Investigation of uptake properties heavy metal ion of some ion-exchanger resins

SUMMARY Investigation of Uptake Properties Heavy Metal Ion of Some Ion-Exchanger Resins There have been numerous studies on the sorption of metals from aqueous solutions by synthetic polymers as ion exchanger. Such polymers derived from polystyrene and divinyl benzene are potentially useful as sorbent materials for collecting various metal ions in industrial and analytical applications. Ion our studies, we have used Polydimethylsiloxane macro-azo-initiator (MI-PDMS), polyethyleneglycol dimethylmethacrylate (PEG-DM) and polycaprolacton dimethylmethacrylate (PCL-DM) cross linker monomers instead of divinyl benzene the most widely used as a cross-linked to obtain cross-linked ion exchanger block copolymers. The ion exchange properties of the ion exchanger resins have been investigated from several different view points. The swelling of cross-linked R-PDMS-b- PS (1-5), R-DM-(400-35000), R-MIM- 1500. R-S-MI-1500-PEG-PMMA, R-PC1 DM-(1250, 2000) in water, toluen and chloroform were studied in room temperature. The ion exchange capacity of R-PDMS-PS (1-5), R-DM- (400-35000), R-MIM-1500, R-S-PS-PMMA and R-PCL-DM-1250, 2000 ion exchanger resins were investigated by volumetric and potentiometric methods. These ion exchanger resins were used in the adsorption/desorption studies. Adsorption capacity and the equilibrium concentration of the ion exchangers for the selected metal ions, i.e., Pb2+, Cd +, Co +, Cr3+ were investigated in aqueous media containing different amounts of these ions (1-30 ppm) and different pH values (1-11). Distribution ratio (D) and competitive ion exchange of the exchangers were from a decrease in the metal ion concentration in the aqueous phase. Desorption of metal ions were studied by using 0.1 M HN03 (pH = 1.0) for Pb2+, Cd2+, Co2+, Cr3+ ions. Key words : Polystyrenepolyethylenglycol dimethacrylate, Distribution ratio, A.A.S., Adsorption capacity, Ion exchange. VIII