Yang Hao, Zhang Haoyuan, Kang Chengjun, Ji Chunqing, Shi Dongchen, Zhao Dan
Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Sci Adv. 2024 Dec 20;10(51):eads0260. doi: 10.1126/sciadv.ads0260. Epub 2024 Dec 18.
Membrane-based nanofiltration has the potential to revolutionize the large-scale treatment of organic solvents in various applications. However, the widely used commercial membranes suffer from low permeability, narrow structural tunability, and limited chemical resistance. Here, we report a strategy for fabricating covalent organic framework (COF) membranes with solvent-responsive structural flexibility. The interlayer shifting of these COF membranes in polar organic solvents results in sub-nanopores with high selectivity. High rejection rates (>99%), high permeance (>15 kilogram meter hour bar), and excellent organic solvent resistance of these smart COF membranes are achieved for a diverse array of nanofiltration applications.
基于膜的纳滤技术有潜力变革各种应用中有机溶剂的大规模处理。然而，广泛使用的商业膜存在渗透率低、结构可调性窄和耐化学性有限等问题。在此，我们报告了一种制备具有溶剂响应结构灵活性的共价有机框架（COF）膜的策略。这些COF膜在极性有机溶剂中的层间移动会产生具有高选择性的亚纳米孔。对于各种纳滤应用，这些智能COF膜实现了高截留率（>99%）、高渗透率（>15千克·米·小时·巴）和优异的有机溶剂耐受性。
