将分子限制在坚固的金属有机框架中的三链中
Xinran Zhang1, Ivan da Silva2, Harry G W Godfrey1
1School of Chemistry, University of Manchester , Manchester M13 9PL, U.K.
Journal of the American Chemical Society
|October 13, 2017
概括
研究人员开发了先进的金属有机框架 (MFM-300) 以有效捕获放射性 (I2). 对于核废物管理和可持续能源而言,MFM-300显示出高容量和可逆吸收.
科学领域:
- 材料科学
- 核化学
- 有孔的材料
背景情况:
- 在核废弃物处理过程中释放的放射性 (I2) 给环境带来了风险.
- 有效的捕获材料对于可持续的核能至关重要,需要高容量,稳定性和储存密度.
- 通过高存储密度最大限度地减少系统体积对于实际应用至关重要.
研究的目的:
- 报告用于高 (I2) 吸附的强多孔金属有机材料 (MFM-300) 的开发.
- 研究MFM-300的吸收能力,稳定性和储存密度.
- 阐明物质内的的分子级结合相互作用和聚合行为.
主要方法:
- 一系列MFM-300 (M) 材料的合成和表征 (M = Al, Sc, Fe, In).
- 使用XPS,TGA-MS,同步X射线衍射,PDF分析,拉曼,太赫兹和中子光谱的I2吸附的综合分析.
- 密度函数理论 (DFT) 建模以了解主机-I2 和 I2-I2 相互作用.
主要成果:
- MFM-300 ((Sc) 显示完全可逆的I2摄入量为1.54gg-1的结构完整性保持.
- 详细了解I2结合位点的分子水平 (I2^I在基附近,I2^II间位) 和动态.
- 在高负载下观察I2的自我聚合成三螺旋链,达到3.08gcm-3的特殊储存密度.
结论:
- MFM-300 ((Sc) 是一种高效的放射性捕获材料,具有高容量和可逆吸收.
- 这项研究提供了前所未有的结晶学洞察力,
- 由于MFM-300的特殊储存密度,它成为减少核废物储存量的有希望的候选物.
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