Sorption of dibasic acids on weak base resins

Abstract

Higher rates of uptake of dibasic acids by weak base anion exchange resins, in comparison to those of monobasic acid, have beeen satisfactorily explained on the basis of dual site adorption of divalent anion on the protonated resin sites. Due to dual site sorption, divalent anions are strongly bound to the resin matrix, thereby neutralizing the positive charges on the protonated pore surface. Hence, there is practically no exclusion of co-ions from the pores of the resin. The extent of reversibility of sorption is considerably less as a result of less repulsion of H + ions from the pore surface than that observed in monobasic acids.