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| Hauptseite > Publikationsdatenbank > Synthesis and evaluation of novel water-soluble ligands for the complexation of metals during the partitioning of actinides |
| Hauptseite > Publikationsdatenbank > Synthesis and evaluation of novel water-soluble ligands for the complexation of metals during the partitioning of actinides |
| Journal Article | PreJuSER-17077 |
; ; ; ;
2011
RSC
London
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Please use a persistent id in citations: http://hdl.handle.net/2128/7338 doi:10.1039/C1NJ20523D
Abstract: Different types of water-soluble ligands were synthesized and their capability was evaluated by solvent extraction studies to complex trivalent actinides and suppress their extraction by a strong lipophilic ligand, such as TODGA. The back extraction efficiency of hydrophilic diglycolamide (DGA) derivatives with a varying number of ethylene glycol groups, or containing sodium acetate moieties on the amidic nitrogen shows a decrease in back-extraction efficiency with increasing number of ethylene glycol units on the amidic nitrogen at various pH values of the aqueous phase. Among the P-S donating ligands only the ligand with a malonamide backbone exhibits a high reverse extraction efficiency, although, with no selectivity for americium. Within the water-soluble tripodal ligands, i.e. the amide derivatives of nitrilotriacid with N,N-dimethyl and N, N-bis(hydroxyethyl) moieties, the first one shows a pronounced selectivity for Am(III) over Eu(III), with a maximum separation factor of 11.1, while the latter one more efficiently complexes the radionuclides in the aqueous phase with a maximum separation factor of 5. Isothermal microcalorimetry experiments of the complexation of Eu(III) by a selected series of ligands confirm the observed trend in the back extraction properties.
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