Efficient Capture and Separation of Xenon/Krypton from Off-Gas by a Radiation-Resistant Metal–Organic Framework

IF 12.1 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-10-03 DOI:10.1002/smll.202508918

Thien D Duong, Jiangnan Li, Ruohan Li, Xin Lian, Yinlin Chen, Jiarui Fan, Joseph Hurd, Lixia Guo, Daniel Lee, Mark Warren, Sihai Yang

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Abstract

The capture of xenon (Xe) and krypton (Kr) from the off-gas of used nuclear fuel is of great importance to the treatment of radioactive wastes and production of high purity Xe. Solid sorbents, in particular metal–organic frameworks (MOFs), show promise in gas capture. However, the unknown radiation resistance of MOFs has limited their development. Herein, the efficient capture and separation of Xe/Kr by MFM-520, which strikes a remarkable stability toward 1750 kilogray (kGy) γ-irradiation, is reported. Under ambient conditions, dynamic breakthrough experiments confirm the efficient separation performance, yielding a Xe capacity of 66 and 0.2 mg g⁻¹ from a by-product of air separation (Xe/Kr: 20/80; v/v) and off-gas (Xe/Kr: 400/40 ppm balance in air), respectively. In situ synchrotron X-ray single crystal diffraction and solid-state nuclear magnetic resonance (ssNMR) studies reveal that the optimal micropore of MFM-520 underpins specific host-guest interactions to Xe, resulting in selective Xe capture.

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抗辐射金属有机骨架在废气中氙/氪的高效捕获和分离

从乏燃料废气中捕获氙（Xe）和氪（Kr）对放射性废物的处理和生产高纯氙具有重要意义。固体吸附剂，特别是金属有机框架（mof），在气体捕获方面显示出前景。然而，mof的抗辐射性能尚不清楚，限制了其发展。本文报道了MFM-520对Xe/Kr的高效捕获和分离，并在1750 kGy γ辐照下具有显著的稳定性。在环境条件下，动态突破实验证实了高效的分离性能，从空气分离副产物（Xe/Kr: 20/80; v/v）和废气（Xe/Kr: 400/40 ppm平衡空气）中分别产生66和0.2 mg g - 1的Xe容量。原位同步x射线单晶衍射和固态核磁共振（ssNMR）研究表明，MFM-520的最佳微孔支持特定的主-客相互作用，从而导致选择性的Xe捕获。

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

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