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000909859 037__ $$aFZJ-2022-03472
000909859 041__ $$aEnglish
000909859 1001_ $$0P:(DE-Juel1)190476$$aDiaz Gomez, Laura Johana$$b0$$eCorresponding author$$ufzj
000909859 1112_ $$aActinides Revisited (AnRev) 2022$$cDresden$$d2022-09-21 - 2022-09-23$$gAnRev 2022$$wGermany
000909859 245__ $$aSolvent extraction studies of different diastereomers of modified diglycolamide ligands for An(III) and Ln(III) extraction
000909859 260__ $$c2022
000909859 3367_ $$033$$2EndNote$$aConference Paper
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000909859 520__ $$aSolvent extraction is currently the preferred technique for the separation of actinides (An) from fission products(FP), and especially lanthanides (Ln), as constituents of Spent Nuclear Fuel (SNF) or PUREX raffinate. A specialinterest is on the separation of Am from Cm, Ln and other FP by testing various ligands to upgrade the currentmethods. Diglycolamide (DGA) derivatives have shown promising results as extractants for trivalent Ln and An,such as, N,N,N’,N’-tetra-n-octyl diglycolamide (TODGA), which usually have a higher affinity for Cm(III) overAm(III). Wilden et al. [1] reported a change on Am(III) selectivity over Cm(III) with methyl substitutions withdifferent orientation in the backbone of Me2-TODGA. Here, we study the selectivity and affinity of relatedextractants (TODGA and N,N,N’,N’-tetra-n-decyl diglycolamide, TDDGA) with dipropyl and ethyl-methylsubstitutions in the molecule backbone, and their respective diastereomers (syn or anti) in n-dodecane. Thechemical structures are shown in Figure 1 An inverse selectivity is observed for Am(III) over Cm(III) and otherLn(III) at high nitric acid concentration (7 - 10 mol L-1 HNO3). The steric hindrance gives low distribution ratios(D < 1.5) for the trivalent metal ions at 0.1 mol L-1 ligand concentration, as shown in Figure 2. Besides trivalentions, Pu(IV) was also tested with the interest on the complexation behavior with tetravalent ions, which showsremarkably higher distribution ratios at the same HNO3 concentrations (D > 10). This is unlike methyl anddimethyl-TODGA, which present similar distribution ratios between trivalent and tetravalent metal ions. The synethyl-methyl substitutions for both analogues showed the highest D values for Am(III) among the tested ligands,giving a promising molecule for further studies. The results of the extraction studies will be presented anddiscussed in the poster.References1. Wilden, A., et al., Unprecedented Inversion of Selectivity and Extraordinary Difference in theComplexation of Trivalent f-Elements by Diastereomers of a Methylated Diglycolamide. Chem. Eur. J.,2019. 25(21): p. 5507-5513.
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000909859 536__ $$0G:(BMWi)02E11921A$$aVerbundprojekt: Untersuchungen zur SEParation von AMericium aus hochradioaktiven Abfalllösungen (SEPAM), Teilprojekt A (02E11921A)$$c02E11921A$$x1
000909859 7001_ $$0P:(DE-Juel1)130438$$aWilden, Andreas$$b1$$ufzj
000909859 7001_ $$0P:(DE-Juel1)130383$$aModolo, Giuseppe$$b2$$ufzj
000909859 7001_ $$0P:(DE-HGF)0$$aGullo, M. C.$$b3
000909859 7001_ $$0P:(DE-HGF)0$$aVerboom, Willem$$b4
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000909859 9141_ $$y2022
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