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Preparation of a pure ZIF-67 membrane by self-conversion of cobalt carbonate hydroxide nanowires for H2 separation

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Abstract

The fabrication of integrated pure Co-based ZIF membranes on porous tubular substrates is extremely challenging. This work demonstrates the preparation of a continuous pure ZIF-67 tubular membrane by direct transformation of carbonate hydroxide nanowire arrays (Co-NWAs) in a 2-methylimidazole (Hmim) aqueous solution. This strategy included first growth of Co-NWAs on a porous ceramic tube and then self-conversion of the Co-NWAs to a continuous ZIF-67 membrane in the Hmim aqueous solution. The effects of the synthesis parameters (solvent, temperature and concentration) on the formation of the pure ZIF-67 membrane were investigated in detail. It was found that the balance between the dissolution rate of the Co-NWAs and the coordination rate of Co2+ produced with Hmim is significant in the transformation process. The obtained ZIF-67 membrane with 1.7 μm thickness exhibits a high H2 permeance of 5.59 × 10−7 mol m−2 s−1 Pa−1, and the ideal separation factors for H2/N2 and H2/CH4 are 14.7 and 15.3, respectively. Moreover, the ZIF-67 membrane demonstrates excellent stability since the Co-NWAs act as strong linkers between the membrane and the substrate. This self-conversion strategy can also be extended to the synthesis of other Co-based MOF membranes.

Graphical abstract: Preparation of a pure ZIF-67 membrane by self-conversion of cobalt carbonate hydroxide nanowires for H2 separation

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Publication details

The article was received on 12 Feb 2018, accepted on 21 Mar 2018 and first published on 21 Mar 2018


Article type: Paper
DOI: 10.1039/C8CE00238J
Citation: CrystEngComm, 2018, Advance Article
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    Preparation of a pure ZIF-67 membrane by self-conversion of cobalt carbonate hydroxide nanowires for H2 separation

    P. Nian, Y. Cao, Y. Li, X. Zhang, Y. Wang, H. Liu and X. Zhang, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00238J

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