Microporous polymer adsorptive membranes with high processing capacity for molecular separation

Zhenggong Wang, Xiaofan Luo, Zejun Song, Kuan Lu, Shouwen Zhu, Yanshao Yang, Yatao Zhang, Wangxi Fang () and Jian Jin ()
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Zhenggong Wang: Soochow University
Xiaofan Luo: Chinese Academy of Sciences
Zejun Song: Chinese Academy of Sciences
Kuan Lu: Chinese Academy of Sciences
Shouwen Zhu: Soochow University
Yanshao Yang: Chinese Academy of Sciences
Yatao Zhang: Zhengzhou University
Wangxi Fang: Chinese Academy of Sciences
Jian Jin: Soochow University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Trade-off between permeability and nanometer-level selectivity is an inherent shortcoming of membrane-based separation of molecules, while most highly porous materials with high adsorption capacity lack solution processability and stability for achieving adsorption-based molecule separation. We hereby report a hydrophilic amidoxime modified polymer of intrinsic microporosity (AOPIM-1) as a membrane adsorption material to selectively adsorb and separate small organic molecules from water with ultrahigh processing capacity. The membrane adsorption capacity for Rhodamine B reaches 26.114 g m−2, 10–1000 times higher than previously reported adsorptive membranes. Meanwhile, the membrane achieves >99.9% removal of various nano-sized organic molecules with water flux 2 orders of magnitude higher than typical pressure-driven membranes of similar rejections. This work confirms the feasibility of microporous polymers for membrane adsorption with high capacity, and provides the possibility of adsorptive membranes for molecular separation.

Date: 2022
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DOI: 10.1038/s41467-022-31575-y

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