Biosorption of cadmium ions from solution by nonliving Saccharomyces cerevisiae

doi:10.3969/j.issn.1000-1565.2017.05.012

Abstract

Abstract: The nonliving Saccharomyces cerevisiae was utilized as biosorbent to remove Cd²⁺ from aqueous solution.The effects of initial pH, amount of adsorbent ρ_{_</sub>_a, initial concentration of Cd²⁺ ρ_{_</sub>₀ on the adsorption efficiency of Cd²⁺ were studied. Meanwhile, the adsorption kinetics, isotherm biosorption and SEM/EDS were investigated. The results indicated that the optimum condition for biosorption were as follows: pH=4.5~7.0, ρ_{_</sub>_a=4.0~6.0 g/L, ρ_{_</sub>₀=112.4~224.8 mg/L. The analysis of adsorption kinetics showed that the biosorption of Cd²⁺ by Saccharomyces cerevisiae was a rapid process.The biosorption process could be fitted with the pseudo-second-order kinetic model. The isotherm adsorption curve of Cd²⁺ on baker’s yeast accorded well with Langmuir and Freunlich model. Through SEM/EDS analysis, we can see that baker’s yeast cell surface tends to absorb large amounts of Cd²⁺ after being adsorbed for 1 440 minutes.As a consequence,nonliving Saccharomyces cerevisiae have a high biosorption efficiency for Cd²⁺.}}}}

Key words: Saccharomyces cerevisiae, cadmium ions, biosorption, kinetics

CLC Number:

X703

DAI Qunwei, WANG Ke, WANG Yan, LI Gang. Biosorption of cadmium ions from solution by nonliving Saccharomyces cerevisiae[J]. Journal of Hebei University (Natural Science Edition), 2017, 37(5): 523-530.

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