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- Title
Balancing the Crystallinity and Film Formation of Metal–Organic Framework Membranes through In Situ Modulation for Efficient Gas Separation.
- Authors
Liu, Yutao; Chen, Hui; Li, Tong; Ren, Yongheng; Wang, Hui; Song, Zhengxuan; Li, Jianhui; Zhao, Qiang; Li, Jinping; Li, Libo
- Abstract
Polycrystalline metal–organic framework (MOF) layers hold great promise as molecular sieve membranes for efficient gas separation. Nevertheless, the high crystallinity tends to cause inter‐crystalline defects/cracks in the nearby crystals, which makes crystalline porous materials face a great challenge in the fabrication of defect‐free membranes. Herein, for the first time, we demonstrate the balance between crystallinity and film formation of MOF membrane through a facile in situ modulation strategy. Monocarboxylic acid was introduced as a modulator to regulate the crystallinity via competitive complexation and thus concomitantly control the film‐forming state during membrane growth. Through adjusting the ratio of modulator acid/linker acid, an appropriate balance between this structural "trade‐off" was achieved. The resulting MOF membrane with moderate crystallinity and coherent morphology exhibits molecular sieving for H2/CO2 separation with selectivity up to 82.5.
- Subjects
METAL-organic frameworks; CRYSTALLINITY; SEPARATION of gases; GAS separation membranes; MOLECULAR sieves; MONOCARBOXYLIC acids; CARBON dioxide adsorption
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 37, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202309095