期刊
JOURNAL OF MEMBRANE SCIENCE
卷 472, 期 -, 页码 29-38出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.08.038
关键词
ZIF-8 membrane; Aqueous synthesis; Seeding-free; In situ growth; Gas permeation
资金
- MEXT-Supported Program for the Strategic Research Foundation at Private Universities [S1201026]
- Japan Society for the Promotion of Science (JSPS) [KAKENHI 25790019]
- Grants-in-Aid for Scientific Research [25790019] Funding Source: KAKEN
Zeolitic imidazolate frameworks (ZIFs) have received attention for membrane separation applications due to their zeolite-like permanent porosity and tunable uniformly sized micropores. Although aqueous room temperature synthesis has apparently opened up environmental friendly and efficient ways to synthesize ZIFs, it poses challenges for membrane preparation including unavoidable homogeneous nucleation. Many ZIF membranes prepared in an aqueous system are based On conventional secondary seeded growth techniques for zeolite membranes in spite of well-recognizing that the coordination chemistry of ZIFs is fundamentally different from the covalent chemistry of zeolites. In this study, we first applied a support-surface activation approach to promote heterogeneous nucleation followed by crystal growth in the aqueous system. Continuous well-intergrown ZIF-8 membranes were successfully grown on alpha-alumina porous support using zinc acetate and showed relatively-high hydrogen permeance of 6.9 x 10(-7) mol/m(2) s Pa with corresponding ideal separation selectivity of 13.6 for the hydrogen/methane. The competitive interaction between the coordination of constructing framework and zinc-acetate interaction by carboxylate functionality of acetate anions is essential to control heterogeneous nucleation and membrane growth. Avoiding the seeding process and reducing the use of organic solvents can provide potential for improving a reproducible, scalable, and commercializable process configuration for membrane preparation. (C) 2014 Elsevier B.V. All rights reserved,
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