Metal鈥揙rganic Frameworks for Removal of Xe and Kr from Nuclear Fuel Reprocessing Plants

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• 作者：Jian Liu ; Praveen K. Thallapally ; Denis Strachan
• 刊名：Langmuir
• 出版年：2012
• 出版时间：August 7, 2012
• 年：2012
• 卷：28
• 期：31
• 页码：11584-11589
• 全文大小：367K
• 年卷期：v.28,no.31(August 7, 2012)
• ISSN：1520-5827

文摘

Removal of xenon (Xe) and krypton (Kr) from process off-gases containing 400 ppm Xe, 40 ppm Kr, 78% N₂, 21% O₂, 0.9% Ar, 0.03% CO₂, and so forth using adsorption was demonstrated for the first time. Two well-known metal鈥搊rganic frameworks (MOFs), HKUST-1 and Ni/DOBDC, which both have unsaturated metal centers but different pore morphologies, were selected as novel adsorbents. Results of an activated carbon were also included for comparison. The Ni/DOBDC has higher Xe/Kr selectivities than those of the activated carbon and the HKUST-1. In addition, results show that the Ni/DOBDC and HKUST-1 can adsorb substantial amounts of Xe and Kr even when they are mixed in air. Moreover, the Ni/DOBDC can successfully separate 400 ppm Xe from 40 ppm Kr and air containing O₂, N₂, and CO₂ with a Xe/Ke selectivity of 7.3 as indicated by our breakthrough results. This shows a promising future for MOFs in radioactive nuclide separations from spent fuels.