Abstract
Biosorption of cadmium and lead from aqueous solution was investigated using green algae Chlorella vul- garis at room temperature and at pH adjusted to 7.0. Vari- ous sorption parameters such as contact time, initial metal ion concentration and biomass quantity were studied. The equilibrium experimental data are well represented by Lang- muir model among two-parameter models. It was noted that the maximum adsorption capacity for cadmium and lead was 149.9 and 178.5 mg (metal) g −1 biomass, respectively. The kinetic data were fitted by models including pseudo- first order and pseudo-second order. It was observed that, the pseudo-first-order kinetic model describes the biosorption of cadmium and lead ions onto C. vulgaris biomass.
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