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| Home > Publications database > Preliminary extraction and characterization studies of water-soluble octa carboxylic acids for the separation of trivalent actinides |
| Home > Publications database > Preliminary extraction and characterization studies of water-soluble octa carboxylic acids for the separation of trivalent actinides |
| Talk (non-conference) (Other) | FZJ-2023-02407 |
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2023
Abstract: Separation of An and Ln is an important part in the recycling process of nuclear fuel. Therefore, many ligands have been tested over the years and several separation processes have successfully been demonstrated on the laboratory scale (e.g., AmSel, SANEX, DIAMEX). Current research aims at the development of new ligands which are built only with carbon, hydrogen, oxygen, and nitrogen (CHON), because they can be incinerated completely withoutsecondary waste production. Within the BMUV funded SEPAM project, we tested new water-soluble ligands for the selective separation of Am(III) and Cm(III) from the trivalent Ln. These ligands have the characteristic of having eight carboxylic acid groups in the outer peripheryand differ in the central core, where the metal ion complexation occurs (pyridine, bipyridine and phenanthroline, Figure 1). These ligands might act as CHON alternatives to the sulphonated aqueous ligands used in the i- SANEX1 and AmSel2 systems (SO3-Ph-BTP, SO3-Ph-BTBP1 and AmSel2 systems (SO3-Ph-BTP, SO3-Ph-BTBP) We present results of extraction studies using the three ligands. 2,6-Bis [5,6-di(3,4-dicarboxyphenyl)-1,2,4-triazin-3-yl] pyridine (BTP-octa-COOH) showed the best results with good separation factors for Eu/Am. Therefore, BTP-octa-COOH might be an interesting new hydrophilic complexant and CHON-alternative to SO3-Ph-BTP in the i-SANEX system. The complexation of the ligand with 248Cm(III) and Eu(III) was studied using t ime resolved laser-induced spectroscopy (TRLFS) in HClO4 and HNO3 to determine the stability constants of each formed species. We present and discuss the results of extraction and TRLFS experiments. Funding for this research was provided by the Federal Ministry for the Environment, Nature Conservation, Nuclear Safety and Consumer Protection, project SEPAM (02E11921A).
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