J4

• 环境科学 • 上一篇    

自然水体生物膜胞外多糖吸附铅和镉的研究

康春莉, 苏春彦, 董德明, 郭 平, 赵宇侠   

  1. 吉林大学环境与资源学院, 长春 130023
  • 收稿日期:2004-06-07 修回日期:1900-01-01 出版日期:2005-01-26 发布日期:2005-01-20
  • 通讯作者: 董德明

Studies on Lead and Cadmium Adsorption by Exopolysaccharide of Natural Biofilm

KANG Chun-li, SU Chun-yan, DONG De-ming, GUO Ping, ZHAO Yu-xia   

  1. College of Environment and Resources, Jilin University, Changchun 130023, China
  • Received:2004-06-07 Revised:1900-01-01 Online:2005-01-26 Published:2005-01-20
  • Contact: DONG De-ming

摘要: 采用长春南湖水中优势菌种胞外多糖分别对Pb2+和Cd2+进行吸附实验, 从离子浓度、 温度、 时间、 pH值、 铅镉共存等方面对其吸附规律进行了初步研究, 结果表明, Langmuir和Freundlich方程均可描述自然水体生物膜胞外多糖吸附 Pb2+和Cd2+的热力学过程. 胞外多糖吸附Pb2+和Cd2+的动力学吸附特征符合Langmuir-Hinshelwood方程的一级反 应模式.Cd2+干扰胞外多糖对Pb2+的吸附, Pb2+也干扰胞外多糖对Cd2+的吸附.

关键词: 生物膜, 胞外多糖, 吸附, 铅,

Abstract: The adsorption of lead(Ⅱ) and cadmium(Ⅱ) on the exopolysaccharide of natural biofilm was investigated. The exopolysaccharide was obtained from the extracellular polymers of superiority bacteria in Changchun South Lake. The results show that both Langmuir and Freundlich isotherm equations could describe the thermodynamics adsorption processes of Pb and Cd on the exopolysaccharide. One order kinetic model of Langmuir-Hinshelwood equation could describe the kinetic adsorption characteristics of heavy metals.The existence of Cd affects the adsorption of Pb, and Pb also affects the adsorption of Cd. Temperature and pH value could also affect the adsorption processes.

Key words: biofilm, exopolysaccharide, adsorption, lead, cadmium

中图分类号: 

  • X132