Adsorption Studies of Copper Sulfate on Hydrogels of Poly(Amido-Amines)

Abstract

Abstract The interaction between the active groups of polymeric gels of poly(amido-amines) such as poly(acrylamide-diallyldiethyl ammonium chloride) “cationic gel p(AM-DADEAmCl)” and poly(acrylamide-sodium acrylate-diallyldiethyl ammonium chloride) “amphoteric gel p(AM-AANa-DADEAmCl” with copper sulfate have been carried out by using polymeric gels of different swelling degree and different amine percent. The capacity toward cations decreases with increasing the amine percent and the swelling degree but the capacity toward anions such as (SO4) 2- decreases with increasing swelling degree and increases with increasing the amine percent. These polymeric gels interact with copper sulfate at pH value >5 to form a crosslinked structures. Spectroscopic studies showed that the mechanism of crosslinking formation is a bond formation between the active group of polymeric chains and copper sulfate. The bond formation depends on the nature of the polymer chain. It was also found that the amide groups form complexes with hydrated cations, while both carboxylate and ammonium groups interact by ion-exchange mechanisms.