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Citation: SU Chun-Yan, KANG Chun-Li, GUO Ping, DONG De-Ming. Cadmium Adsorption by Extracellular Polymers and Main Components of Superiority Bacteria in Natural Water[J]. Chinese Journal of Applied Chemistry, ;2006, 23(11): 1185-1189. shu

Cadmium Adsorption by Extracellular Polymers and Main Components of Superiority Bacteria in Natural Water

1.
a College of Environment and Resources, Jilin University, Changchun 130023;
2.
b School of Chemical Engineering, Changchun University of Technology, Changchun

Corresponding author: KANG Chun-Li,
Received Date: 11 December 2005
Available Online: 1 March 2006
Fund Project: 国家自然科学基金(20077011) (20077011)吉林大学创新基金(450011022018)资助项目 (450011022018)

The adsorption of cadmium(Ⅱ) on the extracellular polymers of natural biofilm was investigated.The exopolysaccharide and extracellular protein were obtained from the extracellular polymers of superiority bacteria of natural biofilm cultivated in Changchun South Lake.The results show that both Langmuir and Freundlich isotherm equations could describe the thermodynamic adsorption processes of Cd²⁺ on the extracellular polymers,exopolysaccharide and extracellular protein.The existence of Pb²⁺ affects the adsorption of Cd²⁺ while pH affect the adsorption processes.The mechanism of Cd²⁺ adsorption was studied by means of infrared spectra and the functional groups participated in the adsorption were identified.These groups could be acetylamino group(-NHCOCH₃) and amino-group(-NH₂)of protein,hydroxyl group(-OH) of exopolysaccharide,etc.The results show that the biosorption ability of the exopolysaccharide is much higher than that of the extracellular protein in the extracellular polymers
- superiority bacteria,
- extracellular polymer,
- cadmium,
- adsorption
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