Aqueous two-phase system features with ultralow interfa-cial tension and thick interfacial region,affording unique confined space for membrane assembly.Here,for the first time,an aqueous two-phase interfacial assembly method is proposed to fabricate covalent organic framework(COF)membranes.The aqueous solution containing poly-ethylene glycol and dextran undergoes segregated phase separation into two water-rich phases.By respectively distributing aldehyde and amine monomers into two aqueous phases,a series of COF membranes are fabricated at water-water interface.The resultant membranes exhibit high NaCl rejection of 93.0-93.6％and water permeance reaching 1.7-3.7 L m-2 h-1 bar-1,superior to most water desalination membranes.Interestingly,the interfacial tension is found to have pronounced effect on membrane structures.The appropriate interfacial tension range(0.1-1.0 mN m-1)leads to the tight and intact COF membranes.Furthermore,the method is extended to the fabrication of other COF and metal-organic polymer membranes.This work is the first exploitation of fabricating membranes in all-aqueous system,confering a green and generic method for advanced membrane manufacturing.

Hongjian Wang;Jiashuai Zhao;Yang Li;Yu Cao;Ziting Zhu;Meidi Wang;Runnan Zhang;Fusheng Pan;Zhongyi Jiang

Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,People's Republic of China;Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,People's Republic of China;Department of Chemistry,Tianjin Key Laboratory of Molecular Optoelectronic Science,Tianjin University,Tianjin 300072,People's Republic of China;Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University Binhai New City,Fuzhou 350207,People's Republic of China

纳微快报（英文）

[1]Hongjian Wang;Jiashuai Zhao;Yang Li;Yu Cao;Ziting Zhu;Meidi Wang;Runnan Zhang;Fusheng Pan;Zhongyi Jiang-.Aqueous Two-Phase Interfacial Assembly of COF Membranes for Water Desalination)[J].纳微快报（英文）,2022(12):491-504

confering

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