Photo-tailored heterocrystalline covalent organic framework membranes for organics separation

Jinqiu Yuan, Xinda You, Niaz Ali Khan, Runlai Li, Runnan Zhang, Jianliang Shen, Li Cao, Mengying Long, Yanan Liu, Zijian Xu, Hong Wu () and Zhongyi Jiang ()
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Jinqiu Yuan: Tianjin University
Xinda You: Tianjin University
Niaz Ali Khan: Tianjin University
Runlai Li: National University of Singapore
Runnan Zhang: Tianjin University
Jianliang Shen: Tianjin University
Li Cao: Tianjin University
Mengying Long: Tianjin University
Yanan Liu: Tianjin University
Zijian Xu: Tianjin University
Hong Wu: Tianjin University
Zhongyi Jiang: Tianjin University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Organics separation for purifying and recycling environment-detrimental solvents is essential to sustainable chemical industries. Covalent organic framework (COF) membranes hold great promise in affording precise and fast organics separation. Nonetheless, how to well coordinate facile processing—high crystalline structure—high separation performance remains a critical issue and a grand challenge. Herein, we propose a concept of heterocrystalline membrane which comprises high-crystalline regions and low-crystalline regions. The heterocrystalline COF membranes are fabricated by a two-step procedure, i.e., dark reaction for the construction of high-crystalline regions followed by photo reaction for the construction of low-crystalline regions, thus linking the high-crystalline regions tightly and flexibly, blocking the defect in high-crystalline regions. Accordingly, the COF membrane exhibits sharp molecular sieving properties with high organic solvent permeance up to 44-times higher than the state-of-the-art membranes.

Date: 2022
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DOI: 10.1038/s41467-022-31361-w

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