Adsorptive separation of xenon/krypton mixtures using ligand controls in a zirconium-based metal-organic framework

Seung Joon Lee, Seongwoo Kim, Eun Jung Kim, Min Kim, Youn-Sang Bae

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11 Citations (Scopus)


A Zr-based metal-organic framework (MOF), UiO-66, is considered to be one of the most stable MOFs and has recently been shown to be a good candidate for adsorptive separation of Xe/Kr mixtures. Since the ability to impart chemical functionalities is an attractive characteristic of MOFs, herein, we prepared a series of functionalized UiO-66 materials (UiO-66-NH2, UiO-66-(OMe)2, UiO-66-NH2(OMe)2, and UiO-66-F4) by incorporating several polar functionalities into UiO-66. We found that series of electron-rich and electron-deficient UiO-66 materials have stronger interactions with Xe and Kr atoms than pristine UiO-66. We also found that Xe/Kr selectivity increases with the electron density of the ligand. Although there was a reduction in surface area, UiO-66-NH2(OMe)2 exhibited the highest Xe/Kr Henry's constant ratio (14.4), possibly due to having the highest electron density as well as an unsymmetrical arrangement of functional groups of the ligands. Furthermore, the breakthrough experiments show that UiO-66-NH2(OMe)2 can effectively separate Xe from Kr under dynamic mixture conditions and can be easily regenerated under a mild regeneration condition.

Original languageEnglish
Pages (from-to)345-351
Number of pages7
JournalChemical Engineering Journal
Publication statusPublished - 2018 Mar 1


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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