1. College of Environmental Science, Anhui Normal University, Wuhu 241000, China; 2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3. College of Resource and Environment, Southwest University, Chongqing 400716, China
The biosorption of Cd2+ and Cu2+ onto the immobilized Saccharomyces cerevisiae (S. cerevisiae) was investigated in this study. Adsorption kinetics, isotherms and the effect of pH were studied. The results indicated that the biosorption of Cd2+ and Cu2+ on the immobilized S. cerevisiae was fast at initial stage and then became slow. The maximum biosorption of heavy metal ions on immobilized S. cerevisiae were observed at pH 4 for Cd2+ and Cu2+. by the pseudo-second-order model described the sorption kinetic data well according to the high correlation coefficient (R2) obtained. The biosorption isotherm was fitted well by the Langmuir model, indicating possible mono-layer biosorption of Cd2+ and Cu2+ on the immobilized S. cerevisiae. Moreover, the immobilized S. cerevisiae after the sorption of Cd2+ and Cu2+ could be regenerated and reused.
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