期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 179, 期 -, 页码 10-16出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2013.05.015
关键词
ZIF-8 film; Synthesis; Nylon membrane; Aqueous solution; Contra-diffusion
类别
资金
- Monash University
- Department of Chemical Engineering at Monash University
- Australian Research Council
ZIF-8 films were prepared on both sides of nylon membrane in aqueous solutions using a stoichiometric ratio of Zn2+ and 2-methylimidazole (hmim) by a contra-diffusion method. Both ammonium hydroxide solution and porous nylon membrane play a crucial role in promoting ZIF-8 crystallization and film formation. Ammonium hydroxide solution added in the hmim solution deprotonates hmim, and the nylon membrane separates the Zn2+ and hmim aqueous solutions with different diffusion rates through its pores, leading to appropriate concentration gradients of hmim and zinc nitrate required for ZIF-8 nucleation and growth. The synthesis conditions were systematically investigated. ZIF-8 films prepared with a Zn2+:hmim:NH4+ molar ratio of 1:2:32 at room temperature for 24 h exhibited an intergrown ZIF-8 layer on hmim side with a thickness of ca. 2.5 mu m, and gas permeation confirmed the film was continuous and compact with a H-2/N-2 ideal selectivity of 4.6. (C) 2013 Elsevier Inc. All rights reserved.
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