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

Lakshika Weerasundara; Yong Sik Ok; Prasanna Kumarathilaka; Alla Marchuk; Jochen Bundschuh

doi:10.1016/j.scitotenv.2022.158877

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

Lakshika Weerasundara, Yong Sik Ok, Prasanna Kumarathilaka, Alla Marchuk, Jochen Bundschuh

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

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 surface 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 1^st, 2^nd, 3^rd, 4^th and 5^th adsorption respectively. Because of this re-usable capability, the As(V) adsorption capacity is not a single value from one adsorption 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.

Original language	English
Article number	158877
Journal	Science of the Total Environment
Volume	855
DOIs	https://doi.org/10.1016/j.scitotenv.2022.158877
Publication status	Published - 2023 Jan 10

Bibliographical note

Funding Information:
The authors acknowledge the support from Katelynn Hadzi at the University of Southern Queensland, Anya J. E. Yago, Dr. Craig Stoppiello and Dr. Lachlan Casey at the Centre for Microscopy and Microanalysis (CMM) at the University of Queensland.

Funding Information:
This work was supported by the University of Southern Queensland , QLD, Australia (RTP Stipend Scholarship programme).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

Adsorption
Arsenic(V)
Chitosan
FeO nanoparticles
Hydrogel

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution

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10.1016/j.scitotenv.2022.158877

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Weerasundara, L., Ok, Y. S., Kumarathilaka, P., Marchuk, A., & Bundschuh, J. (2023). 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. Science of the Total Environment, 855, Article 158877. https://doi.org/10.1016/j.scitotenv.2022.158877

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. / Weerasundara, Lakshika; Ok, Yong Sik; Kumarathilaka, Prasanna et al.
In: Science of the Total Environment, Vol. 855, 158877, 10.01.2023.

Research output: Contribution to journal › Article › peer-review

Weerasundara, L, Ok, YS, Kumarathilaka, P, Marchuk, A & Bundschuh, J 2023, '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', Science of the Total Environment, vol. 855, 158877. https://doi.org/10.1016/j.scitotenv.2022.158877

Weerasundara L, Ok YS, Kumarathilaka P, Marchuk A, Bundschuh J. 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. Science of the Total Environment. 2023 Jan 10;855:158877. doi: 10.1016/j.scitotenv.2022.158877

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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 surface 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 adsorption respectively. Because of this re-usable capability, the As(V) adsorption capacity is not a single value from one adsorption 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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AU - Marchuk, Alla

AU - Bundschuh, Jochen

N1 - Funding Information: The authors acknowledge the support from Katelynn Hadzi at the University of Southern Queensland, Anya J. E. Yago, Dr. Craig Stoppiello and Dr. Lachlan Casey at the Centre for Microscopy and Microanalysis (CMM) at the University of Queensland. Funding Information: This work was supported by the University of Southern Queensland , QLD, Australia (RTP Stipend Scholarship programme). Publisher Copyright: © 2022 Elsevier B.V.

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N2 - 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 surface 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 adsorption respectively. Because of this re-usable capability, the As(V) adsorption capacity is not a single value from one adsorption 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.

AB - 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 surface 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 adsorption respectively. Because of this re-usable capability, the As(V) adsorption capacity is not a single value from one adsorption 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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