| 光谱学与光谱分析 |
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| Biosorption Properties of Extracellular Polymeric Substances Produced by Sulfate-Reducing Bacteria Towards Cu(Ⅱ) Ion |
| FANG Di1,2*, ZHANG Rui-chang2, ZHAO Yang-guo1,2 |
1. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China
2. School of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China |
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Abstract The purpose of the present study was to investigate the Cu2+ biosorption properties of extracellular polymeric substances (EPS) produced by sulfate-reducing bacteria. The composition and physicochemical characteristics of EPS were determined. The adsorption characteristics of EPS towards Cu2+ were examined using thermodynamic equilibrium equations and determined by FTIR and SEM-EDS. The EPS was shown to have a strong copper-binding capacity and the biosorption data obtained were well described by the Freundlich isotherm model. The results of FTIR spectra and SEM-EDS confirmed the importance of the C—O—C group, —OH group and carbonyl group from polysaccharides and proteins in Cu2+ sorption by EPS. These findings suggest the potential of EPS produced by sulfate-reducing bacteria for the removal of Cu(Ⅱ) ion from aqueous solution.
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Received: 2010-12-08
Accepted: 2011-04-09
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Corresponding Authors:
FANG Di
E-mail: dfang@ouc.edu.cn
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