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Implementation of a Core-Shell Design Approach for Constructing MOFs for CO 2 Capture
Adsorption-based capture of CO from flue gas and from air requires materials that have a high affinity for CO and can resist water molecules that competitively bind to adsorption sites. Here, we present a core-shell metal-organic framework (MOF) design strategy where the core MOF is designed to sele...
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Published in: | ACS applied materials & interfaces 2023-05, Vol.15 (19), p.23337-23342 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Adsorption-based capture of CO
from flue gas and from air requires materials that have a high affinity for CO
and can resist water molecules that competitively bind to adsorption sites. Here, we present a core-shell metal-organic framework (MOF) design strategy where the core MOF is designed to selectively adsorb CO
, and the shell MOF is designed to block H
O diffusion into the core. To implement and test this strategy, we used the zirconium (Zr)-based UiO MOF platform because of its relative structural rigidity and chemical stability. Previously reported computational screening results were used to select optimal core and shell MOF compositions from a basis set of possible building blocks, and the target core-shell MOFs were prepared. Their compositions and structures were characterized using scanning electron microscopy, transmission electron microscopy, and powder X-ray diffraction. Multigas (CO
, N
, and H
O) sorption data were collected both for the core-shell MOFs and for the core and shell MOFs individually. These data were compared to determine whether the core-shell MOF architecture improved the CO
capture performance under humid conditions. The combination of experimental and computational results demonstrated that adding a shell layer with high CO
/H
O diffusion selectivity can significantly reduce the effect of water on CO
uptake. |
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ISSN: | 1944-8244 1944-8252 |
DOI: | 10.1021/acsami.3c03457 |