J4

• 环境科学 • 上一篇    

天然水体中优势菌种非活性细胞吸附Pb2+和Cd2+的热力学及动力学研究

郭平, 马小凡, 康春莉, 李军, 王羽, 刘乃喻   

  1. 吉林大学环境与资源学院环境科学系, 长春 130023
  • 收稿日期:2003-11-06 修回日期:1900-01-01 出版日期:2004-10-26 发布日期:2004-10-26
  • 通讯作者: 马小凡

Studies on thermodynamics and kinetics of Pb2+ and Cd2+ adsorption onto dominant dead bacteria in natural water

GUO Ping, MA Xiao-fan, KANG Chun-li, LI Jun, WANG Yu, LIU Nai-yu   

  1. Department of Environmental Science, College of Environment and Resources, Jilin University, Changchun 130023, China
  • Received:2003-11-06 Revised:1900-01-01 Online:2004-10-26 Published:2004-10-26
  • Contact: MA Xiao-fan

摘要: 研究了长春市伊通河天然水体中优势菌种非活性细胞对Pb2+和Cd2+吸附规律, 发现非活性细胞对Pb2+和Cd2+的吸附符合Langm uir和Freundlich热力学方程. 非活性细胞吸附Pb2+和Cd2+的动力学过程分为快速阶段和慢速阶段, 其中慢速阶段符合二级吸附速率动力学方程.

关键词: 优势菌种, 铅(Ⅱ), 镉(Ⅱ), 二级吸附速率方程

Abstract: The adsorption of Cd2+ and Pb2+ onto dominant dead bacteria in natural water was studied. The results show that when Langmuir and Freundlich isotherm models were tried to represent the equilibrium data of Cd2+ and Pb2+ adsorption onto dominant dead bacteria, equilibrium data fitted very well to both the models in the studied concentration range of Cd2+ and Pb2+. The kinetic processes of the adsorption included fast phase and slow phase. Pseudo first-order and pseudo second-order kinetic models were also applied to experimental data on the basis of assuming that the external mass transfer limitations in the system can be neglgected and the adsorption is sorption controlled. The slow phase obeyed the second-order rate expression.

Key words: dominant bacteria, lead(Ⅱ), cadmium(Ⅱ), kinetic models of second-order adsorption

中图分类号: 

  • X132