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Treatment of Contaminated Groundwater via Arsenate Removal Using Chitosan-Coated Bentonite

1
Department of Architectural Engineering, Dong-A University, Saha-gu, Busan 49315, Korea
2
Environmental Management Bureau, Department of Environment and Natural Resources, Quezon City 1100, Philippines
3
National Research Center for Disaster-Free and Safe Ocean City, Dong-A University, Busan 49315, Korea
4
Department of Chemical Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
5
Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science, Tainan 71710, Taiwan
*
Authors to whom correspondence should be addressed.
Academic Editor: Massimiliano Fenice
Molecules 2019, 24(13), 2464; https://doi.org/10.3390/molecules24132464
Received: 1 June 2019 / Revised: 3 July 2019 / Accepted: 3 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Advances in Chitin and Chitosan Science)
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Abstract

In the present research, treatment of contaminated groundwater via adsorption of As(V) with an initial concentration of 50.99 µg/L using chitosan-coated bentonite (CCB) was investigated. The effect of adsorbent mass (0.001 to 2.0 g), temperature (298 to 328 K), and contact time (1 to 180 min) on the removal efficiency was examined. Adsorption data was evaluated using isotherm models such as Langmuir, Freundlich, and Dubinin-Radushkevich. Isotherm study showed that the Langmuir (R2 > 0.9899; χ2 ≤ 0.91; RMSE ≤ 4.87) model best correlates with the experimental data. Kinetics studies revealed that pseudo-second order equation adequately describes the experimental data (R2 ≥ 0.9951; χ2 ≤ 0.8.33; RMSE ≤ 4.31) where equilibrium was attained after 60 min. Thermodynamics study shows that the As(V) adsorption is non-spontaneous (ΔG0 ≥ 0) and endothermic (ΔH0 = 8.31 J/mol) that would result in an increase in randomness (ΔS0 = 29.10 kJ/mol•K) within the CCB-solution interface. FT-IR analysis reveals that hydroxyl and amino groups are involved in the adsorption of As(V) from groundwater. Results of the present research serve as a tool to determine whether CCB is an environmentally safe and cost effective material that could be utilized in a permeable reactive barrier system for the remediation of As(V) from contaminated groundwater. View Full-Text
Keywords: activation energy; arsenic; bentonite; chitosan; groundwater; thermodynamics activation energy; arsenic; bentonite; chitosan; groundwater; thermodynamics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yee, J.-J.; Arida, C.V.J.; Futalan, C.M.; de Luna, M.D.G.; Wan, M.-W. Treatment of Contaminated Groundwater via Arsenate Removal Using Chitosan-Coated Bentonite. Molecules 2019, 24, 2464.

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