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目的研究白花蛇舌草(HD)黄酮(HDF)在吸附性大孔树脂(HPD-826)上的静态吸附机制。方法在静态吸附条件下,筛选出适用于HDF提取的HPD-826,并研究其吸附热力学和动力学特征。结果 HDF在HPD-826大孔树脂上分离效果较好,且为放热过程,焓变为-17.6282kJ/mol;热力学特征符合Freundlich方程及Langmuir方程,准二级动力学方程可描述其动力学特征,表观吸附活化能为-29.3867kJ/mol;液膜扩散及颗粒内扩散是吸附速率的重要影响因素。结论 HPD-826大孔树脂适用于HDF的分离纯化。
Objective To study the static adsorption mechanism of HHD on the adsorptive macroporous resin (HPD-826). Methods HPD-826 suitable for HDF extraction was screened under static adsorption conditions and its adsorption thermodynamic and kinetic characteristics were studied. Results The separation of HDF on HPD-826 macroporous resin was better and its exothermic process was as high as -17.6282 kJ / mol. The thermodynamic characteristics were in accordance with the Freundlich equation and the Langmuir equation. The quasi-second-order kinetic equation could describe the kinetics The apparent activation energy of adsorption is -29.3867 kJ / mol. The diffusion of liquid film and intraparticle diffusion are the important influencing factors of the adsorption rate. Conclusion HPD-826 macroporous resin is suitable for the separation and purification of HDF.