low-cost adsorbents

Autorzy:

Varank, G.
Demir, A.
Bilgili, M. S.
Top, S.
Sekman, E.
Yazici, S.
Erkan, H. S.

Powiązania:

https://bibliotekanauki.pl/articles/207257.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

adsorbents
adsorption
bentonite
dyes
heavy metals
kinetics
metal ions
water treatment
heavy metal removal
heavy metal ions
heavy metals ions removal
adsorbenty
adsorpcja
bentonit
barwniki
metale ciężkie
kinetyka
jony metali
usuwanie jonów metali ciężkich
uzdatnianie wody

Opis:

Adsorption isotherms and kinetics of the removal of heavy metal ions (Ni, Pb, Zn) from aqueous solutions by natural adsorbents (zeolite, bentonite, clay) were investigated in a lab-scale batch study. The effect of various parameters such as adsorbent dosage, initial concentration of heavy metal ions, temperature, and agitation time were studied to optimise the conditions. Under those optimized conditions (180 rpm agitation rate, 120 min agitation time, pH 4.0, 298 K, 100 mg/dm3 initial adsorbate concentration), the removal percentages of heavy metal ions for natural adsorbents have been determined. The adsorption mechanisms and characteristic parameters of the process were analyzed by two and three parameter isotherm models (Langmuir, Freundlich, Temkin, Redlich-Peterson, Toth and Sips), and kinetic models (Lagergren's pseudo-first order, Ho and McKay's pseudo-second order). Adsorption thermodynamics of heavy metal ions (changes of standard enthalpy, entropy and free energy) on zeolite, bentonite and clay were also studied at 298,318 and 338 K.

Źródło:

Environment Protection Engineering; 2014, 40, 3; 43-61
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Ionic processes in irradiated solid polymers

Autorzy:

Szadkowska-Nicze, M.

Powiązania:

https://bibliotekanauki.pl/articles/147854.pdf

Data publikacji:

2005

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

irradiated polymers
radical ions
ion recombination
radiothermoluminescence
relaxation in polymers

Opis:

The reactions of ionic species generated in irradiated polymers (polyethylene, poly(dimethylsiloxane), poly(methyl methacrylate), and poly(ethylene terephthalate)) doped with pyrene, Py, were observed by radiothermoluminescence and complementary absorption spectroscopic measurements. The charge stabilization in polymers and charge transfer to the solute depend on the chemical structure of polymer chains and physical state of the polymer matrix. The recombination of ionic species is stimulated by relaxation processes of polymers. Total neutralization of charges in irradiated polymers occurs at the glass transition temperature of polymers. Mutual recombination of Py radical ions generates singlet excited states of the solute followed by Py monomer and excimer (depending on the solute concentration) fluorescence. Recombination of Py radical cations and negative species from the polymer matrix leads to the formation of Py triplet excited states followed by Py phosphorescence.

Źródło:

Nukleonika; 2005, 50,suppl.2; 45-49
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Kompozyty chitozanowo-zeolitowe otrzymywane na bazie popiołów lotnych do usuwania metali ciężkich
Chitosan-zeolite composites obtained from fly ashes for heavy metal ions removal

Autorzy:

Kołodyńska, D.
Franus, W.

Powiązania:

https://bibliotekanauki.pl/articles/394320.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

jony metali ciężkich
zeolity
chitozan
heavy metal ions
zeolites
chitosan

Opis:

Adsorpcja to jedna z najskuteczniejszych metod stosowanych do usuwania substancji toksycznych z roztworów wodnych. Skuteczność tej metody uzależniona jest od doboru i ilości odpowiedniego sorbentu. W ostatnim czasie obserwuje się wzrost zainteresowania usuwaniem szkodliwych i toksycznych związków od wód powierzchniowych i ścieków za pomocą tak zwanych sorbentów naturalnych. Wykazano m.in. dużą skuteczność usuwania fosforanów, jonów metali ciężkich, fluorków, boru ze ścieków za pomocą popiołów lotnych. Ponadto, w wielu pracach opisano wykorzystanie tego typu materiałów w usuwaniu barwników, fenoli, wielopierścieniowych węglowodorów aromatycznych i innych związków organicznych. Popioły lotne powstają w procesie spalania węgla. Roczna produkcja popiołów lotnych utrzymuje się na poziomie 5,5 • 10 8 Mg, przy czym największymi producentami popiołów lotnych są Chiny, USA i Indie. W Polsce w 2013 roku wytworzono 4,5 • 10 6 Mg popiołów lotnych z czego 87% zostało wykorzystane. Stwarza to ogromne problemy środowiskowe. Skład chemiczny i mineralogiczny jak również właściwości popiołów lotnych uzależnione są od pochodzenia, wartości kalorycznej węgla, a także innych parametrów, takich jak zawartość wody, rozmiar ziaren, stopień amorficzności itp. Popioły lotne mogą być stosowane w wielu dziedzinach, między innymi dodawane są do cementu i betonu. Ze względu na obecność mikro- i makroelementów stosuje się je w rolnictwie. Po procesie modyfikacji, m.in. za pomocą wysokiej temperatury, mielenia, działania kwasów czy dodatku chitozanu mogą być stosowane jako efektywne sorbenty substancji szkodliwych i toksycznych z wód i ścieków.
Adsorption is one of the most effective methods used to removal of toxic substances from aqueous solutions. The effectiveness of this method depends on the selection and amounts of the corresponding sorbent. Recently there has been observed growth of interest in removal of harmful and toxic compounds from surface waters and wastewaters by means of so called natural sorbents. Among others good efficiency of removal of phosphates, heavy metal ions fluorides, boron from wastewaters was proved by means of fly ash. Moreover, it is useful in removal of dyes, phenols, polycyclic aromatic hydrocarbons and other organic compounds as discussed in nu- merous papers. Fly ash is formed as a by-product in coal combustion. The yearly fly ash production is estimated to be 5.5 • 10 8 Mg, however, the largest amounts are produced in China, the USA and India. In Poland in 2013 there was created 4.5 • 10 6 Mg of fly ash, of which 87% was subjected to recovery. This enormous amount of industrial wastes can be a serious environmental problem. Chemical and mineralogical compositions as well as physicochemical properties of fly ash depend on geochemical origin and calorific capacity as well as water content, particle size, degree of amorphicity etc. Fly ashes can be used in many fields, among others, they are added to cement and concrete. Due to the presence of micro- and macroelements they are applied in agriculture. After modification using high temperature, grinding, acid activation or chitosan they can be applied as an effective sorbents of different pollutants from waters and wastewaters.

Źródło:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2016, 95; 145-155
2080-0819

Pojawia się w:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 83.

Tytuł:

Recovery of cobalt ions from diluted solutions by means of protonated dry alginate beads

Autorzy:

Aracena, Alvaro
Padilla, Sebastián
Jerez, Oscar

Powiązania:

https://bibliotekanauki.pl/articles/110037.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

recovery mechanism
cobalt ions
alginate beads
kinetic adsorption model
elution

Opis:

Mining effluents contain cobalt ions that can damage humans and flora. However, this meta also has high commercial value when recovered. The objective of this research work was to recover cobalt (Co²⁺) from diluted solutions using a biosorbent, specifically protonated dry alginate beads (PDAB). Experimental work was carried out in batch from an initial concentration of 22×10-6 kg dm^-3 Co²⁺ and 80 mg alginate. Variables such as agitation, pH solution, experimental time, isotherm values, and temperature were analyzed. Maximum cobalt recoveries were obtained at pH values above 5.0, reaching 60.6×10^-3 kg kg^-1 of PDAB. Cobalt recovery occurred with ion exchange mechanisms from alginate carboxyl group proton release. Experimental data had excellent fit with both the Lagergren kinetic model (pseudo-first order) and the Langmuir isotherm model. As temperature increased, cobalt recovery increased. The calculated activation energy was 12.8 kJ mol^-1. Compositional measurements obtained by scanning electron microscope and energy-dispersive X-ray spectroscopy for alginate crosssections showed uniform distributions of cobalt concentrations throughout the spherical alginate structure, independent of solution pH, contact time, or temperature. Furthermore, elution gave significant cobalt re-extraction (98.2%) and demonstrated PDAB reusability.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1286-1297
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Structure and surface energy of both fluorite halves after cleaving along selected crystallographic planes

Autorzy:

Janicki, M. J.
Drzymala, J.
Kowalczuk, P. B.

Powiązania:

https://bibliotekanauki.pl/articles/110167.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fluorite
fluoride
surface energy
interfacial energy
cleaving
reorganization
surface ions

Opis:

The density functional theory, supported with a commercial software, was used to compute the geometry and surface energy of fluorite cleaved along the (111), (110) and (100) planes. In the case of cleaving a piece of fluorite along the (111) plane the two newly created surfaces are identical consisting of fluorite ions with the surface energy equal to 0.384 J/m2. Cleaving fluorite along the (110) plane also provides identical halves and, both contain one Ca ion next to two F ions, with the surface energy equal to 0.723 J/m2. When cleaving takes place along the (100) plane, it creates two corresponding halves with different surface structures. One half, having only surface Ca ions (100Ca) has the surface energy equal to 0.866 J/m2, while the surface energy of the second half, having only F surface ions (100F), is 0.458 J/m2. Different structures and energies of the corresponding fluorite surfaces, that is (100Ca) and (100F) planes, should have an impact on their chemical properties, including hydrophobicity expressed by contact angle. The calculations performed in the paper also showed that reorganization of fluorite surfaces after cleaving was insignificant for all of the investigated planes.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 1; 451-458
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

A Change of Traditional Method of Treatment of Partial Thickness Burn with Hydrofibre Dressings

Autorzy:

Mitura, Kryspin
Osłowska, Jolanta
Mitura, Alicja

Powiązania:

https://bibliotekanauki.pl/articles/1395548.pdf

Data publikacji:

2015-02-01

Wydawca:

Index Copernicus International

Tematy:

skin burn wound
partial thickness burn
hydrofiber dressing
silver ions

Opis:

Nearly 1% of population is affected with burn trauma annually. Among patients seeking advanced medical care almost 8% require hospital stay. Most burns are superficial and do not cause full thickness damage to the skin. Standard topical treatment of burn wounds with creams and ointments requires frequent dressings’ changes. The healing process is long and expensive. The technological revolution, as occurred in the last decade in the field of dressing care allows us to introduce the use of advanced material solutions. Modern materials allow to shorten the treatment time, reduce the expenses and diminish the patient discomfort leading to good outcome. The study presented a case of four patients treated due to the partial thickness burn wound. Hydrofiber dressing with silver ions were introduced in the treatment. We observed good short and long term results

Źródło:

Polish Journal of Surgery; 2015, 87, 2; 91-96
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Impact from Counterion Nature on Current Transfer Through Structural Fragments of Sulphocationic Resin

Autorzy:

Malovanyy, Myroslav
Kononenko, Natalia
Demina, Olga
Petrushka, Kateryna

Powiązania:

https://bibliotekanauki.pl/articles/124840.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

ion-exchange resin
counter-ions
extended three-wire model
conductivity

Opis:

The parameters of an extended three-wire model of ion-exchange materials conductivity, which characterize the current particles flowing through various structural fragments of the ion exchanger, were calculated based on the concentration dependence of the sulphocationite KU-2 resin electrical conductivity in electrolyte solutions of different nature. It was shown that most of the current in the resin is transferred through the channel with a consecutive arrangement of conducting gel and solution phases, regardless of the counterion nature. The differences in model parameters for the resin in the salt and proton form, related to the specific mechanism of proton transfer, confirmed the adequacy of the applied approach to the estimation of the counterion nature effect on the current transfer in resin.

Źródło:

Journal of Ecological Engineering; 2019, 20, 3; 7-12
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Odsalanie powierzchni zabytkowych wypraw
The desalination of historical painted surface

Autorzy:

Kubik, J.
Kucharczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/391005.pdf

Data publikacji:

2013

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

odsalanie
przepływ jonowy
wysychanie
wilgoć
desalination
ions flow
drying
moisture

Opis:

W referacie wykonano wstępne badania odsalania z wykorzystaniem okładów z ligniny, często stosowanych w konserwacji obiektów zabytkowych. Zaproponowano metodykę szacowania efektywności tych zabiegów z wykorzystaniem modelu przepływów przypowierzchniowych.
In the paper the preliminary laboratory tests of desalination with the use of lignin poultices were made, often utilized in the maintenance of monumental buildings. In addition, the method of determining of the desalination efficiency was also proposed.

Źródło:

Budownictwo i Architektura; 2013, 12, 3; 53-58
1899-0665

Pojawia się w:

Budownictwo i Architektura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Separation of Co(II), Cu(II), Ni(II) and Mn(II) from synthetic hydrochloric acid leaching solution of spent lithium ion batteries by solvent extraction

Autorzy:

Nguyen, Viet Nhan Hoa
Lee, Man Seung

Powiązania:

https://bibliotekanauki.pl/articles/1449331.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

spent lithium-ion batteries
divalent metal ions
solvent extraction
separation

Opis:

Spent lithium ion batteries contain valuable critical metals such as cobalt, copper, lithium and nickel. In order to develop a process for the separation of the divalent metal ions from spent lithium ion batteries, solvent extraction experiments were performed by employing synthetic hydrochloric acid leaching solution. The synthetic solution contained Cu(II), Co(II), Mn(II) and Ni(II) and its acidity was 3 M HCl. Extraction with Aliquat 336 led to selective extraction of Cu(II) with a small amount of Co(II). After adding NaCl to the Cu(II) free raffinate to enhance the complex formation of Co(II), Co(II) was selectively extracted into Aliquat 336 together with Mn(II). The small amount of Mn(II) in the loaded Aliquat 336 was scrubbed by pure Co(II) solution. After adjusting the pH of the raffinate to 3, 91,3% of Mn(II) was selectively extracted over Ni(II) by the mixture of D2EHPA and Alamine 336. In this extraction, the mole fraction of D2EHPA in the mixture affected the extraction of Mn(II). McCabe-Thiele diagrams for the extraction of Cu(II) and Co(II) were constructed. Batch simulation experiments for the three stage counter-current extraction verified the selective extraction of the target metal ions in each extraction step. Namely, the total extraction percentage of Cu(II) and Co(II) was 71.6% and 98.8% respectively. Most metals in the loaded organic phase were stripped completely with the appropriate agents (1.0 M $H_2SO_4$ for Cu(II), 0.1 M H2SO4 for Co(II) and 0.3 M $HCl$ for Mn(II) stripping). A process was proposed to separate the metal ions by solvent extraction.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 4; 599-610
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 89.

Tytuł:

Thermal Effect of Er³⁺ Ions Embedded in Smart Nano-Composite Oxide Material Prepared by Sol-Gel Technique

Autorzy:

Battisha, I.
Ayoub, M.
Hashem, A.
Ahmed, E.
Amin, A.

Powiązania:

https://bibliotekanauki.pl/articles/1032584.pdf

Data publikacji:

2017-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

photonics
sol-gel
erbium ions
XRD
FESEM
HRTEM
optical refractive index

Opis:

The phosphosilicate for planar waveguides fabrication by using sol-gel, and particularly erbium-doped waveguide amplifiers, is reviewed. In particular, efforts to use sol-gel to improve molecular homogeneity in Er-doped phosphosilicate-based monolith and thin films will be discussed. A variety of material studies was carried out to investigate and optimize the sample preparation condition for such application. These include X-ray diffraction, the Fourier transform infrared and optical transmittance, absorption and refractive index calculation. The erbium nitrate precursors use is shown to alter the Er³⁺ ions doping in the prepared samples thermally treated in the final monolith glass form, in comparison to the use of thin film phosphosilicate sol-gel sample. Excess heat treatment is used to force prepared samples crystallization, moreover resulting photoluminescence analysis is used to detect the co-operative-up-conversion sample properties before and after heating.

Źródło:

Acta Physica Polonica A; 2017, 132, 4; 1277-1283
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Transport cząstek koloidalnych z zaadsorbowanymi jonami arsenu przez mineralne złoże porowate
Transport of colloidal particles with arsenic ions adsorbed on the colloidal surfaces through mineral porous bed

Autorzy:

Wróbel, I.
Polowczyk, I.
Sadowski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1819759.pdf

Data publikacji:

2009

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

jony arsenu
złoża mineralne
cząstki koloidalne
colloidal particles
arsenic ions
minerals

Opis:

Obecność odpadów przemysłowych w środowisku naturalnym staje się coraz bardziej zauważalnym problemem w ochronie środowiska. Za główne źródło ich powstawania, uważa się przemysł wydobywczy i przetwórstwa kopalin. W wyniku prowadzenia procesów wzbogacania, bądź procesów hutniczych, powstają odpady deponowane na hałdach, które w znaczący sposób przyczyniają się do zanieczyszczeń wód gruntowych. Dzieje się tak w wyniku transportu trudno rozpuszczalnych zanieczyszczeń przez naturalny polimineralny ośrodek porowaty. Zjawisko to zostało zaliczone do głównych procesów mających istotny wpływ na zanieczyszczanie wód gruntowych.
The storage of insecure industrial waste, descended from mining and metallurgical industry, has an influence on the pollution of a ground and groundwater. It is a result of migration of toxic substances into the bed of soli. The weathering processes and hydrodynamic changes in soil causes the colloidal particles formation, which are effective contaminations carriers through mineral porous media. In this paper transport of colloidal particles: synthetic hematite and natural kaolin has been investigated. The porous medias were waste from both Szklary and Złoty Stok heaps. The aim of this work is to inspect the influence of arsenate ions on the behaviour of colloidal particles in porous bed. The investigations were conducted in two ionic strengths: 5ź10-3 M KCl and 5ź10-4 M KCl, at pH 9.2-11.6. Results showed that transport of colloidal hematite was facilitated, when arsenic ions were adsorbed onto the colloid particles. Additionally, the increase of mobility of hematite was caused by a decrease of ionic strength. In the case of kaolin transport, the results showed an increase of kaolin particles migration without arsenic ions. These behaviour of colloidal kaolin particles into mineral bed isexplained by different surface property of kaolin particles. Results of examinations on colloidal particles of hematite and kaolin transport through column with mineral bed show, that examined mobility is conditioned with physico-chemical proprieties of colloidal particles and materials of porous bed. Studied colloids, can influence pollution of underground waters in the areas of storing of studied industrial wastes. Results of conducted measurements show, that the process of examined colloidal particles transport is influenced by presence of adsorbed arsenic ions. It is the most perceptible phenomenon in the case of the colloidal hematite, particularly for porous medium built from materials taken from the southern side of heap in Szklary and heap in Złot Stok. Additionally, influence of ion strength on quantity of transported colloidal particles through the layer of porous mineral medium was observed. When ion strength was decreasing, the thickness of the double electric layer increases on colloidal particles. It has impact on decrease of attracting interactions among particles of colloid, and also between colloidal particle and grain of mineral bed. The opposite case was noted during investigations on transportation of colloidal particles of kaolin. Adsorption of arsenic ions by particles of kaolin causes decrease of their mobility. This causes stopping of migration of arsenic ions to underground waters. The similar result is obtained when ion strength is enlarged.

Źródło:

Rocznik Ochrona Środowiska; 2009, Tom 11; 1119-1130
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Autorzy:

Strkalj, A.
Glavas, Z.
Slokar, L.

Powiązania:

https://bibliotekanauki.pl/articles/354568.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

waste foundry molding sand
Cu (II) ions
adsorption
SEM/EDS analysis

Opis:

This paper deals with the waste foundry molding sand which originally comes from the casting production. Adsorption of Cu (II) ions on the waste foundry molding sand was studied. Experimental data were processed using adsorption isotherms. Obtained results show that the experimental data are best described by the Langmuir isotherm. The following adsorption capacities are obtained: 7.153 mg/g to 293 K, 8.403 mg/g at 333 K and 9.208 mg/g at 343 K. The kinetics and thermodynamics of the process were analysed. The obtained results indicate that the adsorption process takes place according to the pseudo second order kinetic model with the following constants: 0.438 g/mg min at 293 K, 0.550 g/mg min at 333 K and 1.872 g/mg min at 343 K. The following values of ΔG° were obtained: − 95.49 J/mol at 293 K, − 736.99 J/mol at 333 K and − 1183.46 J/mol at 343 K. The value of ΔH° is − 4.16 kJ/mol and the value of ΔS° is 15.17 J/molK. These results were confirmed by microscopic examinations. The results indicate that the adsorption process of Cu (II) ions on waste foundry molding sand is possible. Results of microscopic examinations show the homogeneity of the surface, which is proof of the chemisorption. Cu (II) ions on the surface of the waste foundry molding sand were detected after adsorption by EDS analysis, which proves the existence of the adsorption process.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 4; 1805-1812
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 92.

Tytuł:

Investigation of flocculation properties and floc structure of coal processing plant tailings in the presence of monovalent and divalent ions

Autorzy:

Gungoren, Can
Unver, Ilgin Kursun
Ozdemir, Orhan

Powiązania:

https://bibliotekanauki.pl/articles/1845206.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

coal tailings
coagulation
flocculation
floc structure
colloidal particles
monovalent
divalent ions

Opis:

Low-rank coals are generally processed with wet methods including washing, flotation, etc. Fine-sized tailings of these processes are discharged to tailing ponds with a significant amount of associated water which contains a high amount of dissolved ions. These tailings should be dewatered employing coagulation/flocculation in terms of technological and environmental aspects. In this study, the coagulation/flocculation behavior of coal processing plant tailings obtained from Manisa, Turkey was investigated in the presence of monovalent (Na+, K+) and divalent (Mg2+, Ca2+) ions and an anionic flocculant (SPP-600). First, the coagulation properties of coal tailings were determined. Then, the flocculation experiments were carried out, and the turbidity values of the suspensions were measured. Moreover, the sizes of the flocs were determined using a laser diffraction particle size analyzer to analyze the strength of the flocs. The results of the coagulation experiments showed that while divalent ions were more effective at 10-1 mol/dm3, higher settling rate and lower turbidity values were obtained in the presence of monovalent ions at 1 mol/dm3 concentration. The optimum flocculant dosage was obtained as 150 g/Mg from the flocculation experiments. The floc size and strength measurements indicated that the larger flocs were obtained with Na+ than Ca2+ in the presence of the flocculant. The strongest flocs were obtained at 10-1 mol/dm3 Ca2+ + 150 g/Mg flocculant. It can be concluded from this study that the coagulation followed by the flocculation method can be employed to obtain fast flocculation behavior and low turbidity for the dewatering of coal tailings.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 5; 747-758
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Wpływ obecności i stężenia zanieczyszczeń w roztworach fosforanów (V) na rozmiary kryształów struwitu wydzielanego z tych roztworów w procesie ciągłej krystalizacji strąceniowej
Influence of presence and concentration of impurities in phosphate (V) solutions on the sizes of struvite crystals produced in a continuous reaction crystallization process

Autorzy:

Hutnik, N.
Matynia, A.
Kozik, A.
Mazieńczuk, A.

Powiązania:

https://bibliotekanauki.pl/articles/2071374.pdf

Data publikacji:

2011

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

struwit
jony fosforanowe(V)
jony zanieczyszczeń
krystalizacja ciągła z reakcją chemiczną
jakość produktu
struvite
phosphate(V) ions
impurity ions
continuous reaction crystallization
product quality

Opis:

Wydzielano struwit MgNH4PO46H2O z wodnych roztworów zawierających 1,0% mas. jonów fosforanowych(V), jony magnezowe i amonowe oraz jony typowych zanieczyszczeń nieorganicznych. Wyznaczono indywidualny wpływ stężenia każdego z badanych jonów na średni rozmiar kryształów produktu. Stwierdzono, że korzystnie oddziaływały jony glinu, miedzi(II), potasu, fluorkowe i fluorokrzemianowe, natomiast jony wapnia, żclaza(Il) i (111), cynku, azotanowe(V) i siarczanowe(Vf) spowodowały zmniejszenie rozmiarów kryształów struwitu.
Struvite MgNII4P04-6H20 was produced from water solutions containing 1.0 mass % of phosphate(V) ions, magnesium and ammonium ions, as well as ions of typical inorganic impurities. Individual influence of each tested ion concentration on the mean product crystal size was identified. Advantageous influence of aluminium, coppcr(II), potassium, fluoride and fluosilica-te ions was reported, whereas calcium, iron(II) and (III), zinc, nitratc(V) and sulphate(Vl) ions produced decrease of struvite crystal sizes.

Źródło:

Inżynieria i Aparatura Chemiczna; 2011, 5; 40-41
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 94.

Tytuł:

Removal of fluoride ions by ultrafiltration in the presence of cationic surfactants

Autorzy:

Klimonda, A.
Grzegorzek, M.
Majewska-Nowak, K.

Powiązania:

https://bibliotekanauki.pl/articles/208133.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ultrafiltration
fluoride ions
surfactant
membrane
ultrafiltracja
jony fluorkowe
fluor
surfaktanty
membrany

Opis:

The usability of surfactant-aided ultrafiltration for removal of fluoride ions from aqueous solutions has been investigated. The experiments were conducted with the use of cellulose and polyethersulfone membranes. Fluoride solutions containing 10 and 100 mg F^–/dm³ and cationic surfactants: octadecylamine acetate (ODA) and hexadecylpyridium chloride (CPC) were used in the experiments. The concentration of surfactants amounted to 320–960 mg/dm³. Ultrafiltration process was run under a trans-membrane pressure of 0.2 MPa. In the course of experiments, the effects of initial fluoride concentration, surfactant concentration and membrane type on the fluoride retention coefficient as well as the permeate flux were studied. It was found that the increase of the surfactant concentration effected in improvement of the separation efficiency. On contrary, the permeate flux decreased upon increase of the surfactant concentration. The process efficiency was also strongly influenced by the membrane and surfactant type. The permissible concentration of fluoride in the final product (below 1.5 mg F^–/dm³) was obtained for the test with initial solutions containing 10 mg F^–/dm³, polyethersulfone membrane and CPC con-centration equal to 644 and 966 mg/dm³.

Źródło:

Environment Protection Engineering; 2017, 43, 2; 5-13
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Response surface methodology for cobalt removal from aqueous solutions using Isparta pumice and zeolite 4A adsorbents

Autorzy:

Çiçek, E.
Cojocaru, C.
Zakrzewska-Trznadel, G.
Jaworska, A.
Harasimowicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/146766.pdf

Data publikacji:

2008

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

zeolite
Isparta pumice
adsorption
radioactive waste
cobalt ions
response surface methodology

Opis:

In this study, the adsorption of non-radioactive cobalt ions from aqueous solutions onto Isparta pumice and zeolite 4A sorbents was investigated. Both adsorbent materials have been activated at 873 K for 2 h prior to adsorption experiments in batch mode. The maximum removal efficiencies of 90% and 99% have been obtained experimentally using Isparta pumice and zeolite 4A, respectively. In addition, the experiments with radioactive 60Co were performed to test zeolite ability to remove radioactive compounds. Likewise, the response surface methodology (RSM) has been applied to develop the predictive regression models to describe the adsorption of cobalt and radiocobalt ions onto zeolite 4A and Isparta pumice. The results indicated that zeolite 4A as well as Isparta pumice could be used as the efficient sorption materials for cobalt and radiocobalt ions removal.

Źródło:

Nukleonika; 2008, 53, suppl. 2; 121-128
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Principles and applications of solvent sublation - a review

Autorzy:

Sobianowska, K.
Walkowiak, W.
Kozłowski, C.

Powiązania:

https://bibliotekanauki.pl/articles/346991.pdf

Data publikacji:

2010

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

solvent sublation
ion flotation
adsorptive bubble separations
metal ions
organic compounds

Opis:

This article reviews more than 50 references covering the solvent sublation as one of the adsorptive bubble separation methods for organic and inorganic coumpounds removal from aqueous solutions, which were published last 50 years. The solvent sublation is very simple, effective and fast process for removal and separation of chemical compounds from dilute aqueous solutions and can be treated as preconcentration method in their analytical determination. This review concerns the fundamentals of solvent sublation process and desribes the factors determinating the process (temperature, composition of initial aqueous solution, pH, ionic strength, surfactants and ligands presence, organic solvent presence with additives and gas bubble generation). The examples of metal ions selective removal (Table 1) and organic coupounds removal (Table 2) are shown.

Źródło:

Ars Separatoria Acta; 2009-2010, 7; 23-38
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Zmienność cech oleju rzepakowego w warunkach przechowywania
Variance of rape oil qualities under storage conditions

Autorzy:

Cieślikowski, B.
Ślipek, Z.

Powiązania:

https://bibliotekanauki.pl/articles/289540.pdf

Data publikacji:

2006

Wydawca:

Polskie Towarzystwo Inżynierii Rolniczej

Tematy:

olej rzepakowy
przechowywanie
jony wodorowe
rape oil
quality
hydrogen ions
storage

Opis:

Przeprowadzone badania oleju wytłoczonego z odmian rzepaku: Kaszub, Heros, Kano, Mozart, Sponsor, Rasmus, Landmark, Lirajet, wykazały istnienie zależności pomiędzy okresem przechowywania a spadkiem wartości pH. Wyznaczono kolejność najniższego tempa spadku pH dla badanych próbek w warunkach laboratoryjnych w różnorodnych warunkach przechowywania. Dobór zróżnicowanych pod względem materiałowym pojemników został podyktowany rodzajem materiałów z jakich wykonane są zbiorniki paliwowe pojazdów oraz zbiorniki przeznaczone do przechowywania oleju rzepakowego. Pomiar pH dla każdej próbki dokonywany był w okresie 105 dni w cyklu co 15 dni. W wyniku przeprowadzonych doświadczeń wykazano, że każda odmiana rzepaku cechuje się indywidualną wrażliwością na proces przechowywania. Badania te pozwolą na wskazanie optymalnych warunków przechowywania oleju, a także wyznaczą odmiany rzepaku, z których uzyskany olej będzie charakteryzował się najniższym wzrostem kwasowości.
Performance of tests of oil pressed off rape variations: Kaszub, Heros, Kano, Mozart, Sponsor, Rasmus, Landmark, Lirajet, revealed existing relationship between a storage period and decrease of pH value. A sequence of the lowest pH decrease rate was set out for tested samples under laboratory conditions in different storage conditions. Selection of containers varying with respect to material was dictated by the type of materials from which vehicle fuel tanks and tanks designed for storing rape oil, are made. The pH measurement for each sample was made within a period of 105 days every 15 days. The performed experiments demonstrated that each rape variation characterized by individual sensitivity to storage process. These tests will allow to indicate optimal oil storage conditions, and set out rape variations, for which the produced oil will be characterized by the lowest increase in acidity.

Źródło:

Inżynieria Rolnicza; 2006, R. 10, nr 13(88), 13(88); 61-68
1429-7264

Pojawia się w:

Inżynieria Rolnicza

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Próba oceny możliwości zastosowania szkieł wodnych do usuwania metali ciężkich
An attempt to asses the potential of water glasses application to aluminum removal from media

Autorzy:

Koźlak, W.

Powiązania:

https://bibliotekanauki.pl/articles/272214.pdf

Data publikacji:

2008

Wydawca:

Górnośląska Wyższa Szkoła Pedagogiczna im. Kardynała Augusta Hlonda

Tematy:

szkło wodne
metale ciężkie
środowisko
water glass
toxic aluminium ions
environment

Opis:

Metodą turbidymetryczną, polegającą na otrzymywaniu rozpuszczalnego koloidalnego krzemianu glinu, badano układy zawierające szkło wodne sodowe produkcji szwedzkiej oraz wybrane sole glinu. Z przebiegu krzywych zmętnienia wynika, że w wielu przypadkach krzemian glinu powstaje natychmiast w czasie t = 0 tj. w początkowej fazie pomiaru i w zasadzie nie ma dalszego przyrostu zmętnienia w czasie. Wykazano, że na powstanie krzemianu glinu ma również wpływ rodzaj anionu badanej soli. Względne rozmiary cząsteczek krzemianu glinu i ich średnie promienie są podobne co świadczy, że jony Al1+ reagują z tym samym rodzajem anionów krzemianowych. Stwierdzono, że szkła wodne sodowe mogą być wykorzystane do usuwania toksycznych jonów glinu z mediów.
Systems including Swedish-made sodium water glass and selected aluminum salts were tested using turbimetric method consisting in producing soluble colloidal aluminum silica. The course of the turbidity curves indicates that aluminum silicate is produced instantly in time = 0 i.e. at the initial phase of the measurement and practically no further increase of turbidity in time is observed. It has been proved that the anion type of a selected salt impacts the production of the aluminum silicate. A relative size of the aluminum silicate particles and their average radiuses are similar which proves that Al3+ ions react with the same type of silica anions. It has been stated that sodium water glasses may be used for removal of toxic aluminum ions from media.

Źródło:

Problemy Ekologii; 2008, R. 12, nr 4, 4; 215-221
1427-3381

Pojawia się w:

Problemy Ekologii

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Cloning, purification and enzymatic characterization of recombinant human superoxide dismutase 1 (hSOD1) expressed in Escherichia coli

Autorzy:

Lin, Feng
Yan, Dandan
Chen, Yawen
E, Fletcher
Shi, Haifeng
Han, Bangxing
Zhou, Yang

Powiązania:

https://bibliotekanauki.pl/articles/1038395.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

superoxide dismutase 1
Escherichia coli
soluble expression
metal ions
catalytic activity

Opis:

Superoxide dismutase 1 (SOD1) is a metalloenzyme that catalyzes the disproportionation of superoxide into molecular oxygen and hydrogen peroxide. In this study, the human SOD1 (hSOD1) gene was cloned, expressed and purified. The hSOD1 gene was amplified from a pool of Bxpc3 cell cDNAs by PCR and cloned into expression vector pET-28a (+). The recombinant soluble hSOD1 was expressed in E. coli BL21 (DE3) at 37°C and purified using nickel column affinity chromatography. Soluble hSOD1 was produced with a yield of 5.9 μg/mL medium. As metal ions can have a certain influence on protein structure and activity, we researched the influences of different concentrations of Cu2+ and Zn2+ on hSOD1 activity at induction and the time of activity detection. The results implied that Cu2+ and Zn2+ do not enhance SOD1 expression and solubility; they can, however, improve the catalytic activity at induction. Meanwhile, Cu2+ and Zn2+ also enhanced the enzyme activity at the time of detection. Furthermore, most other bivalent cations had the potential to replace Zn2+ and Cu2+, and also improved enzyme activity at the time of detection.

Źródło:

Acta Biochimica Polonica; 2018, 65, 2; 235-240
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:

The Regulatory Framework of the Soviet Diplomatic Protocol. History of Formation

Autorzy:

Zakharova, Oksana

Powiązania:

https://bibliotekanauki.pl/articles/1930492.pdf

Data publikacji:

2020-06-30

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

foreign policy
diplomacy
state image
ideology
diplomatic recept ions
foreign visits

Opis:

The concept of “diplomacy” combines the foreign policy activities of state leaders and supreme authorities. At various stages of the development of society the methods and means of diplomacy changed. In the Middle Ages the protocol is the rules of paperwork and archiving. Subsequently ceremonial issues began to be attributed to the diplomatic protocol. Currently the diplomatic protocol is a set of generally accepted norms, traditions and conventions that are observed in international communication. The purpose of the study is to analyze the evolution of the Soviet protocol as an instrument of the state’s foreign policy based on the analysis of regulatory documents. The novelty of the study lies in the fact that the author considers the diplomatic legal culture as a component of the image of the state, in which ideology influenced all aspects of society, including the rules of communication between a Soviet citizen and foreign partners. It was revealed that the employees of the Protocol Department of the People’s Commissariat for Foreign Affairs (PCFA), and primarily its head D.T. Florinsky (repressed in 1934) and V.N. Barkov (repressed in 1941, rehabilitated in 1958), were able to “reconcile”, as evidenced by regulatory documents, the European diplomatic protocol with the norms of Soviet ideology. Through its work the Protocol Department tried to destroy the idea of the USSR as an “empire of evil”; it was part of the positive image of the USSR, like the Bolshoi Theater, Soviet sports and Russian literature. As an actor in world politics the Soviet Union could not but accept the main provisions of the Vienna Convention on Diplomatic Relations. Ignoring the international norms of the protocol is a denial of equality, sovereignty, territorial integrity of the state, and as a result, loss of reputation in the eyes of the world community.

Źródło:

Krakowskie Studia Małopolskie; 2020, 2(26); 150-163
1643-6911

Pojawia się w:

Krakowskie Studia Małopolskie

Dostawca treści:

Biblioteka Nauki

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