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Citation: SU Chun-Yan, KANG Chun-Li, GUO Ping, DONG De-Ming. Adsorption of Lead(Ⅱ) by Extracellular Polymer of Superiority Bacteria in Natural Water and Its Main Components[J]. Chinese Journal of Applied Chemistry, ;2008, 25(1): 1-4. shu

Adsorption of Lead(Ⅱ) by Extracellular Polymer of Superiority Bacteria in Natural Water and Its Main Components

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

Corresponding author: KANG Chun-Li,
Received Date: 6 February 2007
Available Online: 15 June 2007
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 lead(Ⅱ) on the extracellular polymer of superiority bacteria in natural water and its main components such as the exopolysaccharides and extracellular proteins were investigated.The main components were separated from the extracellular polymers of natural surface coatings cultivated in Changchun Nanhu Lake.The results show that three adsorbents' maximum adsorptive capacities are 23.64,15.8,3.48 mg/g respectively when the solution original pH is 6.Both Langmuir and Freundlich isotherm equations could describe the thermodynamics adsorption processes of Pb on the extracellular polymers,exopolysaccha-rides and extracellular proteins.The existence of Cd affected the adsorption of Pb.The pH value also affected the adsorption processes.The mechanisms of adsorption of Pb were studied by infrared spectroscopy and the functional groups participated in the adsorption were identified,such as acetylamino group(-NHCOCH₃) and amino-group(-NH₂) of protein,hydroxyl group(-OH) of exopolysaccharide,etc.The results show that the biosorption ability of the exopolysaccharides is much higher than that of the extracellular proteins in the extracellular polymers.
- superiority bacteria,
- extracellular polymers,
- adsorption,
- lead
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