Actinide-lanthanide co-extraction by rigidified diglycolamides

作者：Macerata Elena^*; Ossola Annalisa; Panzeri Walter; Giola Marco; Faroldi Federica; Tinonin Dario Alberto; Mele Andrea; Casnati Alessandro^*; Mariani Mario

来源：Solvent Extraction and Ion Exchange, 2018, 36(1): 41-53.

DOI：10.1080/07366299.2017.1415670

• Partitioning
• An-Ln co-extraction
• TODGA
• radioactive waste treatment
• diglycolamides
• ligand preorganization

Within the actinide and lanthanide co-extraction strategy, three rigidified diglycolamides, namely 2,6-bis (N-dodecyl-carboxamide)-4-oxo-4H-pyran (1), 2,6-bis-[ N-(4-tert-butylphenyl) carboxamide]-4-oxo-4H-pyran (2), 2,6-bis[(Ndocecyl- N-methyl) carboxamide]-4-methoxy-tetrahydro-pyran (3), were synthesized. Moreover, the effect of structural rigidification on Am(III) and Eu (III) extraction under different conditions was investigated. The carboxamide extractant 3 resembles the extracting behavior of N, N, N', N'-tetraoctyl diglycolamide (TODGA) in terms of efficiency and affinity within the lanthanide family, together with fast kinetics and satisfactory cation back-extraction. The presence of 1-octanol in the diluent mixture strongly affects the ligand stability. Moreover, despite the low extraction efficiency showed by 1 and 2, all the three ligands exhibit a higher affinity for Am with respect to TODGA, resulting in a lower lanthanide/ Americium separation factor, of around 4 for ligand 3 and close to 1 for ligands 1 and 2.

• 出版日期2018