Adsorption of Cu2+, Zn2+ and Cd2+ on bacillus subtilis

被引：0

作者：

National Engineering Research Center for Distillation Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China ^{[1
]}

不详 ^{[2
]}

机构：

来源：

Trans. Tianjin Univ. | 2006年 / 2卷 / 104-108期

关键词：

Absorption - Biomass - Heavy metals - Ions - Isotherms - Kinetic theory - Mathematical models;

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摘要：

A process of biosorption of Cu2+, Zn2+ and Cd2+ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast. The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models: the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass. The results show that both the Ritchie second-order and modified secondorder equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu2+ and Zn2+ on B. subtilis. The experimental data points of adsorption Cd2+ and Zn2+ on B. subtilis are described by Freundlich isotherms model.

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