趋磁细菌对Au(III)和Cu(II)的吸附平衡及动力学研究

CIESC Journal

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趋磁细菌对Au(III)和Cu(II)的吸附平衡及动力学研究

宋慧平¹; 李鑫钢¹; 孙津生¹; 尹晓红²; 王艳红¹; 武振华¹

¹ National Engineering Research Center of Distillation Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
² School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300191, China

收稿日期:2007-01-08 修回日期:1900-01-01 出版日期:2007-12-28 发布日期:2007-12-28
通讯作者: 宋慧平

Biosorption equilibrium and kinetics of Au(III) and Cu(II) on magnetotactic bacteria

SONG Huiping¹; LI Xingang¹; SUN Jinsheng¹; YIN Xiaohong²; WANG Yanhong¹; WU Zhenhua¹

¹ National Engineering Research Center of Distillation Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
² School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300191, China

Received:2007-01-08 Revised:1900-01-01 Online:2007-12-28 Published:2007-12-28
Contact: SONG Huiping

摘要/Abstract

摘要： Magnetotactic bacteria (MTB) as biosorbents for the adsorption of Au(III) and Cu(II) ions from aqueous solution have been investigated. The optimum adsorption conditions for both metal ions were the initial pH scope of 1—5.5 for Au(III) and 2.0—4.5 for Cu(II), room temperature, biomass concentration of 10.0g•L－1 and sorption duration more than 10 min. When the initial metal concentration were within 500mg•L－1, the maximum biosorption capacity of 1.0g of MTB (dry mass basis) for Au(III) and Cu(II) were calculated as 505.2mg of Au(III) and 493.1mg of Cu(II) by Langmuir model in single system, respectively. The isotherm equilibrium of Au(III) and Cu(II) ions in the Au-Cu binary system reflected a unique phenomenon that the adsorption of Au(III) was reinforced and that of Cu(II) prohibited, compared respectively with their performances in the single metal system. When the concentration of Au(III) and Cu(II) were below 80mg•L－1, the wastewater after MTB treating was below 1.0mg•L－1, which is in conformity with Environmental Performance Standards (EPS) of Canada. Besides, all the kinetic data were fitted well to the pseudo second-order kinetic model with a high correlation coefficient (R2＞0.999).

关键词: magnetotactic bacteria;selective adsorption;adsorption equilibrium;adsorption kinetics;Au(III)

Abstract: Magnetotactic bacteria (MTB) as biosorbents for the adsorption of Au(III) and Cu(II) ions from aqueous solution have been investigated. The optimum adsorption conditions for both metal ions were the initial pH scope of 1—5.5 for Au(III) and 2.0—4.5 for Cu(II), room temperature, biomass concentration of 10.0g•L－1 and sorption duration more than 10 min. When the initial metal concentration were within 500mg•L－1, the maximum biosorption capacity of 1.0g of MTB (dry mass basis) for Au(III) and Cu(II) were calculated as 505.2mg of Au(III) and 493.1mg of Cu(II) by Langmuir model in single system, respectively. The isotherm equilibrium of Au(III) and Cu(II) ions in the Au-Cu binary system reflected a unique phenomenon that the adsorption of Au(III) was reinforced and that of Cu(II) prohibited, compared respectively with their performances in the single metal system. When the concentration of Au(III) and Cu(II) were below 80mg•L－1, the wastewater after MTB treating was below 1.0mg•L－1, which is in conformity with Environmental Performance Standards (EPS) of Canada. Besides, all the kinetic data were fitted well to the pseudo second-order kinetic model with a high correlation coefficient (R2＞0.999).

Key words: magnetotactic bacteria, selective adsorption, adsorption equilibrium, adsorption kinetics, Au(III)

宋慧平, 李鑫钢, 孙津生, 尹晓红, 王艳红, 武振华. 趋磁细菌对Au(III)和Cu(II)的吸附平衡及动力学研究[J]. CIESC Journal.

SONG Huiping, LI Xingang, SUN Jinsheng, YIN Xiaohong, WANG Yanhong, WU Zhenhua. Biosorption equilibrium and kinetics of Au(III) and Cu(II) on magnetotactic bacteria[J]. .

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趋磁细菌对Au(III)和Cu(II)的吸附平衡及动力学研究

Biosorption equilibrium and kinetics of Au(III) and Cu(II) on magnetotactic bacteria

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