Adsorption Properties of Hydroxybenzoic Acids on Amine Modified Polystyrene Resin

Abstract:

A new amine-modified hypercrosslinked polymeric resin (NDA) was prepared by introducing dimethylamine groups into hypercrosslinked copolymer of styrene and divinylbenzend (NDA150).The adsorption behaviors of o-hydroxybenzoic acid,p-hydroxybenzoic acid and 2,6-bihydroxycenzoic acid onto NDA150 and NDA were studied.The results show that the adsorption equilibrium data of o-hydroxybenzoic acid,p-hydroxybenzoic acid and 2,6-bihydroxycenzoic acid on NDA150 and NDA were well fitted by the Langmuir,Freundlich and Redlich-Peterson isotherms in the studied concentration ranges.The adsorption was exothermic and basically of physical character.NDA had higher adsorption affinity and capacity for the above hydroxybenzoic acids than those of NDA150,which was mainly due to the influence of amine group on NDA.