趋磁细菌对金属离子的吸附特性研究  

Study on Adsorption of Metal Ions by Magnetotactic Bacteria

作　　者：宋慧平[1] 李鑫钢[1] 孙津生[1] 武振华[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《化学反应工程与工艺》2006年第6期486-491,共6页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金资助项目(20206024)

摘　　要：研究了单元体系和三元体系中趋磁细菌(MTB)对Au3+,Cu2+和Ni2+的吸附特性,用Langmuir吸附等温模型拟合了吸附等温线实验数据。较高的相关系数表明该吸附过程可以用Langmuir模型来描述。在三元体系竞争吸附实验中,MTB对Au3+的吸附量较之单元系统有所增加,而Cu2+和Ni2+的吸附量明显降低。吸附动力学实验结果表明,MTB对三种金属离子的吸附都属于快速过程,对Au3+的吸附在短时间内可完成,而且几乎完全吸附。所有吸附过程均符合拟二阶动力学模型。Adsorption of Au （Ⅲ）, Cu （Ⅱ） and Ni （Ⅱ） ions from aqueous solution by magnetotactic bacteria （MTB） in single and ternary systems had been investigated. The experimental results showed that competitive biosorption from ternary component systems was a boost in adsorption of Au （Ⅲ）, while a significant inhibition for Cu （Ⅱ） and Ni （Ⅱ）. Langmuir model was used to analyze the equilibrium isotherms and model parameters were estimated. Adsorption equilibrium data of Au （Ⅲ）, Cu （Ⅱ） and Ni （Ⅱ） ions were fitted to the Langmuir model with higher correlation coefficients in the single and ternary systems. Kinetics experiment results showed that biosorption was quite fast. The maximum metal uptake of Au （Ⅲ） was obtained quickly. The pseudo second-order adsorption kinetic model was suitable to describe the adsorption kinetic data in single and ternary systems with a high correlation coefficient, which indicated that the chemical sorption was the rate-limiting step. MTB might be proposed as an alternative to more costly traditional methods for removing and recycling of gold from waste water or leaching liquid from solid waste containing Au （Ⅲ） ions.

关 键 词：趋磁细菌 Au离子 吸附 三元体系 

分 类 号：O614.123[理学—无机化学] TQ085.413[理学—化学]