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

作　　者：修涛元 张萌 叶国安 矫彩山[1] 袁立永[2] 石伟群[2] XIU Taoyuan;ZHANG Meng;YE Guoan;JIAO Caishan;YUAN Liyong;SHI Weiqun(College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]哈尔滨工程大学核科学与技术学院,黑龙江哈尔滨150001 [2]中国科学院高能物理研究所,北京100049 [3]中国原子能科学研究院,北京102413

出　　处：《哈尔滨工程大学学报》2023年第12期2177-2184,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(U1967216,22076188,U20B2019,21876174).

摘　　要：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.

关 键 词：联吡啶 二酰胺 萃取 反萃 铀 钼 分离 配位机理 

分 类 号：TL241.1[核科学技术—核燃料循环与材料]