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

摘要:

通过对NDA150聚苯乙烯树脂的氨基化修饰,制备了一种新型的亲水性NDA99树脂.研究了NDA150和NDA99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NDA150和NDA99树脂上的吸附符合Langmuir,Frundlich和RP吸附等温方程,吸附为放热的物理吸附过程.受NDA99树脂上的胺基的影响,NDA99树脂对上述几种羟基苯甲酸的吸附亲和力和吸附能力较NDA150有明显提高.

关键词:树脂; 吸附; 羟基苯甲酸; 吸附焓

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.

Key words:resin; adsorption; hydroxybenzoic acid; adsorption enthalpy