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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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通过氧化状态控制进行超高效的美洲/兰化物分离

Zhipeng Wang1, Jun-Bo Lu2, Xue Dong1

  • 1Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.

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|March 30, 2022
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概括
此摘要是机器生成的。

研究人员开发了一种新方法,通过稳定五价 (Am) 来分离美洲 (Am) 和 (Ln). 这一突破为核废物处理提供了高效的分离因子.

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科学领域:

  • 核化学
  • 放射化学
  • 分离科学

背景情况:

  • 对于核能和废物管理而言,兰化物/动化物分离至关重要.
  • 由于它们的化学性质相似,将美洲 (Am) 与 (Ln) 分离是具有挑战性的.
  • 通过氧化进行Am分离的现有方法受到较高Am氧化状态的不稳定性限制.

研究的目的:

  • 开发一种有效分离Am和Ln的新方法.
  • 稳定五价Am (Am ((V)) 以改善分离.
  • 建立一种研究Am高氧化状态化学的新方法.

主要方法:

  • Am(III) 与二甲基胺连接物的协调.
  • 在有机溶剂中使用BiV物种将Am (III) 氧化为Am (V).
  • 用于 Am/Ln 分离的溶剂提取技术.
  • 量子理论模型阐明反应机制.

主要成果:

  • 成功生成和稳定五价氨 (Am(V)).
  • 在单个提取步骤中获得Am与Ln的异常高分离系数 (>10^4).
  • 证明在有机溶剂中有效地发生协同协调和氧化过程.
  • 阐明了Am(V) 的形成和稳定机制.

结论:

  • 这种新的策略可实现稳定的Am(V) 形成,促进高效的Am/Ln分离.
  • 这种方法为核废物处理和核燃料循环带来了重大进步.
  • 开辟了探索Am高氧化状态化学的新途径.