硫辛酸在三种不同树脂上的吸附热力学和动力学研究

Studies of the Adsorption Thermodynamics and Kinetics of Lipoic Acid on Three Types of Resin

通过静态吸附实验,研究了大孔交联聚苯乙烯树脂(XAD-4)、氧修饰超高交联聚苯乙烯树脂（NDA-100）和胺基修饰超高交联聚苯乙烯树脂（ND-90）对乙醇-水溶液中硫辛酸的吸附热力学及动力学特性，结果表明：硫辛酸在XAD-4树脂上是单层吸附，符合Langmuir 等温吸附方程，吸附过程符合准一级动力学吸附方程。硫辛酸在NDA-100和ND-90树脂上的吸附也符合Langmuir等温吸附方程，但并不只是单层吸附，同时兼有毛细管凝聚和微孔填充作用，吸附过程可分为大孔和中孔区的吸附以及微孔区的吸附两个阶段，两个阶段都符合准一级动力学吸附方程。

Studies of the adsorption thermodynamics and kinetics of lipoic acid by XAD-4,NDA-100 and ND-90 resin was car-ried out through static experiments.The results show that the adsorption layer of lipoic acid on XAD-4 resin is Langmuir monolay-er,and the adsorption rate appears to be the first order kinetics.The adsorption of lipoic acid on NDA-100 and ND-90 resin also olayer adsorption.The adsorption of lipoic scid on NDA-100 and ND-90 resin pass through two stages:macropores and mespores area and micropores area.And the adsorption rates of the two phases are the first order kinetics.