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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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Effect of platinum ions on the heavy metal ions in loessial soil. Part I: Copper ions
Autorzy:
Bojanowska, M
Jackowska, I.
Powiązania:
https://bibliotekanauki.pl/articles/1449382.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
copper ion
soil
loess
soil property
metal ion
degraded ecosystem
anthropogenic ecosystem
platinum ion
heavy metal
Opis:
Studies on the possibilities of activating heavy metal ions by platinum ions in the soil have been undertaken. The present work gives results of research on the copper ions activated in loessial soil by the treatment with solutions containing platinum ions. Samples of podzolic soil developed from loess were collected from the horizon Ap (0-20 cm). The samples were treated with re-distilled water or with the same quantity of PtCl4 water solutions containing 2, 4, 20 mg of platinum ions. Soil reaction (pH) was measured after 1, 2, 3, 4, 5 and 6 months of incubation at 5 and 20 °C temperature. Copper ion content was determined in the filtrates using the technique of atomic absorption spectrometry. The amount of copper ions activated in the soil material depended on the soil reaction, temperature, quantity of platinum ions introduced and the time duration of the experiment.
Źródło:
Acta Agrophysica; 2001, 51; 181-187
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Wyświetlanie 1-15 z 796

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