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Published on: December 5, 2019
[Biosorption properties of extracellular polymeric substances produced by sulfate-reducing bacteria towards Cu(II)
Di Fang1, Rui-Chang Zhang, Yang-Guo Zhao
1Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China. dfang@ouc.edu.cn
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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