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

doi:10.3390/molecules24132464

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標題:	Treatment of Contaminated Groundwater via Arsenate Removal Using Chitosan-Coated Bentonite
作者:	Yee, Jurng-Jae Justo Arida, Carlo Vic Futalan, Cybelle Morales Daniel Garrido de Luna, Mark Meng-Wei Wan(萬孟瑋)
貢獻者:	Dong A Univ, Dept Architectural Engn Environm Management Bur, Dept Environm & Nat Resources Dong A Univ, Natl Res Ctr Disaster Free & Safe Ocean City Univ Philippines Diliman, Dept Chem Engn Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
關鍵字:	activation energy arsenic bentonite chitosan groundwater thermodynamics
日期:	2019-07
上傳時間:	2020-07-29 13:47:13 (UTC+8)
出版者:	MDPI
摘要:	In the present research, treatment of contaminated groundwater via adsorption of As(V) with an initial concentration of 50.99 mu g/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 (R-2 > 0.9899; chi(2) <= 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 (R-2 >= 0.9951; chi(2) <= 0.8.33; RMSE <= 4.31) where equilibrium was attained after 60 min. Thermodynamics study shows that the As(V) adsorption is non-spontaneous (Delta G(0) >= 0) and endothermic (Delta H-0 = 8.31 J/mol) that would result in an increase in randomness (Delta S-0 = 29.10 kJ/mol center dot 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.
關聯:	Molecules, v.24, n.13, 2464
顯示於類別:	[環境資源管理系(所)] 期刊論文

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