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• 环境科学 • 上一篇    下一篇

固定化细菌对Pb2+和Cd2+吸附的热力学和动力学研究

郭平, 康春莉, 包国章, 王瑾   

  1. 吉林大学 环境与资源学院, 长春 130012
  • 收稿日期:2006-03-31 修回日期:1900-01-01 出版日期:2006-11-26 发布日期:2006-11-26
  • 通讯作者: 郭平

Thermodynamics and Kinetics of Pb2+and Cd2+ Adsorption onto Immobilized Dominant Bacteria

GUO Ping, KANG Chunli, BAO Guozhang, WANG Jin   

  1. College of Environment and Resources, Jilin University, Changchun 130012, China
  • Received:2006-03-31 Revised:1900-01-01 Online:2006-11-26 Published:2006-11-26
  • Contact: GUO Ping

摘要: 将天然水体中吸附Pb2+和Cd2+的优势菌种固定化后进行吸附规律 研究. 结果发现, 固定化细菌对重金属吸附的动力学过程包括快速阶段和慢速阶段, 其中 慢 速阶段符合二级吸附速率方程. Elovich模型和双常数速率模型不能描述固定化细菌对Pb 2+吸附的动 力学过程, 但能很好描述固定化细菌对Cd2+吸附的动力学过程. 固定化细菌对重金 属吸附热力学过程均可以用Henry模型描述, 且其对Pb2+的亲和力比对Cd2+的 亲和力强.

关键词: 固定化, 吸附, 动力学模型, 热力学模型, Pb2+, Cd2+

Abstract: The adsorption rule of Pb2+; and Cd2+ onto immobilized dominating bacteria in natural water was studied. The results show that the adsorption dynamic process of the heavy metals onto immobilized bacteria includes a fast stage and a slow stage; the latter conforms to secondlevel adsorption rate equation. The Elovich model and the rate model with two constants cannot describe the dynamics process of the Pb2+;adsorption onto immobilized bacteria, but can describe the Cd2+ adsorption very well. The Henry model can describe the thermodynamics process of heavy metal adsorption, and the affinity for Pb2+; is stronger than for Cd2+.

Key words: immobilization, adsorption, dynamic model, thermodynamic model, Pb2+, Cd2+

中图分类号: 

  • X132