Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 48, Pages 17245-17255Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201503078
Keywords
adsorbents; metalated-ligand exchange; metal-organic frameworks; mesoporous materials; UiO-66
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Funding
- National University of Singapore [CENGas R-261-508-001-646]
- Singapore Ministry of Education (MOE AcRF) [R-279-000-410-112, R-279-000-429-112]
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The strategy to functionalize water-stable metalorganic frameworks (MOFs) in order to improve their CO2 uptake capacities for efficient CO2 separation remains limited and challenging. We herein present an effective approach to functionalize a prominent water-stable MOF, UiO-66(Zr), by a combination of optimization and metalated-ligand exchange. In particular, by systematic optimization, we have successfully obtained UiO-66(Zr) of the highest BET surface area reported so far (1730 m(2)g(-1)). Moreover, it shows a hybrid Type I/IV N-2 isotherm at 77 K and a mesopore size of 3.9 nm for the first time. The UiO-66 MOF underwent a metalated-ligand-exchange (MLE) process to yield a series of new UiO-66-type MOFs, among which UiO-66-(COONa)(2)-EX and UiO-66-(COOLi)(4)-EX MOFs have both enhanced CO2 working capacity and IAST CO2/N-2 selectivity. Our approach has thus suggested an alternative design to achieve water-stable MOFs with high crystallinity and gas uptake for efficient CO2 separation.
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