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Two‐Dimensional Metal–Organic Framework Nanosheets for Membrane‐Based Gas Separation
Author(s) -
Peng Yuan,
Li Yanshuo,
Ban Yujie,
Yang Weishen
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201703959
Subject(s) - nanosheet , membrane , permeance , exfoliation joint , gas separation , materials science , metal organic framework , lamellar structure , chemical engineering , nanotechnology , molecular sieve , chemistry , organic chemistry , graphene , composite material , catalysis , permeation , biochemistry , adsorption , engineering
Abstract Metal–organic framework (MOF) nanosheets could serve as ideal building blocks of molecular sieve membranes owing to their structural diversity and minimized mass‐transfer barrier. To date, discovery of appropriate MOF nanosheets and facile fabrication of high performance MOF nanosheet‐based membranes remain as great challenges. A modified soft‐physical exfoliation method was used to disintegrate a lamellar amphiprotic MOF into nanosheets with a high aspect ratio. Consequently sub‐10 nm‐thick ultrathin membranes were successfully prepared, and these demonstrated a remarkable H 2 /CO 2 separation performance, with a separation factor of up to 166 and H 2 permeance of up to 8×10 −7 mol m −2 s −1 Pa −1 at elevated testing temperatures owing to a well‐defined size‐exclusion effect. This nanosheet‐based membrane holds great promise as the next generation of ultrapermeable gas separation membrane.