Journal
NANO RESEARCH
Volume 11, Issue 4, Pages 1850-1860Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1803-0
Keywords
nanosheet; nanosheet membrane; metal organic framework membrane; oriented growth; gas separation
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Funding
- National Natural Science Foundation of China [21476039, 21076030]
- Marie Sklodowska-Curie Individual Fellowship
- U.S. Dept. of Energy, Office of Science, Basic Energy Sciences Program [DE-FG02-08ER15967]
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Shaping crystalline porous materials such as metal organic frameworks (MOFs) and zeolites into two-dimensional (2D) nanosheet forms is highly desirable for developing high-performance molecular sieving membranes. However, conventional exfoliation-deposition is complex and challenging for the large-scale fabrication of nanosheet MOF tubular membranes. Here, for the first time, we report a direct growth technique by ZnO self-conversion and ammonia assistance to fabricate zeolitic imidazolate framework (ZIF) membranes consisting of 2D nanosheets on porous hollow fiber substrates; the membranes are suitable for large-scale industrial gas separation processes. The proposed fabrication process for ZIF nanosheet membranes is based on the localized self-conversion of a pre-deposited thin layer of ZnO in a ligand solution containing ammonium hydroxide as a modulator. The resulting ZIF 2D nanosheet tubular membrane is highly oriented and only 50 nm in thickness. It exhibits excellent molecular sieving performance, with high H-2 permeance and selectivity for H-2/CO2 separation. This technique shows great promise in MOF nanosheet membrane fabrication for large-scale molecular sieving applications.
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