β-环糊精微球吸附对苯二酚单甲基醚的动力学研究

Kinetics Study on Adsorption Behavior of β-Cyclodextrin Microsphere for Hydroquinone Monomethyl Ether

研究了以β-环糊精(β-CD)和环氧氯丙烷为原料,采用反相悬浮聚合法合成的β-CD微球对对苯二酚单甲基醚(HQMME)的静态吸附行为,分析了吸附热力学性质和动力学特征。实验结果表明:β-CD微球对HQMME的吸附过程同时符合Lagergren一级吸附动力学方程和McKay二级吸附动力学方程;β-CD微球对HQMME的吸附等温线可同时用Langmuir等温吸附方程和Freundlich等温吸附方程描述;在不同温度下,β-CD微球吸附HQMME的吸附焓变、吸附熵变、吸附吉布斯自由能变均为负值,说明吸附是一个自发、放热的过程。

Using β-Cyclodextrin（β-CD）as raw material,a kind of β-CD polymer microsphere was synthesized by inverse suspension polymerization method.The static adsorption process of β-CD polymer microsphere for hydroquinone monomethyl ether（HQMME）was studied and its thermodynamic and kinetic characteristics were analyzed.The experimental results show that：The adsorption accords with the first-order Lagergren adsorption kinetics equationas as well as the second-order McKay adsorption kinetics equation;The adsorption isotherm accords with the Langmuir and Freundlich adsorption isotherm equation;The enthalpy change ΔH,entropy change ΔS and Gibbs free energy change ΔG of the adsorption are all negative at different temperatures,which indicates that the adsorption of HQMME on the β-CD polymer microsphere is a spontaneous and exothermic process.