Journal of Hebei University(Natural Science Edition) >

2017 , Vol. 37 >Issue 5: 523 - 530

DOI: https://doi.org/10.3969/j.issn.1000-1565.2017.05.012

Biosorption of cadmium ions from solution by nonliving Saccharomyces cerevisiae

  • DAI Qunwei ,
  • WANG Ke ,
  • WANG Yan ,
  • LI Gang
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  • 1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China; 2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Mianyang 621010, China

Received date: 2017-03-10

  Online published: 2017-09-25

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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

Cite this article

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 . DOI: 10.3969/j.issn.1000-1565.2017.05.012

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