Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 1, Pages 327-331Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811638
Keywords
fast current-driven synthesis; gas separation; mixed-linker; MOF membrane; zeolitic imidazolate framework
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Funding
- Natural Science Foundation of China [21536005, 21606086]
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ZIF-8 membrane has the potential for CO2/CH4 separation based on size exclusion. But if traditionally prepared by solvothermal methods, it shows only negligible selectivity due to the linker mobility. Here, approximate to 500 nm-thin hybrid ZIF-7(x)-8 membranes with suppressed linker mobility and narrowed window aperture are prepared by a fast current-driven synthesis (FCDS) within 20 min. The in situ electric field during FCDS allows the formation of stiffened ZIF-8_Cm as parent skeleton and the mixed-linker strategy is applied to narrow the aperture size simultaneously. The ZIF-7(22)-8 membrane shows significantly sharpened molecular sieving for CO2/CH4 with a separation factor above 25, which soared tenfold compared with other unmodified ZIF-8 membranes. Additionally, the membrane shows exceptional separation performance for H-2/CH4 and CO2/N-2, with separation factors of 71 and 20, respectively. After 180 h temperature swing operation, it still maintains the excellent separation performance.
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