期刊
CRYSTENGCOMM
卷 17, 期 7, 页码 1576-1582出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ce02322f
关键词
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资金
- National Natural Science Foundation of China [NSFC 21271154]
- National Basic Research Program of China 973 Program [2015CB655302]
- Natural Science Foundation [LR14E020001]
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 mu m, exhibited H-2 permeance of 7.68 x 10(-6) mol s(-1) Pa-1 m(-2) at room temperature, with ideal selectivities for H-2/CH4 and H-2/N-2 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.
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