Efficacious selective separation of U(Ⅵ) over Mo(Ⅵ) using novel 2,9-diamide-1,10-phenanthroline ligands: Liquid-liquid extraction and coordination chemistry  

作　　者：Taoyuan Xiu Simei Zhang Peng Ren Siyan Liu Shuai Wang Hamza Shehzad Jingyang Wang Meng Zhang Guoan Ye Caishan Jiao Qunyan Wu Liyong Yuan Zhifang Chai Weiqun Shi 

机构地区：[1]College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China [2]Laboratory of Nuclear Energy Chemistry,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]China Institute of Atomic Energy,Beijing 102413,China [4]State Key Laboratory of Nuclear Resources and Environment,School of Nuclear Science and Technology,East China University of Technology,Nanchang 330013,China [5]School of Chemistry,University of the Punjab,Lahore 54590,Pakistan

出　　处：《Chinese Chemical Letters》2023年第11期163-168,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.U1967216,22076188,U20B2019,21876174);the National Science Fund for Distinguished Young Scholars(No.21925603).

摘　　要：Uranium and molybdenum are important strategic elements. The production of ^(99)Mo and the hydrometallurgical process of uranium ore face difficult problems of separation of uranium and molybdenum.In this study, the four phenanthroline diamide ligands were synthesized, and extraction and stripping experiments were performed under different conditions to evaluate the potential application of these ligands for separation of U(Ⅵ) over Mo(Ⅵ). With the growth of alkyl chain, the solubility of ligands could be greatly improved, and the separation effect of U(Ⅵ) over Mo(Ⅵ) gradually increased. The SF_(U/Mo) were around 10,000 at 4 mol/L HNO3. Three stripping agents were tested with the stripping efficiency of Na_(2)CO_(3)(5%) > H_(2)O > HNO_(3)(0.01 mol/L). The stripping percentages of the three stripping agents were all close to unity, indicating that the ligands had the potential to be recycled. The chemical stoichiometry of U(Ⅵ) complexes with ligands was evaluated as 1:1 using electrospray ionization mass spectrometry,ultraviolet visible spectroscopy and single-crystal X-ray diffraction. The consistency between theoretical calculation and experimental results further explains the coordination mechanism.

关 键 词：Phenanthroline diamide ligand URANIUM MOLYBDENUM Solvent extraction Coordination chemistry 

分 类 号：O62[理学—有机化学]