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选取19种具有不同骨架和功能基的大孔吸附树脂，对光甘草定的吸附性能进行了评价。从中选出4种吸附率和解吸附率均较高的大孔吸附树脂，其中HPD750对光甘草定的吸附容量最高。分别考察了光甘草定在4种大孔吸附树脂上的动力学行为。系统研究了光甘草定在HPD750上的吸附等温行为和吸附热力学行为。吸附等温过程的研究表明，光甘草定在HPD750上的等温吸附过程可以利用Freundlich等温吸附模型进行很好地拟合。热力学参数(ΔG、ΔH和ΔS)表明，光甘草定在HPD750上的吸附是自发、放热、熵减的过程。在此基础上，利用不同的数学模型对光甘草定在大孔吸附树脂上的吸附机理进行了探讨。结果表明，光甘草定在HPD750、LX-68、D101和LSA-30 4种大孔吸附树脂上的吸附行为，可以很好地利用准二级动力学模型和Elovich模型进行拟合，其吸附过程均受到膜扩散和颗粒内扩散的共同控制。其中光甘草定在HPD750上的吸附行为可以很好地利用微孔扩散模型进行拟合。本研究结果可为从光果甘草中分离制备光甘草定提供理论指导和技术支持。
Abstract：A method for enrichment and purification of glabridin from Glycyrrhiza glabra L.(G. glabra L.) was established by adsorption and desorption procedure of macroporous adsorption resins(MARs). Nineteen kinds of widely used MARs with different polymeric backbones and functional groups were evaluated in the present study regarding their glabridin adsorption performance and four of them were selected as the optimal MARs. The adsorption dynamic behaviors of glabridin on the optimal MARs were investigated in detail by means of diverse mathematical models. The Pseudo-second-order adsorption rate equation fitted well all the kinetic data for the optimal MARs. The intra-particle diffusion model indicated that film diffusion as well as the intra-particle diffusion influenced the adsorption. The micropore diffusion model could well describe the kinetic process on HPD750. The Elovich equation provided a good correlation for the adsorption of glabridin onto the optimal MARs. The results also showed that among the four optimal MARs, HPD750 had the better adsorption and desorption behaviors for glabridin than other MARs. Therefore, HPD750 was identified as the most promising adsorbent for glabridin separation and purification. Adsorption isotherm and thermodynamics were studied on HPD750. Experimental results showed that equilibrium isotherms could be better fitted by Freundlich model than Langmuir model. The thermodynamic parameters(ΔH, ΔS and ΔG) showed that the adsorption of glabridin was feasible, exothermic,and spontaneous at 298K to 318K. The study might provide scientific references for the largescale production of glabridin from G. glabra L. extracts.
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基本信息:
DOI：10.16026/j.cnki.iea.2022020106
中图分类号:O647.3;TQ658
引用信息:
[1]李晓婷,邸多隆.大孔吸附树脂对光甘草定吸附行为的研究[J].离子交换与吸附,2022,38(02):106-117.DOI:10.16026/j.cnki.iea.2022020106.
基金信息:
国家高技术研究发展计划(863计划,2014AA022203); 国家自然科学基金面上项目(21374138); 甘肃省教育厅2021年度产业支撑计划项目(2021CYZC-66)