Cite this article as:

Grinev V. S., Fedonenko Y. P., Neshko А. А., Kryuchkova E. V., Lyubun E. V., Turkovskaya O. V. Biosorption of Cu (II) by an Exopolysaccharide Isolated from Enterobacter Cloacae K7. Izvestiya of Saratov University. New series. Series: Chemistry. Biology. Ecology, 2015, vol. 15, iss. 1, pp. 61-67.


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UDC: 
579.835: 577.114.083: 577.114.4: 577.114.7: 577.118
Language: 
Russian

Biosorption of Cu (II) by an Exopolysaccharide Isolated from Enterobacter Cloacae K7

Abstract

An extracellular polysaccharide (EPS) produced by the gram- negative nonpathogenic rhizosphere bacteria Enterobacter cloa- cae K7 was isolated and characterized. The process of biosorption of Cu(II) cations from aqueous solution by the isolated exopoly- saccharides was investigated. The maximum sorption capac- ity was 0.17 mM/mg of EPS or 12 g of Cu(II) per g of EPS at pH 5, T = 25 °C, and incubation for 30 min. The experimental values of the adsorption of Cu(II) cations (Qexp) by the biosorbent were comparable to the maximum possible value of adsorption (Qmax = 0.18 mM) calcu- lated by using the Langmuir equation. The degree of affinity between EPS being examined and Cu(II) cations was high (2.04 mmol l1). The obtained data are of practical importance for the development of a technology for the remediation of water bodies from heavy metals. 

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