Removal of some heavy metal cations by synthetic resin purolite C100.

The discharge of heavy metals into aquatic ecosystems has become a matter of concern over the last few decades. These pollutants are introduced into the aquatic systems significantly as a result of various industrial operations. This paper describes the adsorption behaviour of cation exchange resin purolite C100 with respect to Ce(4+), Fe(3+) and Pb(2+) in order to consider its application to purify metal finishing wastewaters. The batch method has been employed, using metal concentrations in solution ranging from 2.65 to 265mg/L. The adsorption percentages (%) and distribution coefficient (K(d)) were determined for the adsorption system in the aqueous media as a function of sorbate concentration. The experimental isotherm data were analyzed using the Langmuir, Freundlich, and Dubinin-Kaganer-Radushkevich (DKR) equations. It was found that the adsorption phenomena depend on charge density and hydrated ion diameter. According to the equilibrium studies, the metal ions sequence can be given as Ce(4+)>Fe(3+)>Pb(2+). These results show that cation exchange resin purolite C100 holds great potential to remove cationic heavy metal species from polluted wastewater.

Chromatographic separations and recovery of lead ions from a synthetic binary mixtures of some heavy metal using cation exchange resin.

A simple solid phase extraction procedure on cation exchange resin Purolite C100 is presented. The procedure based on a column technique for separation and recovery of lead ions from synthetic binary mixtures. Equilibrium distribution coefficient, k(d) for the different metal ions such as Al(III), Fe(III), Ba(II) and Pb(II) in the presence of nitric acid and ammonium acetate solutions of variable concentrations was determined at 25 degrees C. The values of separation factor, alpha were evaluated. Quantitative separation of lead ions from a synthetic binary mixtures are based on the fact that ammonium acetate is a good elute for lead ions but fails to elute the other cations.