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Room Temperature Fabrication of Oriented Zr-MOF Membrane with Superior Gas Selectivity with Zirconium-oxo Cluster Source
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  • Jiahui Yan,
  • Taotao Ji,
  • Yanwei Sun,
  • Shengyan Meng,
  • Chen Wang,
  • Yi Liu
Jiahui Yan
Dalian University of Technology

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Yanwei Sun
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Shengyan Meng
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Rational structural design and engineering of MOF membranes is promising for energy-efficient separation. Preferred orientation manipulation delegates an effective approach to improve their separation performance, while room-temperature (RT) synthetic protocol is beneficial to foster their industrial batch production. Nevertheless, it remains challenging to fabricate highly oriented MOF membranes at RT; simultaneously, the density of defective sites in the framework, which is assumed to exert significant influence on the separation performance relying on high affinity-interactions between guest molecules and coordinatively-unsaturated open metal sites, should be deliberately tailored. In this study, we achieve RT synthesis of highly (111)-oriented UiO-66 membrane exhibiting high defect density in the framework through employing Zr6O4(OH)4(OAc)12 clusters as zirconium source. Prepared membrane manifests an ideal CO2/N2 selectivity of 46.2, which represents the highest value among pure MOF membranes tested in comparable operating conditions. This protocol is expected be expanded for facile and mild preparation of state-of-the-art MOF membranes.
Nov 2022Published in Journal of Membrane Science volume 661 on pages 120959. 10.1016/j.memsci.2022.120959