Direct Growth of Ultrathin ZIF-8 Membrane on Graphene Nanoribbon Treated Polymeric Support for hydrogen/hydrocarbon Separation
발표자
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초록
내용
Zeolitic imidazolate framework-8 (ZIF-8) membranes are promising to separate hydrogen/hydrocarbon mixture due to its precise molecular sieving property. To maximize the separation efficiency with high permeance and selectivity, it is required to form ultrathin ZIF-8 layer on porous support without defects. However, previous ZIF-8 based membranes were usually thick (~1 μm) and mainly fabricated on inorganic supports because the precursors for ZIF-8 films were passed through into the porous supports and the overgrowth of ZIF-8 film were occurred. Herein, graphene oxide nanoribbons (GONR) were deposited on porous polymeric support and ZIF-8 layer was directly grown on its top surface. The thickness of the ZIF-8 layer is ultrathin around 400 nm because the GONR layer blocks the overgrowth of ZIF-8 film into the porous support. The ZIF-8 membrane showed high permeance and selectivity for hydrogen because of its ultrathin thickness and negligible gas flow resistance through the GONR layer.