自然水体生物膜胞外多糖吸附铅和镉的研究

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

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

Abstract

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

CLC Number:

X132

KANG Chun-li, SU Chun-yan, DONG De-ming, GUO Ping, ZHAO Yu-xia. Studies on Lead and Cadmium Adsorption by Exopolysaccharide of Natural Biofilm[J].J4, 2005, 43(01): 121-125.

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Studies on Lead and Cadmium Adsorption by Exopolysaccharide of Natural Biofilm

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