Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 320, Issue -, Pages 513-520Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2016.08.057
Keywords
Xenon; Krypton; Rare gases; Metal-organic framework (MOF); Separation; Adsorption
Categories
Funding
- R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning)
- NST (National Research Council of Science & Technology) of the Republic of Korea [CRC-14-1-KRICT]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MI, Korea) [10048649]
- Defense Industry Technology Center (DITC) [UC15000ID]
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The separation of xenon/krypton mixtures is important for both environmental and industrial purposes. The potential of three hydrothermally stable MOFs (MIL-100(Fe), MIL-101(Cr), and UiO-66(Zr)) for use in Xe/Kr separation has been experimentally investigated. From the observed single-component Xe and Kr isotherms, isosteric heat of adsorption (Q(st)(0)), and LAST-predicted Xe/Kr selectivities, we observed that UiO-66(Zr) has the most potential as an adsorbent among the three candidate MOFs. We performed dynamic breakthrough experiments with an adsorption bed filled with UiO-66(Zr) to evaluate further the potential of UiO-66(Zr) for Xe/Kr separation under mixture flow conditions. Remarkably, the experimental breakthrough curves show that UiO-66(Zr) can efficiently separate the Xe/Kr mixture. Furthermore, UiO-66(Zr) maintains most of its Xe and Kr uptake capacity, as well as its crystallinity and internal surface area, even after exposure to gamma radiation (2 kGy) for 7 h and aging for 16 months under ambient conditions. This result indicates that UiO-66(Zr) can be considered to be a potential adsorbent for Xe/Kr mixtures under both ambient and radioactive conditions. (C) 2016 Elsevier B.V. All rights reserved.
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