离子交换纤维吸附儿茶素的热力学

Thermodynamic study of adsorption of catechin on ion exchange fiber

采用自制离子交换纤维对儿茶素的吸附特性进行了研究,在温度为286～328K和研究的浓度范围内,离子交换纤维对儿茶素吸附平衡数据符合Langmuir和Freundlich吸附等温方程.Freundlich吸附等温线和等量吸附焓表明:离子交换纤维对儿茶素吸附是吸热过程.对儿茶素在离子交换纤维上的吸附焓、自由能、吸附熵的计算表明,该离子交换纤维对儿茶素的吸附没有化学键生成,并对吸附行为作了合理解释.

The adsorption of catechin by using self-made ion exchange fiber （IEF） adsorbent was studied.Equilibrium data for the adsorption of catechin from aqueous solutions by IEF adsorbent within the temperature range of 286 328 K and observed concentration range were obtained and correlated with the Langmuir-type and Freundlich-type isotherm equations. Freundlich adsorption isotherms and isosteric enthalpy of the adsorption of catechin indicated that the process of adsorption of catechin from aqueous solutions by IEF was an endothermic process. Estimations of the isosteric enthalpy of adsorption, free energy, and entropy of adsorption were reported, and the adsorption behavior was reasonably interpreted.