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目的:优选栀子苷的大孔树脂吸附条件,考察栀子苷在SP825型大孔树脂的吸附动力学、热力学过程。方法:在单因素试验基础上,以栀子苷吸附率为指标,采用响应面法优化栀子苷的吸附条件,确定SP825型树脂吸附栀子苷的等温吸附模型、动力学模型和热力学参数。结果:最佳吸附条件为上样液质量浓度83 g·L-1,pH 2.79;最大吸附量247 mg·g-1。Freundlich方程可很好地拟合等温吸附热力学过程,拟二级方程可很好地描述吸附动力学过程。结论:栀子苷的吸附过程为自发放热反应,且低温有利于吸附,吸附速率主要由液膜扩散控制。
Objective: To optimize the adsorption conditions of macroporous resin for geniposide, and to study the adsorption kinetics and thermodynamic process of geniposide in SP825 macroporous resin. Methods: Based on the single factor test, the adsorption rate of geniposide was used as an index, and the adsorption conditions of geniposide were optimized by response surface methodology. The isothermal adsorption model, kinetic model and thermodynamic parameters of geniposide adsorbed by SP825 resin were determined. Results: The optimal adsorption conditions were as follows: the concentration of sample solution was 83 g · L-1, pH was 2.79; the maximum adsorption capacity was 247 mg · g-1. The Freundlich equation can well fit the isothermal adsorption thermodynamic process, and the pseudo-second-order equation can well describe the adsorption kinetic process. Conclusion: The adsorption of geniposide is a spontaneous exothermic reaction, and low temperature is good for adsorption. The adsorption rate is controlled mainly by liquid film diffusion.