College of Chemistry, Sichuan University, Chengdu 610064, P. R. China.
Inorg Chem. 2022 Aug 29;61(34):13293-13305. doi: 10.1021/acs.inorgchem.2c00675. Epub 2022 Aug 17.
Effective and selective separation and recovery of the fission product palladium from high-level liquid waste are conducive not only to reducing its hazards to the public health and environment but also to alleviate the pressure on the increasing demand for natural palladium. Herein, the Pd extraction in an HNO solution with a nitrilotriacetate-derived triamide ligand NTAamide(-Oct) and the complexation between them were investigated. Using -octanol as a diluent, NTAamide(-Oct) demonstrated an excellent selectivity, strong extractability, and high loading capacity for Pd extraction. Combined with the results of single-crystal X-ray diffraction, Fourier transform infrared spectroscopy, electrospray ionization-mass spectroscopy, microcalorimetric titration, and slope analysis, the extracted complexes were determined as PdL and [PdL][Pd(NO)] (where L denotes the NTAamide ligand) in 0.10 and 3.0 mol/L HNO solutions, respectively. The extraction model closely depended on the solvation state of Pd in the HNO solution. An ion-pair extraction model was proposed and discussed.
有效且选择性地从高放废液中分离和回收裂变产物钯不仅有利于降低其对公众健康和环境的危害，也有利于缓解对日益增长的天然钯需求的压力。在此，研究了硝酸溶液中用腈三乙酸衍生的三酰胺配体 NTAamide(-Oct) 萃取钯以及它们之间的络合作用。以正辛醇为稀释剂，NTAamide(-Oct) 对钯萃取表现出优异的选择性、强萃取性和高负载能力。结合单晶 X 射线衍射、傅里叶变换红外光谱、电喷雾电离质谱、微量热滴定和斜率分析的结果，确定在 0.10 和 3.0 mol/L HNO 溶液中萃取的配合物分别为PdL和[PdL][Pd(NO)]（其中 L 表示 NTAamide 配体）。萃取模型密切依赖于 Pd 在 HNO 溶液中的溶剂化状态。提出并讨论了一种离子对萃取模型。
