Issue 23, 2021

A binary all-nanoporous composite membrane constructed via vapor phase transformation for high-permeance gas separation

Abstract

Metal–organic framework (MOF) membranes with an ultra-small pore size (<4 Å) have shown great prospects in the highly selective separation of small gas molecules such as hydrogen, but their narrow channels may result in a low gas permeance. To improve the gas permeance of ultra-microporous MOF membranes, a stable covalent organic framework (COF) with large and uniform pores is doped to construct a binary COF/MOF all-nanoporous composite (ANC) membrane, equivalent to reducing the effective membrane thickness but avoiding the challenging ultra-thin membrane preparation. The COF synthesized by ball milling is combined with a metal gel to form a precursor membrane, which was then transformed to a COF/MOF ANC membrane by treatment with the MOF ligand vapor. A very small amount of solvent has been applied, offering an environmentally-friendly preparation process. Compared with the pristine MOF membrane, the COF/MOF ANC membranes possess a highly improved gas permeance from 22 GPU to 551 GPU with a slight sacrifice of selectivity; this introduces a new strategy to optimize the separation performance of MOF membranes.

Graphical abstract: A binary all-nanoporous composite membrane constructed via vapor phase transformation for high-permeance gas separation

Supplementary files

Article information

Article type
Research Article
Submitted
08 jul 2021
Accepted
27 sep 2021
First published
01 okt 2021

Inorg. Chem. Front., 2021,8, 5016-5023

A binary all-nanoporous composite membrane constructed via vapor phase transformation for high-permeance gas separation

M. Bu, Y. Feng, Q. Li, Y. Wang, S. Feng, K. Zhang, Y. Jiang, L. Fan, Z. Kang and D. Sun, Inorg. Chem. Front., 2021, 8, 5016 DOI: 10.1039/D1QI00847A

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