Boric acid modified macroporous adsorption resin and its adsorption properties for catechol compounds
Boric acid modified macroporous adsorption resin and its adsorption properties for catechol compounds
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DOI：
10.1016/j.colsurfa.2020.124674
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发表时间：
2020-06-20
影响因子：
5.2
通讯作者：
Di, Duolong
中科院分区：
文献类型：
--
作者：
Liu, Baoqian;Liu, Jianfei;Di, Duolong
通过Friedal-Crafts烷基化反应，可以对树脂进行多种官能团的改性.本研究首次采用Friedal-Crafts酰化反应结合商品化的BNKX - 5合成了硼酸基大孔吸附树脂BNKX - 5 - BA。吸附实验结果表明，BNKX - 5和BNKX - 5 - BA的吸附量均受pH值的影响，BNKX - 5 - BA对所有目标化合物的吸附量均随pH值的升高而增大，而BNKX - 5的吸附量则相反。此外，聚合物对较大分子量的化合物具有较大的吸附容量。BNKX - 5 - BA对花旗松素的吸附等温线较好地符合Freundlich模型，吸附动力学过程符合准一级动力学方程。硼酸亲合力、氢键、π-π相互作用和分子筛效应可能是吸附的驱动力。该树脂可被pH < 4的50%乙醇溶液完全解吸，5次吸附-解吸循环后，吸附容量仅损失5.41%。本研究结果为硼酸修饰MARs分离纯化植物中儿茶酚类化合物提供了一种新的方法。
Resins have been modified with many functional groups by Friedal - Crafts alkylation reaction. In this research, a Friedal - Crafts acylation reaction in combination with commercial BNKX - 5 was first used to synthesize the boric acid - based macroporous resin named BNKX - 5 - BA. The adsorption results of the experiments showed that the adsorption capacities of BNKX - 5 and BNKX - 5 - BA were all affected by pH, and the adsorption capacities of all target compounds on BNKX - 5 - BA increased as the pH value increase, meanwhile opposite results observed for BNKX - 5. Furthermore, the polymers had larger adsorption capacity for larger molecular weight compounds. Adsorption isotherms of taxifolin on BNKX - 5 - BA were fitted better to Freundlich model and adsorption kinetic process followed the pseudo-first-order equation. The boric acid affinity, hydrogen bonding, pi-pi interactions and molecular sieving effect may have been the possible adsorption driving forces. The resin could be absolutely desorbed by 50 %, pH < 4 ethanol solution and after five adsorption - desorption cycles only 5.41 % loss in adsorption capacity. The results provide a method to modify MARs with boric acid to separate and purify catechol compounds from herbal plants.