关键词: X-5大孔树脂, 黄芪异黄酮, 动力学, 热力学

Abstract: Through comparing adsorption and desorption characteristics of milk vetch root (Astragalus) isoflavones on five types of macroporous resin, it was found that X-5 macroporous resin was the most suitable one for the adsorption of isoflavones. Static adsorption experiments were carried out to investigate the adsorption kinetics and thermodynamics. Kinetics study indicated that the adsorption process could be best described by the pseudo-second-order model, and was controlled mainly by intra-particle diffusion. The isothermal adsorption followed the Langmuir model. The thermodynamic properties, i.e. ΔG0<0, ΔH0=8.021 kJ/mol and ΔS0=62.51J/(mol?K), revealed that the adsorption process was spontaneous, endothermic and feasible and the change in enthalpy was the main driving force for the adsorption of isoflavones on X-5 macroporous resin.

Key words: X-5 macroporous resin, isoflavones, kinetics, thermodynamics