Issue 11, 2023

Two-step fabrication of COF membranes for efficient carbon capture

Abstract

Covalent organic framework (COF) materials have been considered as disruptive membrane materials for gas separation. The dominant one-step method for COF nanosheet synthesis often suffers from coupling among polymerization, assembly and crystallization processes. Herein, we propose a two-step method comprising a framework assembly step and functional group switching step to synthesize COF nanosheets and the corresponding COF membranes. In the first step, the pristine COF-316 nanosheets bearing cyano groups are prepared via interfacial polymerization. In the second step, the cyano groups in COF-316 nanosheets were switched into amidoxime groups or carboxyl groups. Through the vacuum-assisted self-assembly method, the COF nanosheets were fabricated into membranes with a thickness below 100 nm. Featuring numerous mass transport channels and homogeneous distribution of functional groups, the amidoxime-modified COF-316 membrane demonstrated excellent separation performance, with a permeance above 500 GPU and a CO2/N2 selectivity above 50. The two-step method may inspire the rational design and fabrication of organic framework membranes.

Graphical abstract: Two-step fabrication of COF membranes for efficient carbon capture

Supplementary files

Article information

Article type
Communication
Submitted
28 jun 2023
Accepted
11 aug 2023
First published
11 aug 2023

Mater. Horiz., 2023,10, 5016-5021

Two-step fabrication of COF membranes for efficient carbon capture

Y. Wang, J. Zhao, S. Zhang, Z. Zhang, Z. Zhu, M. Wang, B. Lyu, G. He, F. Pan and Z. Jiang, Mater. Horiz., 2023, 10, 5016 DOI: 10.1039/D3MH00981E

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