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
It is established that the adsorption of lysozyme on silochrome proceeds by a two stage scheme that includes equilibrium adsorption and irreversible multipoint binding, complicated by the association of surface protein. It is shown that, a substantial change in the mechanism of adsorption occurs in dependence on pH. The density of the monolayer increases with increasing pH in the range of 6-10. The rate constants of adsorption and sites occupied by a molecule of protein at different pH values are calculated.
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