Comparative sorption kinetic studies of ammonium onto zeolite

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题名:	Comparative sorption kinetic studies of ammonium onto zeolite
作者:	Wen, D.;Ho, Y.S.;Tang, X.
贡献者:	Department of Biotechnology
关键词:	Natural zeolite;Bio-zeolite;Adsorption;Ion exchange;Kinetic;Pseudo-second order
日期:	2006
上传时间:	2009-12-15 05:25:03 (UTC+0)
出版者:	Asia University
摘要:	The sorption kinetics of ammonium onto three types of zeolite, natural zeolite, natural zeolite covered by biofilm and ammonium-bearing zeolite covered by biofilm, at two particle sizes were studied. The pseudo-first order and pseudo-second order models were fitted to the results by a non-linear method. The batch sorption model, based on a pseudo-second order mechanism, was applied to predict the rate constant of sorption, the equilibrium capacity and the initial sorption rate. Ion exchange between NH4 + and cations in the zeolite increased with decreasing particle size of the zeolite. Biofilm covered on the zeolite did not affect the ion exchange for the smaller particle size but decreased the ion exchange capacity by 22% for the larger particle size. In addition, bioregeneration should be considered for the recovery of ion exchange capacity of the bio-zeolite made from ammonium-bearing zeolite by the microorganisms in the biofilm, 78.0 and 63.9% regeneration for the smaller and larger particle size of zeolite, respectively.
關聯:	Journal of Hazardous Materials 133(1-3): 252-256
显示于类别:	[生物科技學系] 期刊論文

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