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Assessment and optimization of As(V) adsorption on hydrogel composite integrating chitosan-polyvinyl alcohol and Fe3O4 nanoparticles and evaluation of their regeneration and reusable capabilities in aqueous media

Authors
Weerasundara, LakshikaOk, Yong SikKumarathilaka, PrasannaMarchuk, AllaBundschuh, Jochen
Issue Date
10-1월-2023
Publisher
ELSEVIER
Keywords
Arsenic(V); Hydrogel; Chitosan; Adsorption
Citation
SCIENCE OF THE TOTAL ENVIRONMENT, v.855
Indexed
SCOPUS
Journal Title
SCIENCE OF THE TOTAL ENVIRONMENT
Volume
855
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/146453
DOI
10.1016/j.scitotenv.2022.158877
ISSN
0048-9697
Abstract
A modified chitosan-polyvinyl alcohol (PVA) hydrogel was developed by incorporating Fe3O4 nanoparticles. Four chitosan-Fe3O4 (ChFe) hydrogel types were developed based on chitosan:Fe3O4 ratio as 1:0, 1:1, 1:0.5 and 1:0.25. Batch sorption experiments were conducted with different pH, dosage, kinetics, and isotherms. The exhausted ChFe hydrogels were evaluated for their regeneration and reuse capability with different acids and bases. The best hydrogel for arsenic (V) [As(V)] adsorption was 1:0.5 ratio ChFe hydrogel. The highest As(V) adsorption (89 %) was at pH 4 and the adsorption capacity gradually decreased with increasing solution pH. Within the pH 4-6 range, the hydrogel sur-face became positively charged due to protonation of\\NH2 and\\OH groups in the polymer chain and the positive surface attracted H2AsO4- and HAsO42-oxyanions. The experimental kinetic data was well -fitted to the Elovich model (R2 of 0.99) while the Freundlich isotherm model best described the isotherm data (R2 of 0.97). The models predicted chemisorption mechanisms on ChFe hydrogel composites. Electrostatic attractions with \\NH3+ and \\OH2+, ligand-exchange inner-sphere complexes formation and bidentate corner-sharing (2C) and bidentate edge-sharing (2E) trimetric surface complexes formation have been proposed as the adsorption mechanism of As(V) into ChFe hydrogel. 0.1 M CH3COOH showed the best regeneration pattern with 75, 96, 81, 53 and 43 % of 1st, 2nd, 3rd, 4th and 5th adsorp-tion respectively. Because of this re-usable capability, the As(V) adsorption capacity is not a single value from one ad-sorption cycle, but a cumulative value of several adsorption cycles and it was 17.39 mg/g for five adsorption cycles. Open for regeneration and reuse, no post-treatment is needed for adsorbent-water separation, allow applications of the ChFe hydrogel composite in a wide range of applications such as water filtration and purification systems. The modification with ChFe further expands the application capacity since the ChFe can remove other contaminants as well.
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College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles

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