Jin Yuan-Hang, Li Meng-Hao, Yang Ying-Wei
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China.
Adv Sci (Weinh). 2025 Feb;12(5):e2412600. doi: 10.1002/advs.202412600. Epub 2024 Dec 11.
Membranes with switchable wettability, solvent resistance, and toughness have emerged as promising materials for separation applications. However, challenges like limited mechanical strength, poor chemical stability, and structural defects during membrane fabrication hinder their widespread adoption. Covalent organic frameworks (COFs), crystalline materials constructed from organic molecules connected by covalent bonds, offer a promising solution due to their high porosity, stability, and customizable properties. The ordered structures and customizable functionality provide COFs with a lightweight framework, large surface area, and tunable pore sizes, which have attracted increasing attention for their applications in membrane separations. Recent research has extensively explored the preparation strategies of COF membranes and their applications in various separation processes. This review uniquely delves into the influence of various COF membrane fabrication techniques, including interfacial polymerization, layer-by-layer assembly, and in situ growth, on membrane thickness and performance. It comprehensively explores the design strategies and potential applications of these methods, with a particular focus on gas separation, oil/water separation, and organic solvent nanofiltration. Furthermore, future opportunities, challenges within this field, and potential directions for future development are proposed.
具有可切换润湿性、耐溶剂性和韧性的膜已成为分离应用中很有前景的材料。然而，诸如机械强度有限、化学稳定性差以及膜制备过程中的结构缺陷等挑战阻碍了它们的广泛应用。共价有机框架（COF）是由通过共价键连接的有机分子构成的晶体材料，由于其高孔隙率、稳定性和可定制的特性，提供了一种很有前景的解决方案。有序的结构和可定制的功能为COF提供了轻质框架、大表面积和可调孔径，这使其在膜分离应用中越来越受到关注。最近的研究广泛探索了COF膜的制备策略及其在各种分离过程中的应用。本综述独特地深入探讨了包括界面聚合、层层组装和原位生长在内的各种COF膜制备技术对膜厚度和性能的影响。它全面探索了这些方法的设计策略和潜在应用，特别关注气体分离、油/水分离和有机溶剂纳滤。此外，还提出了该领域未来的机遇、挑战以及未来发展的潜在方向。
