Fabrication of Highly Oriented Ultrathin Zirconium Metal-Organic Framework Membrane from Nanosheets towards Unprecedented Gas Separation |
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| Authors: | Dr. Yanwei Sun Jiahui Yan Yunlei Gao Taotao Ji Sixing Chen Chen Wang Prof. Dr. Peng Lu Prof. Dr. Yanshuo Li Prof. Dr. Yi Liu |
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| Affiliation: | 1. State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, 116024 Dalian, China;2. School of Materials Science and Chemical Engineering, Ningbo University, 315211 Ningbo, China |
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| Abstract: | Concurrent regulation of crystallographic orientation and thickness of zirconium metal–organic framework (Zr-MOF) membranes is challenging but promising for their performance enhancement. In this study, we pioneered the fabrication of uniform triangular-shaped, 40 nm thick UiO-66 nanosheet (NS) seeds by employing an anisotropic etching strategy. Through innovating confined counter-diffusion-assisted epitaxial growth, highly (111)-oriented 165 nm-thick UiO-66 membrane was prepared. The significant reduction in thickness and diffusion barrier in the framework endowed the membrane with unprecedented CO2 permeance (2070 GPU) as well as high CO2/N2 selectivity (35.4), which surpassed the performance limits of state-of-the-art polycrystalline MOF membranes. In addition, highly (111)-oriented 180 nm-thick NH2-UiO-66 membrane showing superb H2/CO2 separation performance with H2 permeance of 1230 GPU and H2/CO2 selectivity of 41.3, was prepared with the above synthetic procedure. |
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| Keywords: | Gas Separation MOF Membrane Nanosheets Orientation |
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