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Study on Biosorption of Copper (II) Ion by Cladosporium sp

DONG Xinjiao,YU Linwei,ZHU Cong(Dept. of Biological & Environmental Science, Wenzhou Normal College, Wenzhou325003,China)  
A strain of anti-cupric bacterium identified Cladosporium sp.was screened from electroplating sludge and pretreated with various concentrations of chemical reagents. The factors affecting the adsorption ability of the fungi and the pretreated fungi on Cu2+, such as initial pH, speed of shaker-bed and the contacting time were studied. The results show that the pretreated biomass with 0.2 mol/L NaOH has the maximum adsorption capacity. The uptake of copper was significantly affected by the initial pH of the solution and speed of shaker-bed. The optimal condition of native fungi and pretreated fungi was pH 4.0 and 5.0 respectively, speed of shaker-bed 100r/min. The adsorption was well accord with Langmuir isotherm under the concentration of Cu2+ 10~150mg/L. In the process of biosorption, pH changed in a certain pattern.
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