在一系列具有特殊辐射稳定的功能化金属有机框架内直接观察增强结合
Jiangnan Li1,2, Xinran Zhang1, Mengtian Fan1
1Department of Chemistry, University of Manchester, Manchester, M13 9PL, U.K.
Journal of the American Chemical Society
|May 7, 2024
概括
新的金属有机框架显示出高 (I2) 吸收和放射性废物清理的特殊稳定性. 像-NH2和-CC这样的功能组增强了的结合和包装密度,显示出对高效吸收材料的希望.
科学领域:
- 材料科学
- 化学学
- 核工程
背景情况:
- 吸收材料需要优化活性点和在辐射下稳定,以有效储存 (I2).
- 金属有机框架 (MOF) 是气体储存和分离应用的有希望的候选者.
研究的目的:
- 直接观察和量化 (I2) 结合的一系列基于Cu (II) 的同结构金属有机框架 (MOF).
- 研究各种功能组对I2吸收,包装密度和辐射下的稳定性的影响.
主要方法:
- 合成和描述五种基于同结构的Cu (II) 的MOF:MFM-170,MFM-172,MFM-174,NJU-Bai20和NJU-Bai21,包含多种功能组 (-H, -CH3, -NH2, -CC-, -CONH-).
- 使用现场晶体学研究直接观察I2结合.
- 通过固态核磁共振,X射线光电和拉曼光谱来确认相互作用.
- 在玛辐射下的稳定性评估.
主要成果:
- MFM-170的可逆吸收量为3.37g/g,包装密度高达4.41g/cm3.
- 加入 -NH2 (MFM-174) 和 -CC- (NJU-Bai20) 部分,增强了 I2 的结合力,达到 3.91 g/g.
- MFM-174的I2密度达到了4.83g/cm3,相当于固体的密度.
- 在现场研究发现功能组和I2之间的分子和化学相互作用 (I·N,I·H2N,I·CC).
- MFM-170,MFM-174和NJU-Bai20显示出对马辐射的超抗性.
结论:
- 功能化MOF,特别是具有-NH2和-CC-组的MOF,显著提高的储存能力和包装密度.
- 观察到的相互作用为I2吸附机制提供了洞察力.
- 这些MOF在辐射下的特殊稳定性凸显了其在有效清理放射性废物方面的潜力.
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