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Pressure‐Responsive Two‐Dimensional Metal–Organic Framework Composite Membranes for CO 2 Separation
Author(s) -
Ying Yunpan,
Zhang Zhengqing,
Peh Shing Bo,
Karmakar Avishek,
Cheng Youdong,
Zhang Jian,
Xi Lifei,
Boothroyd Chris,
Lam Yeng Ming,
Zhong Chongli,
Zhao Dan
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202017089
Subject(s) - permeance , membrane , permeation , oxide , gas separation , graphene , chemical engineering , materials science , metal organic framework , molecular dynamics , selectivity , nanotechnology , chemistry , adsorption , organic chemistry , computational chemistry , catalysis , metallurgy , engineering , biochemistry
The regulation of permeance and selectivity in membrane systems may allow effective relief of conventional energy‐intensive separations. Here, pressure‐responsive ultrathin membranes (≈100 nm) fabricated by compositing flexible two‐dimensional metal–organic framework nanosheets (MONs) with graphene oxide nanosheets for CO 2 separation are reported. By controlling the gas permeation direction to leverage the pressure‐responsive phase transition of the MONs, CO 2 ‐induced gate opening and closing behaviors are observed in the resultant membranes, which are accompanied with the sharp increase of CO 2 permeance (from 173.8 to 1144 gas permeation units) as well as CO 2 /N 2 and CO 2 /CH 4 selectivities (from 4.1 to 22.8 and from 4 to 19.6, respectively). The flexible behaviors and separation mechanism are further elucidated by molecular dynamics simulations. This work establishes the relevance of structural transformation‐based framework dynamics chemistry in smart membrane systems.