Removal of Cu(II) from Aqueous Solutions Using Modified Amberlite XAD-7HP Polymeric Resin as an Adsorbent

Abstract

The removal of Cu(II) from aqueous solutions by using modified Amberlite XAD-7HP resin was investigated. The modified resin was prepared by complete mixing of Amberlite XAD-7HP resin with sodium dioctyl sulphosuccinate (SDOSS-anionic surfactant) and EDTA in an aqueous solution. The effect of contact time, pH, modified resin dosage and initial metal ion concentration on the removal of Cu(II) were studied in a batch process mode. The optimum pH required for maximum removal of Cu(II) was found to be 5. The data were fitted with the Langmuir and Freundlich equations to describe the equilibrium isotherms. The maximum adsorption capacity of Cu(II) on modified resin was found to be 34.87 mg/g. Adsorption kinetics data were modelled using the pseudo-first and pseudo-second-order models. The results indicate that the pseudosecond- order model best describes adsorption kinetic data. The modified resin was regenerated by using 5 % NaCl and used again to remove Cu(II) ions. The efficiency of modified resin was also tested with synthetic industrial wastewater and has considerable adsorption capacity.