固化单宁大孔吸附树脂对黄芩苷吸附性能的研究

Study on Adsorption of Baicalin on Immobilized Tannins Macroporous Adsorption Resin

研究了通过曼尼西反应合成的单宁大孔吸附树脂对黄芩苷的静态吸附、脱附、动态吸附、吸附动力学过程。结果表明，最佳静态吸附条件为：黄芩苷初始浓度固定在45mg／L，树脂投加量为0．2g，溶液pH值控制在5．5—5．99，即控制在弱酸性条件下，吸附温度控制在35℃，静态吸附24h；等温吸附可用Freundlich等温方程描述；最佳静态脱附条件为：以体积分数为70％乙醇水溶液作为脱附剂，脱附温度控制在45℃，静态脱附3h；颗粒内扩散是吸附的主控步骤，可用GEBovd扩散方程臬描述。该单宁大孔吸附树脂对黄芩苷的吸附容量达25mg／g。

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.