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Growing ZIF-8 Seeds on Charged COF Substrates toward Efficient Propylene-Propane Separation Membranes |
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| Authors: | Yunchuan Pu Mingang Zhao Xu Liang Shaoyu Wang Dr Hongjian Wang Ziting Zhu Dr Yanxiong Ren Zhiming Zhang Prof Guangwei He Prof Dan Zhao Prof Zhongyi Jiang |
| Institution: | 1. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai New City, Fuzhou, 350207 China
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585 Singapore;2. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China;3. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai New City, Fuzhou, 350207 China Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China;4. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China;5. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585 Singapore;6. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai New City, Fuzhou, 350207 China |
| Abstract: | We report a covalent organic framework (COF) induced seeding strategy to fabricate metal–organic framework (MOF) membranes. Contrary to graphene oxide nuclei-depositing substrate, COF substrate has uniform pore size, high microporosity and abundant functional groups. We designed a series of charged COF nanosheets to induce the formation of ZIF-8@COF nanosheet seeds with high aspect ratio over 150, which were readily processed into a compact and uniform seed layer. The resulting ZIF-8 membranes with thickness down to 100 nm exhibit an ultrahigh C3H6/C3H8 separation performance and superior long-term stability. Our strategy is also validated by fabricating ultrathin ZIF-67 and UiO-66 membranes. |
| Keywords: | Covalent Organic Frameworks Heterogeneous Nucleation Membranes Metal–Organic Frameworks Olefin/Paraffin Separation |