灭活面包酵母菌对水溶液中镉离子的吸附特性

doi:10.3969/j.issn.1000-1565.2017.05.012

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

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 Qunwei^{1, 2}, WANG Ke¹, WANG Yan¹, LI Gang¹

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/Abstract

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_{__a、Cd²⁺初始质量浓度ρ_{_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_{__a=4.0~6.0 g/L,ρ_{_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_{__a, initial concentration of Cd²⁺ ρ_{_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_{__a=4.0~6.0 g/L, ρ_{_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

中图分类号:

X703

代群威,王可,王岩,李刚. 灭活面包酵母菌对水溶液中镉离子的吸附特性[J]. 河北大学学报(自然科学版), 2017, 37(5): 523-530.

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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灭活面包酵母菌对水溶液中镉离子的吸附特性

Biosorption of cadmium ions from solution by nonliving Saccharomyces cerevisiae

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