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
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.
Key words：Biosorption;Sulfate-reducing bacteria;Extracellular polymeric substances;Cu2+;Waste water treatment
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