球状壳聚糖树脂对茶多酚的吸附热力学和动力学研究

Thermodynamics and Kinetics of Tea Polyphenols Adsorption onto Resins of Chitosan Microspheres

采用反相悬浮交联法制备了球状壳聚糖树脂(RCM),通过静态吸附实验,研究了RCM对茶多酚的吸附热力学和动力学特性。结果表明:吸附等温线符合Laugmiur等温曲线,且平衡常数Kb随着温度升高而升高。吸附是非自发的、吸热的、熵增加的过程。吸附过程符合二级动力学吸附模型,吸附过程主要受粒子内扩散模型控制。

Resins of chitosan microspheres （RCM） were prepared by using reverse phase suspension cross-linked polymerization. Static sorption experiments were carried out to study the adsorption kinetics and thermodynamics of tea polyphenols on RCM. The results indicated that the adsorption followed the Langmuir isotherm .The Langmuir equilibrium constant Kb increased with increasing temperature. The adsorption was a non-spontaneous endothermic process of increased entropy by studying thermodynamics of adsorption. The adsorption followed second-order kinetic equation. The adsorption rate of tea polyphenols on RCM was controlled by the intraparticle diffusion during the adsorption process.