Abstract: The process of static adsorption,desorption,dynamic adsorption and adsorption kinetics of baicalin on macroporous adsorption resin immobilized tannins by Mannich reaction were investigated.The results showed the optimal conditions of the static adsorption are: the concentration of baicalin is 45 mg/L,the mass of resin is 0.2 g,pH value is controlled between 5.5-5.99,the temperature of adsorption is 35℃,the adsorption time is 24 h; isothermal adsorption fitted to Freundlich isothermal equation;the optimal conditions of the static desorption are: the concentration of ethanol is 70 %,the temperature of desorption is 35℃,the desorption time is 3 h; particle dispersion was the major controlling step of adsorption rate which can be described by G E Boyd equation.The absorption capacity of immobilized tannins macroporous adsorption resins is 25 mg/g.

Key words: immobilized tannins macroporous adsorption resins, baicalin, adsorption mechanism