三-基酸与三-基酸复杂化与Th (IV),U (VI) 和Nd (III):从理论到实验
Aditya Ramesh Sachin1,2,3, Balija Sreenivasulu1,2, Cherukuri Venkata Siva Brahmananda Rao1,2
1Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India.
The journal of physical chemistry. A
|September 6, 2024
概括
密度函数理论显示,三异胺酸盐 (TiAP) 和三丁酸盐 (TBP) 配体优先复合于U (VI) 和Th (IV) 而不是Nd (III). 复杂的稳定性受到结构特征和能量贡献的影响,指导溶剂提取过程.
科学领域:
- 核化学 核化学 核化学
- 计算化学计算化学
- 材料科学 材料科学 材料科学
背景情况:
- 溶剂提取对于分离活性化物和化物至关重要.
- 了解连接体复杂化行为是优化分离效率的关键.
- 三异胺酸盐 (TiAP) 和三丁酸盐 (TBP) 是核燃料再加工中的常见配体.
研究的目的:
- 通过使用DFT,研究U(VI),Th(IV) 和Nd(III) 与TiAP和TBP的复合.
- 为了将理论计算与实验溶剂提取数据的相关性.
- 阐明控制合金复合体稳定性的结构和能量因素.
主要方法:
- 密度函数理论 (DFT) 的计算.
- 合金复合物的量子化学建模.
- 能量分解分析 (EDA).
- 与实验性交叉电流溶剂提取数据的比较.
主要成果:
- 对于TiAP和TBP复合体,DFT计算预测了相同的协调几何.
- 复合能表示一个优选的提取顺序:U(VI) > Th(IV) > Nd(III).
- 在分离过程中增加了Th(IV) 负载抑制了RE(III) 提取.
- 结构特征 (对称,二极矩) 和EDA (几何应变,分散) 对于复杂的稳定性至关重要.
结论:
- DFT准确地模拟了TiAP和TBP的复合行为,其中包括U(VI),Th(IV和Nd(III).
- 理论发现与实验溶剂提取结果一致,验证了计算方法.
- 体结构和电子相互作用是溶剂提取分离效率的主要驱动因素.
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