Balancing the Crystallinity and Film Formation of Metal–Organic Framework Membranes through In Situ Modulation for Efficient Gas Separation

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 challe...

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Published inAngewandte Chemie International Edition Vol. 62; no. 37; pp. e202309095 - n/a
Main Authors Liu, Yutao, Chen, Hui, Li, Tong, Ren, Yongheng, Wang, Hui, Song, Zhengxuan, Li, Jianhui, Zhao, Qiang, Li, Jinping, Li, Libo
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 11.09.2023
EditionInternational ed. in English
Subjects
Carbon dioxide
Crystal defects
Crystallinity
Crystals
Fabrication
Film Formation
Gas Separation
In Situ Modulation
Membranes
Metal-organic frameworks
Modulation
MOF Membrane
Molecular sieves
Porous materials
MOF Membrane
Film Formation
Crystallinity
In Situ Modulation
Gas Separation
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Summary: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. The balance between crystallinity and film‐formation of metal–organic framework (MOF) membrane is demonstrated for the first time using a facile in situ modulation strategy. Through competitive complexation with a ligand, acetic acid systematically reduces the crystallinity and optimizes the film formation of the MOF membrane, influencing its gas separation properties.
Bibliography:These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202309095