河北大学学报(自然科学版) ›› 2017, Vol. 37 ›› Issue (5): 523-530.DOI: 10.3969/j.issn.1000-1565.2017.05.012

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灭活面包酵母菌对水溶液中镉离子的吸附特性

代群威1,2,王可1,王岩1,李刚1   

  • 收稿日期:2017-03-10 出版日期:2017-09-25 发布日期:2017-09-25
  • 作者简介:代群威(1978—),男,河南漯河人,西南科技大学教授,博士,主要从事新生污染物安全与调控研究. E-mail:qw_dai@163.com
  • 基金资助:
    国家自然科学基金重点资助项目(41130746);四川省科技厅应用基础研究重点项目(2016JY0213);四川省大学生创新创业训练计划项目(201710619051)

Biosorption of cadmium ions from solution by nonliving Saccharomyces cerevisiae

DAI Qunwei1, 2, WANG Ke1, WANG Yan1, LI Gang1   

  1. 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:2017-03-10 Online:2017-09-25 Published:2017-09-25

摘要: 以灭活面包酵母菌(Saccharomyces cerevisiae)作为生物吸附剂,研究了初始液相pH值、吸附剂质量浓度ρ</sub>a、Cd2+初始质量浓度ρ</sub>0等因素对面包酵母菌吸附Cd2+过程的影响,并进行吸附动力学、等温吸附和SEM/EDS分析.结果表明,较佳吸附条件:pH=4.5~7.0,ρ</sub>a=4.0~6.0 g/L,ρ</sub>0=112.4~224.8 mg/L.吸附动力学分析表明面包酵母菌对Cd2+的吸附是一个快速反应的过程,吸附过程可用准二级动力学模型来描述.等温吸附结果较好地符合Langmuir和Freundlich吸附模型.SEM/EDS分析发现,大量的Cd2+被吸附在细胞表面,这说明灭活面包酵母菌对Cd2+的吸附效果较好.

关键词: 面包酵母菌, 镉离子, 生物吸附, 动力学

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

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