Jia Mengmeng, Liang Yucang, Liu Ziyang, Liu Yue, Zhang Xuehong, Guo Hongxia
Faculty of Materials and Manufacturing, Beijing University of Technology Beijing 100124 P. R. China
Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
RSC Adv. 2022 Jun 7;12(26):16893-16902. doi: 10.1039/d2ra01491b. eCollection 2022 Jun 1.
Thanks to the characteristic hollow cavity structure and sustainable and nontoxic macrocycle molecule feature, cyclodextrins have been used as building block to fabricate organic solvent nanofiltration (OSN) membranes with enhanced permeability and selectivity. Herein, hydroxypropyl-β-cyclodextrin (HP-β-CD) was incorporated into a poly(ether--amide) (Pebax) layer on a polysulfone support, followed by crosslinking with toluene 2,4-diisocyanate to prepare a crosslinked HP-β-CD/Pebax (CHP) membrane. By adjusting the initial HP-β-CD concentration () and crosslinking reaction time (), the microporous structure and surface morphology of CHP ( = 0, 0.25, 0.5, 0.75; = 5, 10, 15) membranes could be manipulated. The OSN performances of the CHP membranes were evaluated by the removal of dyes in methanol solution. The results revealed that the optimal CHP membrane exhibited a high methanol permeance of 8.7 L m h bar, high dye rejection (>96%), and high running stability (at least 336 h), due to the intrinsically microporous structure and surface morphology. This work would inspire the further development of cyclodextrins and other macrocyclic molecules in the preparation of OSN membranes and provide a promising strategy to fabricate state-of-the-art membranes for the efficient separation of organic solvent reclamation and removal of organic pollutants.
由于具有独特的中空腔结构以及可持续且无毒的大环分子特性，环糊精已被用作构建模块来制备具有更高渗透性和选择性的有机溶剂纳滤（OSN）膜。在此，将羟丙基-β-环糊精（HP-β-CD）掺入聚砜支撑体上的聚（醚-酰胺）（Pebax）层中，随后与甲苯2,4-二异氰酸酯交联以制备交联的HP-β-CD/Pebax（CHP）膜。通过调节初始HP-β-CD浓度（）和交联反应时间（），可以控制CHP（= 0、0.25、0.5、0.75；= 5、10、15）膜的微孔结构和表面形态。通过在甲醇溶液中去除染料来评估CHP膜的OSN性能。结果表明，由于其固有的微孔结构和表面形态，最佳的CHP膜表现出8.7 L m h bar的高甲醇渗透率、高染料截留率（>96%）和高运行稳定性（至少336小时）。这项工作将激发环糊精和其他大环分子在OSN膜制备中的进一步发展，并为制备用于有机溶剂回收和有机污染物去除高效分离的先进膜提供一种有前景的策略。
