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Biosorption of cadmium (II) ions from aqueous solution onto immobilized cells of Saccharomyces cerevisiae was investigated. Equilibrium and kinetic studies were conducted taking into consideration the effect of initial cadmium (II) concentration. The obtained results showed that the uptake of heavy metal increases with an increase of initial cadmium (II) concentration. Langmuir and Freundlich isotherm models were used to analyze the equilibrium data. Based on correlation coefficients, it has been concluded that the Langmuir isotherm is more suitable to describe the cadmium biosorption equilibrium data. First and pseudo-second order kinetic models were applied to describe the biosorption process. It was found that the kinetics data fitted well the pseudo second order model.

Keywords: biosorption, cadmium, Saccharomyces cerevisiae cells, adsorption isotherm, kinetics