期刊
ENVIRONMENT INTERNATIONAL
卷 31, 期 6, 页码 845-854出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envint.2005.05.036
关键词
adsorption; external mass transfer; surface diffusion; metal ions; bone char; multi-component
The sorption of cadmium, copper and zinc from aqueous solutions onto bone char has been studied in both single and binary multicomponent systems. Equilibrium experimental studies have been performed to determine the sorption capacity of bone char for each metal ion. The isotherm results have been analysed using single and multi-component equilibrium models. The rate of sorption of the metal ions onto bone char has been studied using an agitated batch adsorber. The concentration versus time decay curves have been measured and a number of mass transfer models have been developed and tested based on diffusion controlled sorption. The results of the equilibrium and rate studies are presented and discussed in the paper. The possible mechanisms of metal sorption are also discussed. Finally a series of fixed bed column studies have been performed and analysed using a diffusion mass transport model. The experimental results show a displacement effect for the binary metal ion breakthrough curves. (C) 2005 Elsevier Ltd. All rights reserved.
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