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Preparation and Gas Permeability of ZIF-7 Membranes Prepared via Two-step Crystallization Technique
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  • Journal title : Korean Chemical Engineering Research
  • Volume 52, Issue 3,  2014, pp.340-346
  • Publisher : The Korean Institute of Chemical Engineers
  • DOI : 10.9713/kcer.2014.52.3.340
 Title & Authors
Preparation and Gas Permeability of ZIF-7 Membranes Prepared via Two-step Crystallization Technique
Li, Fang; Li, Qiming; Bao, Xinxia; Gui, Jianzhou; Yu, Xiaofei;
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Continuous and dense ZIF-7 membranes were successfully synthesized on porous substrate via two-step crystallization technique. ZIF-7 seeding layer was first deposited on porous substrate by in-situ low temperature crystallization, and then ZIF-7 membrane layer can be grown through the secondary high-temperature crystallization. Two synthesis solutions with different concentration were used to prepare ZIF-7 seeding layer and membrane layer on porous substrate, respectively. As a result, a continuous and defect-free ZIF-7 membrane layer can be prepared on porous substrate, as confirmed by scanning electron microscope. XRD characterization shows that the resulting membrane layer is composed of pure ZIF-7 phase without any impurity. A single gas permeation test of , , or was conducted based on our prepared ZIF-7 membrane. The ZIF-7 membrane exhibited excellent H2 molecular sieving properties due to its suitable pore aperture and defect-free membrane layer.
ZIF-7 Membrane;Two-step Crystallization;Precursor Solution;Gas Permeation;
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