Arsenate removal from aqueous solution using chitosan-coated bentonite, chitosan-coated kaolinite and chitosan-coated sand: parametric, isotherm and thermodynamic studies

doi:10.2166/wst.2018.339

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Title:	Arsenate removal from aqueous solution using chitosan-coated bentonite, chitosan-coated kaolinite and chitosan-coated sand: parametric, isotherm and thermodynamic studies
Authors:	Futalan, Cybelle M. Huang, Yu-Shen Chen, Jheng-Hong Wan, Meng-Wei
Contributors:	Natl Res Ctr Disaster Free & Safe Ocean City Chia Nan Univ Pharm & Sci, Dept Environm Engn & Sci Natl Cheng Kung Univ, Dept Resources Engn Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
Keywords:	arsenate bentonite chitosan kaolinite sand thermodynamics
Date:	2018-08
Issue Date:	2019-11-15 15:45:53 (UTC+8)
Publisher:	IWA PUBLISHING
Abstract:	In the present work, the removal efficiency of As(V) from aqueous solution using chitosan-coated bentonite (CCB), chitosan-coated kaolinite (CCK) and chitosan-coated sand (CCS) was evaluated. The chitosan-based adsorbents were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, the Brunauer-Emmett-Teller method and thermogravimetric analysis. Kinetic studies revealed that As(V) uptake using CCB, CCK and CCS fitted well with the pseudo-second order equation (R-2 >= 0.9847; RMSE <= 9.1833). Equilibrium data show good correlation with the Langmuir model (R-2 >= 0.9753; RMSE <= 8.5123; SSE <= 16.2651) for all adsorbents, which implies monolayer coverage onto homogenous energy sites. The Langmuir adsorption capacity for As (V) at pH 7.0 was determined to be 67.11, 64.85, and 16.78 mg/g for CCB, CCK and CCS, respectively. Thermodynamic studies show that As(V) uptake is exothermic in nature using CCK and endothermic using CCB and CCS. Moreover, adsorption of As(V) was feasible and spontaneous for CCB and CCS at 298 to 328 K. Results show that CCB is the most effective adsorbent in the removal of As(V) from water due to its high surface area and large pore diameter.
???metadata.dc.relation.uri???:	http://dx.doi.org/10.2166/wst.2018.339
Relation:	Annals of Dermatology, v.78, n.3, pp.676-689
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles [Dept. of Environmental Resources Management] Periodical Articles

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