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通过一种耐辐射的金属有机框架有效地捕获和分离离子//离子

Thien D Duong¹, Jiangnan Li¹, Ruohan Li¹

¹College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.

Small (Weinheim an der Bergstrasse, Germany)

|October 3, 2025

概括

金属有机框架 (MOFs) 显示出从核燃料脱气中捕获 (Xe) 和 (Kr) 的前景. MFM-520表现出卓越的辐射稳定性和选择性XE捕获,推进了放射性废物处理.

科学领域:

材料科学材料科学材料科学
核工程核工程是指核工程.
化学化学化学

背景情况:

放射性废物处理和高纯度的生产需要有效捕获 (Xe) 和 (Kr).
金属有机框架 (MOFs) 是气体捕获的有希望的固体吸附剂,但它们的辐射抵抗性在很大程度上是未知的.
对于核应用的MOFs的开发受到影响,因为人们担心它们在辐射下的稳定性.

研究的目的:

为了研究金属有机框架MFM-520.20的抗辐射和Xe / Kr分离能力.
评估MFM-520在从不同的气体混合物中捕获XE的性能,包括核燃料脱气.
为了阐明MFM-520选择性Xe捕获背后的机制.

主要方法:

在环境条件下进行了动态突破实验,以评估 Xe/Kr 分离性能.
用高达1750千克格雷 (kGy) 的γ-辐射来测试MFM-520的辐射稳定性.
在现场同步龙X射线单晶衍射和固态核磁共振 (ssNMR) 被用来研究材料结构和宿主-客人相互作用.

主要成果:

在暴露于1750kGy γ辐射后,MFM-520表现出了显著的稳定性.
实现了Xe与Kr的高效分离,Xe容量为66 mgg-1来自空气分离副产品 (Xe/Kr:20/80) 和0.2 mgg-1来自核废气 (Xe/Kr:400/40 ppm).
结构研究表明,MFM-520的优化微孔结构促进了与 Xe 的特定相互作用,从而导致选择性捕获.

结论:

MFM-520是一种非常稳定的金属有机框架,适合Xe/Kr分离.
该材料显示了放射性废物处理和高纯度生产中的应用潜力.
独特的微孔结构和宿主-客人相互作用是MFM-520选择性异捕获的关键.

关键词:

金属有机框架气体外的气体外气体分离式隔离器的使用方法在Xenon,Xenon就是Xenon.γ-辐射的辐射.

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