Removal of ammonium-nitrogen from aqueous solution using chitosan-coated bentonite: Mechanism and effect of operating parameters

doi:10.1002/APP.45924

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Title:	Removal of ammonium-nitrogen from aqueous solution using chitosan-coated bentonite: Mechanism and effect of operating parameters
Authors:	de Luna, Mark Daniel G. Futalan, Cybelle M. Jurado, Climaco A., Jr. Colades, James I. Wan, Meng-Wei
Contributors:	Univ Philippines, Dept Chem Engn Natl Res Ctr Disaster Free & Safe Ocean City Environm Management Bur Reg III, San Fernando City Univ Philippines, Natl Grad Sch Engn, Environm Engn Program Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
Keywords:	adsorption biodegradable kinetics polysaccharides
Date:	2018-03-05
Issue Date:	2019-11-15 15:48:33 (UTC+8)
Publisher:	WILEY
Abstract:	Wastewater containing high concentration of ammonium-nitrogen (NH4+-N) is not effectively addressed by biological treatment and when released into water bodies can cause eutrophication. In this study, the removal of NH4+-N from simulated wastewater using chitosan-coated bentonite (CCB) was investigated. The effects of NH4+ salt used, pH, CCB dosage, agitation rate, and temperature on the removal of NH4+-N were studied. The highest NH4+-N removal of 67.5% was attained at the following conditions: initial pH 4.0, CCB dose of 8.0 g, agitation rate of 150 rpm, and temperature of 35 degrees C. Fourier transform infrared analysis indicated two mechanisms: NH4+-N adsorption onto CCB involving hydrogen bonding with hydroxyl groups (-OH) and ion exchange between NH4+-N and cations present in the interlayer of bentonite. Experimental data follows the pseudo-second-order kinetic model (R-2=0.9964) and Koble-Corrigan isotherm (R 250.9705). Thermodynamic studies showed that the adsorption process is spontaneous (Delta G degrees < 0), endothermic (Delta H degrees > 0) in nature, and leads to an increase in randomness at the solid-solution interface (Delta S degrees > 0). (C) 2017 Wiley Periodicals, Inc.
???metadata.dc.relation.uri???:	http://dx.doi.org/10.1002/APP.45924
Relation:	Environmental Microbiology, v.135, n.9, 45924
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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