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Issue 7, 2015
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Room temperature synthesis of ZIF-8 membranes from seeds anchored in gelatin films for gas separation

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Abstract

We developed a new approach to synthesize MOF seeds by directly growing ZIF-8 seeds from zinc hydroxide nanostrands (ZHNs)/gelatin composite thin films. The ZIF-8 seeds were anchored firmly and partially in the gelatin film, which could overcome the poor bonding between the substrate and the MOF layer. Using these seeds, after second growth, a dense and well intergrown ZIF-8/gelatine thin film composite membrane was obtained. The different proportions of gelatin mixed with ZHNs influenced the density of the seeds, accordingly affecting the quality of the final ZIF-8/gelatin membranes. The continuous and well intergrown membranes with a ZIF-8 layer of about 2 μm, exhibited H2 permeance of 7.68 × 10−6 mol s−1 Pa−1 m−2 at room temperature, with ideal selectivities for H2/CH4 and H2/N2 gases of 14.2 and 9.4, respectively, far beyond the Knudsen selectivity. Similarly, an HKUST-1 seeds/gelatin thin film was also synthesized. This process holds the potential for synthesis of other MOF membranes on various substrates.

Graphical abstract: Room temperature synthesis of ZIF-8 membranes from seeds anchored in gelatin films for gas separation

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Publication details

The article was received on 24 Nov 2014, accepted on 24 Dec 2014 and first published on 06 Jan 2015


Article type: Paper
DOI: 10.1039/C4CE02322F
Citation: CrystEngComm, 2015,17, 1576-1582
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    Room temperature synthesis of ZIF-8 membranes from seeds anchored in gelatin films for gas separation

    P. Hu, Y. Yang, Y. Mao, J. Li, W. Cao, Y. Ying, Y. Liu, J. Lei and X. Peng, CrystEngComm, 2015, 17, 1576
    DOI: 10.1039/C4CE02322F

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