联吡啶二酰胺配体对U(Ⅵ)/Mo(Ⅵ)的萃取分离及机理

The study on the extraction separation and mechanism of U(Ⅵ)/Mo(Ⅵ)by bipyridine diamide ligands

针对U(Ⅵ)/Mo(Ⅵ)分离的问题,本文合成了3种不同烷基取代基的联吡啶二酰胺配体。采用溶剂萃取和光谱分析分别探究配体对U(Ⅵ)/Mo(Ⅵ)分离性能和萃取机理。实验结果表明:3种配体均可以实现U(Ⅵ)和Mo(Ⅵ)之间的高效分离,分离因子在最优条件下甚至达到~2000。选用3种反萃剂进行反萃实验,3次反萃率均接近100%,该类配体具有良好的循环利用潜力。结合斜率分析、质谱滴定和红外光谱等手段进一步阐述相关配位化学及萃取机理。3种配体均可以实现U(Ⅵ)/Mo(Ⅵ)的高效分离,为U(Ⅵ)/Mo(Ⅵ)分离配体设计提供了重要参考。

This study synthesized three bipyridine diamide ligands with different alkyl substituents to solve the prob-lem of U(Ⅵ)/Mo(Ⅵ)separation.Solvent extraction and spectroscopic analysis were employed to examine the effect of the ligand on the separation performance and extraction mechanism of U(Ⅵ)/Mo(Ⅵ),respectively.The results show that the three ligands have excellent separation effects on U(Ⅵ)/Mo(Ⅵ),and the separation factor reaches approximately 2000 under the optimal condition.Three different stripping agents were designated to carry out the stripping experiments.The three stripping rates were approximately 100%,indicating that the newly fabri-cated ligands had excellent recycling potential.Relevant coordination chemistry and extraction mechanisms were further described through slope analysis,mass spectrometry titration,and infrared spectroscopy.The three ligands can realize high U(Ⅵ)/Mo(Ⅵ)separation efficiency.Moreover,this study provides an important reference for the design of U(Ⅵ)/Mo(Ⅵ)separation ligands.