氨基聚苯乙烯树脂对羟基苯甲酸的吸附行为

Adsorption Properties of Hydroxybenzoic Acids on Amine Modified Polystyrene Resin

通过对NDA-150聚苯乙烯树脂的氨基化修饰,制备了一种新型的亲水性NDA-99树脂.研究了NDA-150和NDA-99树脂对邻羟基苯甲酸、对羟基苯甲酸和2,6-二羟基苯甲酸的吸附行为.结果表明,在研究的浓度范围内,几种羟基苯甲酸在NDA-150和NDA-99树脂上的吸附符合Langmuir,Frundlich和R-P吸附等温方程,吸附为放热的物理吸附过程.受NDA-99树脂上的胺基的影响,NDA-99树脂对上述几种羟基苯甲酸的吸附亲和力和吸附能力较NDA-150有明显提高.

A new amine-modified hypercrosslinked polymeric resin（NDA-） was prepared by introducing dimethylamine groups into hypercrosslinked copolymer of styrene and divinylbenzend（NDA-150）.The adsorption behaviors of o-hydroxybenzoic acid,p-hydroxybenzoic acid and 2,6-bihydroxycenzoic acid onto NDA-150 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 NDA-150 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 NDA-150,which was mainly due to the influence of amine group on NDA-.