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Position: Home > Articles > Adsorption of Cu on Escherichia coli Journal of Agro-Environment Science 2007,26 (06) 2033-2037

大肠杆菌对铜离子的吸附行为研究

作  者:
龚健东;赵炳梓;张佳宝;卢信;陈效民
单  位:
封丘农业生态国家实验站
关键词:
大肠杆菌;Cu~(2+);吸附;Zeta电位
摘  要:
为阐明大肠杆菌Escherichia coli对Cu2+的吸附特性,本文利用批量平衡吸附实验法研究了大肠杆菌对Cu2+的吸附动力学及影响细菌吸附Cu2+的主要影响因子,包括溶液pH、Cu2+初始浓度、细菌初始浓度。结果表明,大肠杆菌的Zeta电位随着溶液中离子强度和Cu2+浓度的增加而降低,说明大肠杆菌对Cu2+的吸附主要是通过静电引力作用;在Cu2+初始浓度为0.01 mmol·L-1的背景溶液中,吸附开始很快,到1h时即达到最大;pH值显著影响大肠杆菌对Cu2+的吸附,在pH值为6时,其吸附量达最大;大肠杆菌对Cu2+吸附量随着菌体浓度、Cu2+浓度增加而增加,用Langmuir吸附等温模型能很好模拟该吸附过程,吸附比率随着Cu2+浓度增加而降低。通过对细菌吸附重金属的特性研究,为环境中重金属污染的生物去除提供一定的理论依据。
译  名:
Adsorption of Cu on Escherichia coli
作  者:
GONG Jian-dong1,2, ZHAO Bing-zi1, ZHANG Jia-bao1, LU Xin1, CHEN Xiao-min2 (1. State Experimental Station for Agro-Ecology, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; 2. College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China)
关键词:
Escherichia coli; Cu2+; adsorption; Zeta potential
摘  要:
Adsorption kinetics of Cu2+ on Escherichia coli and their influencing factors including solution pH, initial Cu2+ concentration and initial bacterial concentration were studied to elucidate the adsorption characteristic of Cu2+ on Escherichia coli using batch equilibrium experiments. The results showed that the zeta potential of Escherichia coli decreased with increase of the ionic strength and the initial Cu2+ concentration, indicating that the adsorption of Cu2+ on Escherichia coli was probably mainly controlled by the electrostatic force. Quick adsorption was observed in solutions with initial Cu2+ of 0.01 mmol·L-1 and the maximum adsorption reached within 1 h. The pH value had significant effect on the Cu2+ adsorption, and the optimal pH for adsorption was 6. Copper adsorption onto the Escherichia coli increased with the concentration of bacteria applied and initial Cu2+ concentration, while the adsorption ratio decreased with initial Cu2+ concentration, which can be simulated by Langmuir isotherm model. These results provided some theoretic basis for effective removal of the heavy metals from the environment by biosorption.

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