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Research Progress in the Fabrication of covalent organic framework membranes for Chemical Separations

Chinese Journal of Polymer Science 2024年第2期42卷 141-158,I0005页

作者： Cui-Ting Ding Jin-Qiu Yuan Meng-Ying Xie Qing-Yuan Liu Zeng-Guang Yao Shi-Yu Zhang Run-Nan Zhang Hong Wu Zhong-Yi Jiang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Zhejiang Institute of Tianjin University NingboZhejiang315201China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin UniversityTianjin300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou350207China

Membrane technology has become one of the most promising separation technologies for its energy saving, high separation efficiency, environmental friendliness, and economic feasibility. covalent organic frameworks(COFs) with intrinsically high porosity, controllable pore size, uniform pore size distribution and long-range ordered channel structure, have emerged as next-generation materials to fabricate advanced separation membranes. This feature article summarizes some latest studies in the development of pure COF membranes in our lab, including their fabrication and applications in chemical separations. Finally, current challenges facing high-performance COF separation membranes are discussed.

关键词： covalent organic frameworks covalent organic framework membranes Water treatment organic solvent nanofiltration Gas separation

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Aqueous Two-Phase Interfacial Assembly of COF membranes for Water Desalination

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Nano-Micro Letters 2022年第12期14卷 491-504页

作者： 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 TechnologyTianjin UniversityTianjin 300072People’s Republic of China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192People’s Republic of China Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072People’s Republic of China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New CityFuzhou 350207People’s Republic of China

Aqueous two-phase system features with ultralow interfacial tension and thick interfacial region,affording unique confined space for membrane ***,for the first time,an aqueous two-phase interfacial assembly method is proposed to fabricate covalent organic framework(COF)*** aqueous solution containing polyethylene glycol and dextran undergoes segregated phase separation into two water-rich *** respectively distributing aldehyde and amine monomers into two aqueous phases,a series of COF membranes are fabricated at water-water *** 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 ***,the interfacial tension is found to have pronounced effect on membrane *** appropriate interfacial tension range(0.1-1.0 mN m^(−1))leads to the tight and intact COF ***,the method is extended to the fabrication of other COF and metal-organic polymer *** work is the first exploitation of fabricating membranes in all-aqueous system,confering a green and generic method for advanced membrane manufacturing.

关键词： covalent organic framework membranes Aqueous two-phase Interfacial polymerization Molecular separation Water desalination

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