和甲/甲酸协调聚合物和框架
Mohammad Shohel1, A Kirstin Sockwell2, Amy E Hixon2
1Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States.
Inorganic chemistry
|January 17, 2024
概括
这项研究揭示了技术和复合体如何与和协调,为核燃料再加工提供了原子层面的见解. 了解这些相互作用对于管理废核燃料和回收有价值元素至关重要.
科学领域:
- 乙化物和化物的协调化学.
- 扩展固体的材料科学.
- 核燃料再加工和废物管理.
背景情况:
- 已耗尽的核燃料 (SNF) 含有有价值的跨化和化元素,但有问题的裂变产品,如技术-99 (99TcO4-) 阻碍了回收.
- 关于TCO4-或其代用物, (ReO4-),与动因化物和化物之间的协调化学,我们对分子层面的理解有限.
- 在SNF再加工过程中,TcO4可以与高价值金属共同提取,使分离过程复杂化.
研究的目的:
- 为了研究ReO4-/TcO4-与 (Pu) 和 (Ce) 离子的协调行为.
- 为了在结构和化学上描述由此产生的扩展固体.
- 为了获得有关SNF再处理的Pu-TcO4协调的原子级洞察力.
主要方法:
- 含有ReO4-/TcO4和Pu/Ce. 的晶体固体的合成和结构阐明.
- 利用X射线衍射和化学表征技术.
- 用 (Ce) 作为三价兰坦化物和三价氧化和四价氧化状态中的的替代物.
主要成果:
- 他们分离了七种晶体固体,揭示了ReO4-/TcO4-与PuIV,PuVIO22+,CeIII和CeIV的协调.
- 协调模式包括终端和桥梁,形成1维,2维和3维框架.
- 具体结构包括Pu (IV) -ReO4- 1D链/2D框架,一个独特的PuVIO22+-ReO4- 1D链,以及CeIII-ReO4- 3D框架. 还形成了一个混合价值的CeIII/IV-ReO4-- 2D框架.
结论:
- 该研究提供了Pu-ReO4化合物的第一个报告的晶体结构,为SNF再处理中的Pu-TcO4协调提供了关键的原子级数据.
- 协调化学扩大了对早期高价值活性化物的结合趋势的理解.
- 高酸性条件和CeIV和TcVII的潜在减少带来了挑战,只有一个TcO4含有结构被分离出来.
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