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

Abstract

An extracellular polysaccharide (EPS) produced by the gramnegative nonpathogenic rhizosphere bacteria Enterobacter cloacae K7 was isolated and characterized. The process of biosorption of Cu(II) cations from aqueous solution by the isolated exopolysaccharides was investigated. The maximum sorption capacity 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