Vacuum-Assisted Confined Growth of MOF@COF Composite Membranes with Enhanced Hydrogen Permselectivity

authored by: Siqi Li, Zheng Wan, Chunxin Jin, Jinlin Hao, Yanhong Li, Xiaofang Chen, Jürgen Caro, Aisheng Huang
Abstract: With ordered and periodic network structures, adjustable pore sizes and high chemical stability, covalent organic frameworks (COFs) have drawn much attention for the fabrication of superior separation membranes. However, it is challenging to prepare COF membranes with a molecular sieving property for gas separation due to their relatively large pore size. In this work, we develop the MOF-in-COF concept for vacuum-assisted synthesis of metal–organic framework (MOF) ZIF-8 inside the pores of TB-COF formed from trihydroxy-benzene-tricarbaldehyde (T) and diamino-biphenyl-disulfonic acid (B), thus constructing a novel ZIF-8@TB-COF membrane. Attributing to the formation of a well-defined one-dimensional (1D) nanoscale transport channel, the ZIF-8@TB-COF membrane displays a high hydrogen permselectivity. At 100 °C and 200 kPa, the mixture separation factors of H₂/CO₂, H₂/CH₄ and H₂/C₃H₈ are 21.9, 63.1 and 134.4, respectively, which are much higher than those of the pristine TB-COF membrane due to the precise size sieving channels brought about by the incorporated MOF. The synthesis of ZIF-67@TB-COF membrane demonstrates the versatility of the synthesis strategy.
Organisation(s): Institute of Physical Chemistry and Electrochemistry
External Organisation(s): East China Normal University
Institute of Eco-Chongming
Type: Article
Journal: Angewandte Chemie - International Edition
Volume: 64
No. of pages: 9
ISSN: 1433-7851
Publication date: 10.02.2025
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Catalysis, General Chemistry
Electronic version(s): https://doi.org/10.1002/anie.202419946 (Access: Closed)

BibTeX

@article{f2e5af3772964a49a5fa77b04de3dd4a,
title = "Vacuum-Assisted Confined Growth of MOF@COF Composite Membranes with Enhanced Hydrogen Permselectivity",
abstract = "With ordered and periodic network structures, adjustable pore sizes and high chemical stability, covalent organic frameworks (COFs) have drawn much attention for the fabrication of superior separation membranes. However, it is challenging to prepare COF membranes with a molecular sieving property for gas separation due to their relatively large pore size. In this work, we develop the MOF-in-COF concept for vacuum-assisted synthesis of metal–organic framework (MOF) ZIF-8 inside the pores of TB-COF formed from trihydroxy-benzene-tricarbaldehyde (T) and diamino-biphenyl-disulfonic acid (B), thus constructing a novel ZIF-8@TB-COF membrane. Attributing to the formation of a well-defined one-dimensional (1D) nanoscale transport channel, the ZIF-8@TB-COF membrane displays a high hydrogen permselectivity. At 100 °C and 200 kPa, the mixture separation factors of H2/CO2, H2/CH4 and H2/C3H8 are 21.9, 63.1 and 134.4, respectively, which are much higher than those of the pristine TB-COF membrane due to the precise size sieving channels brought about by the incorporated MOF. The synthesis of ZIF-67@TB-COF membrane demonstrates the versatility of the synthesis strategy.",
keywords = "Confined growth, Covalent organic framework membranes, Metal–organic framework membranes, MOF@COF composite, Molecular sieve membranes",
author = "Siqi Li and Zheng Wan and Chunxin Jin and Jinlin Hao and Yanhong Li and Xiaofang Chen and J{\"u}rgen Caro and Aisheng Huang",
note = "Publisher Copyright: {\textcopyright} 2024 Wiley-VCH GmbH.",
year = "2025",
month = feb,
day = "10",
doi = "10.1002/anie.202419946",
language = "English",
volume = "64",
journal = "Angewandte Chemie - International Edition",
issn = "1433-7851",
publisher = "John Wiley and Sons Ltd",
number = "7",
}