TY  - CONF
AU  - Diaz Gomez, Laura Johana
AU  - Weßling, Patrik
AU  - Wilden, Andreas
AU  - Modolo, Giuseppe
TI  - Preliminary extraction and characterization studies of water-soluble octa carboxylic acids for the separation of trivalent actinides
M1  - FZJ-2023-02407
PY  - 2023
AB  - 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).
T2  - IEK-6 Institutsseminar
CY  - ,  (Germany)
M2  - , Germany
LB  - PUB:(DE-HGF)31
UR  - https://juser.fz-juelich.de/record/1008574
ER  -