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Issue 35, 2018
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An azine-linked covalent organic framework ACOF-1 membrane for highly selective CO2/CH4 separation

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Abstract

Covalent organic frameworks (COFs) are promising for constructing gas-separation membranes due to their versatile architectures, customizable functionalities and chemical stabilities. However, synthesis of continuous COF membranes still remains a challenge and rather underexplored. Herein, we present a two-dimensional (2D) azine-linked ACOF-1 membrane synthesized on a porous support by a solvothermal approach. The ACOF-1 membrane with a thickness of 8 μm shows a high selectivity of 86.3 in CO2/CH4 mixed gas separation with a favorable CO2 permeance of about 9.9 × 10−9 mol m−2 s−1 Pa−1, and the overall performance exceeds the Robeson upper bound (2008). This surprising molecular sieving effect is attributed to an effective narrowing of the pore diameter (0.94 nm) owing to crystal intergrowth. A long-term test of gas permeation demonstrates the outstanding stability of the ACOF-1 membrane. These properties recommend the ACOF-1 membrane for CO2 capture and other gas separations.

Graphical abstract: An azine-linked covalent organic framework ACOF-1 membrane for highly selective CO2/CH4 separation

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Supplementary files

Article information


Submitted
13 Jun 2018
Accepted
17 Aug 2018
First published
21 Aug 2018

J. Mater. Chem. A, 2018,6, 16849-16853
Article type
Communication

An azine-linked covalent organic framework ACOF-1 membrane for highly selective CO2/CH4 separation

H. Fan, A. Mundstock, J. Gu, H. Meng and J. Caro, J. Mater. Chem. A, 2018, 6, 16849
DOI: 10.1039/C8TA05641B

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