Luo Yingjie, Huang Xiaoxia, Yao Shun, Peng Lincai, Li Fulin, Song Hang
Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610000, China.
Polymers (Basel). 2020 Sep 23;12(10):2171. doi: 10.3390/polym12102171.
A series of imidazolium ionic liquid monomers with L-Proline anions (ViImCn-L-Pro and (ViIm)2Cn(L-Pro)2) were firstly synthesized, after which new copolymer materials were prepared by polymerization of the ionic liquid monomers with N,N'-methylene diacrylamide (MBA). Polymerization conditions, including the ratio of Ils(ViImC-L-Pro or (ViIm)C(L-Pro)) and MBA, solvent, ionic liquids and initiator's amount, were investigated and found to have an important effect on the adsorption capacity. Polymerization conditions were shown to have more significant impacts on adsorption capacities in the following order: the ratio of Ils and MBA > the amount of initiator > ionic liquids > solvent. The polymers were characterized by IR, EA, SEM, particle size distribution and TG. One of the polymers exhibited the highest selective adsorption capacity of tea polyphenols (521 mg/g). which was significantly higher than other adsorption media. The absorbed tea polyphenols could be desorbed readily with 2% hydrochloric acid methanol solution as eluent. The polymer material could maintain a higher adsorption capacity after four reuses. Based on this polymer, a new method for the efficient separation of tea polyphenols from tea water could be developed.
首先合成了一系列带有L-脯氨酸阴离子的咪唑鎓离子液体单体（ViImCn-L-Pro和(ViIm)2Cn(L-Pro)2），之后通过离子液体单体与N,N'-亚甲基双丙烯酰胺（MBA）聚合制备了新型共聚物材料。研究了聚合条件，包括离子液体（ViImC-L-Pro或(ViIm)C(L-Pro)）与MBA的比例、溶剂、离子液体和引发剂的用量，发现这些条件对吸附容量有重要影响。结果表明，聚合条件对吸附容量的影响程度依次为：离子液体与MBA的比例＞引发剂用量＞离子液体＞溶剂。通过红外光谱（IR）、元素分析（EA）、扫描电子显微镜（SEM）、粒度分布和热重分析（TG）对聚合物进行了表征。其中一种聚合物对茶多酚表现出最高的选择性吸附容量（521 mg/g），显著高于其他吸附介质。用2%盐酸甲醇溶液作为洗脱剂，被吸附的茶多酚能够很容易地解吸出来。该聚合物材料在重复使用四次后仍能保持较高的吸附容量。基于这种聚合物，可以开发一种从茶水中高效分离茶多酚的新方法。
