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  • Title: Self-Adjusting Metal-Organic Framework for Efficient Capture of Trace Xenon and Krypton.
    Author: Niu Z, Fan Z, Pham T, Verma G, Forrest KA, Space B, Thallapally PK, Al-Enizi AM, Ma S.
    Journal: Angew Chem Int Ed Engl; 2022 Mar 07; 61(11):e202117807. PubMed ID: 35020976.
    Abstract:
    The capture of the xenon and krypton from nuclear reprocessing off-gas is essential to the treatment of radioactive waste. Although various porous materials have been employed to capture Xe and Kr, the development of high-performance adsorbents capable of trapping Xe/Kr at very low partial pressure as in the nuclear reprocessing off-gas conditions remains challenging. Herein, we report a self-adjusting metal-organic framework based on multiple weak binding interactions to capture trace Xe and Kr from the nuclear reprocessing off-gas. The self-adjusting behavior of ATC-Cu and its mechanism have been visualized by the in-situ single-crystal X-ray diffraction studies and theoretical calculations. The self-adjusting behavior endows ATC-Cu unprecedented uptake capacities of 2.65 and 0.52 mmol g-1 for Xe and Kr respectively at 0.1 bar and 298 K, as well as the record Xe capture capability from the nuclear reprocessing off-gas. Our work not only provides a benchmark Xe adsorbent but proposes a new route to construct smart materials for efficient separations.
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