Large‐Area Ultrathin Metal–Organic Framework Membranes Fabricated on Flexible Polymer Supports for Gas Separations

材料科学 聚合物 金属有机骨架 金属 化学工程 纳米技术 气体分离 复合材料 化学 有机化学 工程类 冶金 吸附 生物化学
作者
Yueyao Liang,Zhengqing Zhang,Aibing Chen,Caijiao Yu,Yuxiu Sun,Juan Du,Zhihua Qiao,Zhi Wang,Michael D. Guiver,Chongli Zhong
出处
期刊:Angewandte Chemie [Wiley]
卷期号:63 (22) 被引量:18
标识
DOI:10.1002/anie.202404058
摘要

Abstract Ultrathin continuous metal–organic framework (MOF) membranes have the potential to achieve high gas permeance and selectivity simultaneously for otherwise difficult gas separations, but with few exceptions for zeolitic‐imidazolate frameworks (ZIF) membranes, current methods cannot conveniently realize practical large‐area fabrication. Here, we propose a ligand back diffusion‐assisted bipolymer‐directed metal ion distribution strategy for preparing large‐area ultrathin MOF membranes on flexible polymeric support layers. The bipolymer directs metal ions to form a cross‐linked two‐dimensional (2D) network with a uniform distribution of metal ions on support layers. Ligand back diffusion controls the feed of ligand molecules available for nuclei formation, resulting in the continuous growth of large‐area ultrathin MOF membranes. We report the practical fabrication of three representative defect‐free MOF membranes with areas larger than 2,400 cm 2 and ultrathin selective layers (50–130 nm), including ZIFs and carboxylate‐linker MOFs. Among these, the ZIF‐8 membrane displays high gas permeance of 3,979 GPU for C 3 H 6 , with good mixed gas selectivity (43.88 for C 3 H 6 /C 3 H 8 ). To illustrate its scale‐up practicality, MOF membranes were prepared and incorporated into spiral‐wound membrane modules with an active area of 4,800 cm 2 . The ZIF‐8 membrane module presents high gas permeance (3,930 GPU for C 3 H 6 ) with acceptable ideal gas selectivity (37.45 for C 3 H 6 /C 3 H 8 ).
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