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Tytuł:
Crosslinked poly(hydroxybutyl acrylate-co-acrylamide) based hydrogels : synthesis, characterization, and performance evaluation in heavy metal removal
Hydrożele na bazie usieciowanego poli(akrylanu hydroksybutylo-co-akrylamidu) : synteza, charakterystyka i ocena zdolności do usuwania metali ciężkich
Autorzy:
Abdallah, Zahraa Saadi
Mohammed, Ameen Hadi
Powiązania:
https://bibliotekanauki.pl/articles/24202779.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
superabsorbent polymer
hydroxybutyl acrylate
acrylamide
adsorption properties
heavy metal ions removal
polimery superchłonne
akrylan hydroksybutylu
akryloamid
właściwości adsorpcyjne
usuwanie jonów metali ciężkich
Opis:
By radical polymerization, two series of superabsorbent hydrogels of hydroxybutyl acrylate and acrylamide copolymers, poly(HBA-co-AAm), were obtained. In the first series, the ratio of hydroxybutyl acrylate to acrylamide was optimized with a constant amount of methylene bisacrylamide (MBA) as a cross-linking agent. In the second series, the amount of MBA was changed at a fixed monomer ratio. The structure of the copolymers was confirmed by the FTIR method. Swelling parameters and mechanical properties were tested. Hydrogels with a high Young’s modulus and a high degree of swelling were selected for the study of adsorption properties towards Co2+, Ni2+ and Cd2+ ions. The influence of basic factors such as adsorbent dose, exposure time and pH on adsorption efficiency was also investigated. The ability to adsorb heavy metal ions changed as follows: Co2+> Ni2+> Cd2+.
Metodą polimeryzacji rodnikowej otrzymano dwie serie superchłonnych hydrożeli kopolimerów akrylanu hydroksybutylu i akryloamidu, poli(HBA-co-AAm), otrzymano. W pierwszej serii optymalizowano stosunek akrylanu hydroksybutylu do akryloamidu przy stałej ilości metylenobisakryloamidu (MBA) jako czynnika sieciującego. W drugiej serii przy ustalonym stosunku monomerów zmieniano ilość MBA. Strukturę kopolimerów potwierdzono metodą FTIR. Zbadano parametry pęcznienia oraz właściwości mechaniczne. Do badań właściwości adsorpcyjnych w stosunku do jonów Co2+, Ni2+ i Cd2+ wytypowano hydrożele o wysokim module Younga i wysokim stopniu pęcznienia. Zbadano również wpływ podstawowych czynników, takich jak dawka adsorbentu, czas ekspozycji i pH na efektywność adsorpcji. Zdolność do adsorpcji jonów metali ciężkich zmieniała się następująco: Co2+> Ni2+> Cd2+.
Źródło:
Polimery; 2023, 68, 2; 86--92
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ soli Fe3+ na fotokatalityczny rozkład substancji promieniochronnych w wodnej zawiesinie TiO2
Effect of Fe3+ salts on the photocatalytic decomposition of sunscreens in the aqueous suspension of TiO2
Autorzy:
Adamek, E.
Baran, W.
Sobczak, A.
Szczepka, N.
Powiązania:
https://bibliotekanauki.pl/articles/126575.pdf
Data publikacji:
2013
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
fotokataliza
sole Fe3+
TiO2 P25
substancje promieniochronne
photocatalysis
Fe3+ ions
photodegradation
sunscreens
Opis:
Przedmiotem badań były dwie substancje promieniochronne: benzofenon 4 (BP-4) i kwas fenylenobenzimidazolosulfonowy (PBSA). W pracy zbadano możliwość zwiększenia efektywności procesu fotokatalitycznego utleniania tych związków, prowadzonego w obecności TiO2 P25, po dodaniu soli Fe3+. Roztwory wodne zawierające próbki badanych substancji promieniochronnych naświetlano promieniowaniem UVA (λmax 366 nm) w obecności wyłącznie TiO2 P25 lub soli Fe3+ oraz w mieszaninie TiO2 P25 i soli Fe3+, w każdym przypadku przy pH~3. W próbkach pobieranych podczas naświetlania oznaczano metodą HPLC stężenie nierozłożonych substancji promieniochronnych. W pracy oceniano m.in. dynamikę zmian stężenia tych związków w trakcie procesu fotodegradacji oraz określono jego kinetykę. Stwierdzono, że w warunkach doświadczalnych obie substancje promieniochronne ulegały fotokatalitycznej degradacji, a jony Fe3+ miały wpływ na szybkość tego procesu. Efektywność ich fotodegradacji w mieszaninie TiO2 P25 i soli Fe3+ była większa w porównaniu z analogicznym procesem prowadzonym w obecności samego TiO2 P25. Stwierdzono też, że omawiany proces przebiegał zgodnie z kinetyką reakcji pseudopierwszego rzędu.
The subjects of this study were two sunscreens: 2-hydroxy-4-methoxy benzophenone-5-sulphonic acid (benzophenone 4, BP-4) and 2-phenylbenzimidazole-5-sulfonic acid (PBSA). In this paper the possibility of increasing the photocatalytic oxidation efficiency of these compounds after the addition of Fe3+ salts to TiO2 P25 suspension was studied. Aqueous solutions containing the investigated compounds were irradiated with UVA radiation (λmax 366 nm) in the presence of TiO2 P25 or Fe3 + salt only and in a mixture of TiO2 P25 with Fe3+ salt in all cases at pH ~ 3. In the samples taken during irradiation, the concentrations of undecomposed sunscreens were Wpływ soli Fe3+ na fotokatalityczny rozkład substancji promieniochronnych w wodnej zawiesinie TiO2 279 determined using RP-HPLC method. Additionally, the dynamics of the concentration changes during the photodegradation process and its kinetics were determined. It was found that under experimental conditions, both sunscreens underwent the photocatalytic degradation and Fe3+ ions influenced the rate of this process. Their photodegradation efficiency in the presence of TiO2 P25 with Fe3+ salt was higher than that obtained in the process carried out in the presence of TiO2 P25 alone. Moreover, the process was in accordance with the first-order kinetics.
Źródło:
Proceedings of ECOpole; 2013, 7, 1; 273-279
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of industrial divinyl rubber by oxidative chlorophosphorylation and assess-ment of metal ion removal efficiency of obtained polymer sorbent
Autorzy:
Akhmedov, V. M.
Alfadul, S.
Maharramov, A. M.
Azizov, A. A.
Alosmanov, R. M.
Buniyad-Zadeh, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/778480.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Divinyl rubber
modification by chlorophosphorylation
nature and distribution of phosphoric functionalities in the polymer matrix
heavy metal ions
sorption
Opis:
The main goal of this study was the preparation of materials containing phosphoric functionalities on the base of industrial polymer - divinyl rubber and the assessment of their removal efficiency of heavy metals from aqueous solutions. The new method concerns the oxidative chlorophosphorylation of divinyl rubber by PCl3 with the following modification of obtained inter-mediates to create -PO(OH)2, -OPO(OH)2&enspgroups in the polymer chain. The obtained modified polymers get some new properties such as complex formation and capability for ion exchange. The nature and distribution of phosphoric functionalities in the polymer were studied by the methods of NMRand FTIR- spectroscopy, thermal analysis and scanning electron microscopy. The sorption properties of synthesized polymers towards some cations (Cu+2, Ni+2, Co+2 and Zn+2) from water solutions have been tested. It has been shown that the metal removal efficiency of prepared material depends on pH of medium, initial concentration and type of metal ions
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 2; 112-118
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mitigation of scale problem in the pumped Disi water to Amman, Jordan
Autorzy:
Al-Maabreh, Alaa M.
Al-Rawajfeh, Aiman Eid
Alshamaileh, Ehab
Al-Bazedi, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/206973.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
scale deposition
water parameters
plumbing system
multivalent ions
osadzanie się kamienia
parametry wody
systemy hydrauliczne
jony wielowartościowe
Opis:
Various methods are known to mitigate or prevent scale formation in pipes, rather by chemical addition, e.g., anti-scaling substances, or physically which includes ultrasonic or nanofiltration (NF). Nanofiltration membranes have a selectivity for the multivalent charged ions, so monovalent ions will pass the membrane partly and multivalent ions will be rejected completely. Chemical addition to prevent scale formation is based on justifying water parameters such as pH, alkalinity, and concentrations of ions that form the building units of scale crystal. In order to mitigate the scaling tendency in water pumped from the Disi aquifer to Amman city along its 345 km pipeline, different studies were conducted using simulated plumbing system. This part of the study is concerned with scale mitigation using nanofiltration and addition of chemicals. Nanofiltration was applied to reduce the hardness that causes scale deposition where it rejected around 70.5% of Ca2+, 71.98% Mg2+, 7.72% K+, 29.0% Na+, 66.63% Cl–, 86.51% NO3 – , 85.72% SO4 2–, and 69.85% CO2. Increasing the concentration of some ions such as Na+, K+ and Cl– keeping the allowable limit gave good results for scale mitigation.
Źródło:
Environment Protection Engineering; 2019, 45, 1; 97-110
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogeochemical processes and evaluation of groundwater in Al-Salman area – Iraqi Southern Desert
Autorzy:
Al-Mutawqi, Kareem Ghafel
Ewaid, Salam Hussein
Abed, Salwan Ali
Al-Ansari, Nadhir
Salim, Mudhafar A.
Kadhim, Ameer J.
Powiązania:
https://bibliotekanauki.pl/articles/1841953.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
Dammam formation
Durov diagram
facies
Gibbs diagram
groundwater
hydrogeochemical processes
Iraqi Southern Desert
major ions
Piper diagram
Opis:
A field survey has been conducted for the study area using the Global Positioning System (GPS) and geological and geomorphological maps of the area. The study area is one of the important areas in Iraq characterized by scarce water resources. The purpose of the study is to determine the hydro-chemical processes and their relationship to groundwater quality carried out in the southwestern desert region of Iraq, where the region lacks extensive studies of water resources. Twenty-eight groundwater samples were collected from wells distributed between the eastern borders of Saudi Arabia and the West Bank of the Euphrates River. For the purpose of hydrogeochemical analyses, the Fetter method was used to collect and examine samples. A large part of the recharge area is located in Saudi Arabia, where the groundwater bearing aquifer represented by the Dammam formation extends to Iraq and Saudi Arabian International borders. The analysis determined the order of cations (Na+ > Ca2+ > Mg2+ > K+) and anions (Cl– > SO42– > HCO3–). High values of the variation coefficient (CV) correspond to the concentration of potassium, sodium and chloride ions (CV: 68.7, 64.7 and 64 respectively). To identify the hydrochemical water facies, the Piper diagram was used. It was found that 53% of the water samples belong to the Na-Cl type and 40% are of the Ca-Mg-Cl type, while the rest of the samples are the Ca-Cl type. To identify geochemical processes, it was found that ion exchange processes via chloroalkaline indices 1 and 2 are prevalent between Ca2+, Mg2+ in the groundwater and Na+, K+ in water bearing rocks. To learn more about the processes that led to the concentration of certain ions, such as sodium, it was found that they tend to be of silicate minerals related to surface runoff of water in recharge areas and carbonic rocks. It was also found that rock / soil-groundwater interaction and evaporation processes were the formal processes in the saturated zone and evaporation in the unsaturated zone are prevalent processes of groundwater ion concentration.
Źródło:
Journal of Water and Land Development; 2021, 50; 220-228
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Uptake of copper ion using protonated dry alginate beads from dilute aqueous solutions
Autorzy:
Aracena, Alvaro
Álvarez, César
Jerez, Oscar
Guajardo, Nadia
Powiązania:
https://bibliotekanauki.pl/articles/109473.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
removal mechanism
copper ions
alginate beads
pseudo-first order kinetics model
activation energy
Opis:
This research aimed to identify the copper ion removal mechanism when using protonated dry alginate beads. This mechanism was explained through ion exchange between Cu ions and the protons from the functional groups of the alginate beads. Copper removal increased with stirring velocity, reaching values of 97.5 mg g-1 (97.5×10-3 kg/kg of PDAB) of dry alginate at 200 rev min-1, at a solution pH of 6.0 and a run time of 360 min. For the lowest level of copper concentrations, at 10 mg dm-3 (10×10-6 kg dm-3), full removal was attained. The removal kinetics was represented by a pseudo- first order model. A value of 0.0131 min-1 was found for the velocity constant. Under equilibrium conditions, the experiment data was fit to the Langmuir adsorption model, and the highest removal values were 270.3, 222.2 (222.2×10-3 kg/kg of PDAB) and 49 mg g-1 (49×10-3 kg/kg of PDAB) for pH values of 5.0, 3.5 and 2.5, respectively. These are higher than most sorbents used in the literature for copper removal. Increased temperature leads to higher Cu removal. The activation energy was calculated at 9.3 kJ mol-1 for the temperature range of 283 to 343K. Observations using SEM and composition measurements of the alginate cross-section taken by EDS showed a uniform distribution of the copper concentration through the structure of the alginate beads, independent of the solution pH, contact time and temperature.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 732-744
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Removal of zinc, cadmium and nickel from mining waste leachate using walnut shells
Autorzy:
Ayala, Julia
Fernandez, Begona
Powiązania:
https://bibliotekanauki.pl/articles/208277.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metal ions
adsorption
biosorption
adsorbent
kinetics
copper
jony metali
adsorpcja
biosorpcja
kinetyka
miedź
Opis:
The removal of heavy metals from aqueous solutions using walnut shells was investigated. The effects of pH, contact time, initial metal concentration, adsorbent concentration, and co-ions were studied in synthetic solutions. Metal uptake was found to be dependent on the initial pH of the solution; the removal rate increased upon increasing pH, showing the highest affinity at pH 5–7. The amount of metal removed improved with increasing initial concentration. Increasing adsorbent dosage enhanced removal efficiency, but reduced the amount absorbed per unit mass of walnut shells. The presence of co-ions suppressed the uptake of heavy metals, divalent ions having a more negative effect than monovalentions. The adsorption of Zn, Cd and Ni onto walnut shells was found to fit Langmuir and Freundlich isotherms. The results obtained in the tests with mining waste leachate showed the potential use of walnut shells for the removal of heavy metals.
Źródło:
Environment Protection Engineering; 2019, 45, 2; 141-158
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
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:
Cu(II), Co(II), Ni(II), Mn(II) and Zn(II) Schiff base complexes of 3-hydroxy-4-[N-(2-hydroxynaphthylidene)-amino]-naphthalene-1-sulfonic acid: Synthesis, Spectroscopic, thermal, and antimicrobial studies
Autorzy:
Bakare, Safyah B.
Powiązania:
https://bibliotekanauki.pl/articles/778830.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Schiff base
hydroxynaphthalene-1-sulfonic acid
hydroxy-1-naphthaldehyde
transition metal ions
morphology
antimicrobial activity
Opis:
Five divalent transition metals Cu(II), Co(II), Ni(II), Mn(II) and Zn(II) complexes have been synthesized using 3-hydroxy-4-[N-(2-hydroxynaphthylidene)-amino]-naphthalene-1-sulfonic acid (H3L) Schiff base as a ligand derived from the condensation reaction between 4-amino-3-hydroxynaphthalene-1-sulfonic acid and 2-hydroxy-1-naphthalde-hyde. The synthesized complexes were characterized using microanalytical, conductivity, FTIR, electronic, magnetic, ESR, thermal, and SEM studies. The microanalytical values revealed that the metal-to-ligand stoichiometry is 1:1 with molecular formula [M2+(NaL)(H2O)x].nH2O (where x = 3 for all metal ions except of Zn(II) equal x = 1; n = 4, 10, 7, 4, and 6 for Cu(II), Co(II), Ni(II), Mn(II) and Zn(II), respectively). The molar conductivity result indicates that all these complexes are neutral in nature with non-electrolytic behavior. Dependently on the magnetic, electronic, and ESR spectral data, octahedral geometry is proposed for all the complexes except to zinc(II) complex is tetrahedral. Thermal assignments of the synthesized complexes indicates the coordinated and lattice water molecules are present in the complexes. SEM micrographs of the synthesized complexes have a different surface morphologies. The antimicrobial activity data show that metal complexes are more potent than the parent ligand.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 3; 26-34
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Mathematical modeling of the aeroion mode in a car
Autorzy:
Biliaiev, Mykola
Pshinko, Oleksandr
Rusakova, Tetiana
Biliaieva, Viktoriia
Sładkowski, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/2203882.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
negative ions
car ionizer
mathematical modeling
car passenger
comfort
jony ujemne
jonizator samochodowy
modelowanie matematyczne
pasażer
komfort
Opis:
In this study, a mathematical method is proposed for calculating the concentration field of air ions of different polarities and dust levels in the passenger compartment, taking into account the geometry of the passenger compartment and seats, shelves, and other internal elements of the passenger compartment. The method also takes into account changes in the rate of the air flow ventilation, the location and number of ionizers, and sources of positive ions and dust, taking into account their different intensities and locations. On the basis of a numerical model for this method, software has been developed that allows users to carry out computational experiments without requiring much time for calculation. Based on the results, the optimal location of the ionizer in the passenger compartment of the car was determined to ensure comfortable conditions for the stay of passengers, which favorably affects their health. It has been found that the presence of two ionizers is optimal for creating comfort in the car with an ionization intensity of Qn= 0.47 ×1010 ions/s located at the top of the car. If there is one ionizer located on the dashboard or at the top of the car with a higher ionization rate than ions/s, it is not possible to simultaneously provide optimal ionization parameters for passengers in the front and rear seats of the car.
Źródło:
Transport Problems; 2022, 17, 2; 19--32
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 250

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