The effect of different solvents on the formation of large‐area MOF membranes

作者：Fan Zhou, Yanling Chen, Zhengqing Zhang, Zhenjie Gu, Yuxiu Sun, Minman Tong, Qingyuan Yang, Wenjun Dong, Yichang Pan, Zhihua Qiao, Chongli Zhong · 发表于：AIChE Journal · 年份：2024 · DOI：10.1002/aic.18455 · 被引用次数：24 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Advanced Battery Technologies Research、Ionic liquids properties and applications

Abstract Metal–organic framework (MOF) membranes are widely used in gas separation processes. However, the effect of solvents on the formation of large‐area MOF membranes, which directly influences separation performance, has rarely been investigated. In this study, three solvents (methanol, ethanol, and water) were selected to systematically investigate their effects on the zeolite imidazolium frameworks (ZIF) membrane formation via experimental validation and simulations. The results indicated that the solvent selection influenced crystallization rate, crystal size, and ZIF‐8 membrane formation ability. Particularly, when water was used as a solvent, slow nucleation and crystallization of the ZIF‐8 crystals were observed, resulting in a more complete crystal structure and a thinner ZIF‐8 membrane. Therefore, the ZIF‐8 membrane exhibited a gas permeance of 10,000 gas permeation unit and enhanced CO 2 /N 2 selectivity. Furthermore, ZIF‐8 membrane with a surface area of 2400 cm 2 and spiral‐wound membrane modules were developed, paving the way for large‐scale industrial production.