Laminated self-standing covalent organic framework membrane with uniformly distributed subnanopores for ionic and molecular sieving

Yang Li, Qianxun Wu, Xinghua Guo, Meicheng Zhang, Bin Chen, Guanyi Wei, Xing Li, Xiaofeng Li, Shoujian Li () and Lijian Ma ()
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Yang Li: Sichuan University
Qianxun Wu: Sichuan University
Xinghua Guo: Sichuan University
Meicheng Zhang: Sichuan University
Bin Chen: Northwest Institute of Nuclear Technology
Guanyi Wei: Northwest Institute of Nuclear Technology
Xing Li: Sichuan University
Xiaofeng Li: Sichuan University
Shoujian Li: Sichuan University
Lijian Ma: Sichuan University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract The preparation of subnanoporous covalent-organic-framework (COF) membranes with high performance for ion/molecule sieving still remains a great challenge. In addition to the difficulties in fabricating large-area COF membranes, the main reason is that the pore size of 2D COFs is much larger than that of most gas molecules and/or ions. It is urgently required to further narrow their pore sizes to meet different separation demands. Herein, we report a simple and scalable way to grow large-area, pliable, free-standing COF membranes via a one-step route at organic–organic interface. The pore sizes of the membranes can be adjusted from >1 nm to sub-nm scale by changing the stacking mode of COF layers from AA to AB stacking. The obtained AB stacking COF membrane composed of highly-ordered nanoflakes is demonstrated to have narrow aperture (∼0.6 nm), uniform pore distribution and shows good potential in organic solvent nanofiltration, water treatment and gas separation.

Date: 2020
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DOI: 10.1038/s41467-019-14056-7

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