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Fundamental An(iii)-Ln(III) separation chemistry of N-donor ligands

Geist, Andreas

Abstract:
For three decades lipophilic N-donor extracting agents have been used to separate trivalent actinides from the chemically similar lanthanide ions in the context of advanced nuclear fuel cycles. 15 years ago, bis-triazinyl-pyridines (BTP) were shown to achieve this separation under conditions relevant to the reprocessing of nuclear fuels, i.e. from nitric acid solutions. BTP were later followed by the bis-triazinyl-bipyridines (BTBP). More recently, water soluble BT(B)P were used as complexing agents selective for actinides. These could be useful for simplified process schemes. Despite BT(B)P’s advantageous properties, current work in international projects is directed towards finding ligands with even better properties. This requires a deep understanding of how such ligands work on the molecular level. This question has been addressed in several studies, the outcome of which has recently been summarised. The following conclusions are drawn: Only N-­‐donor ligands forming strong complexes with actinides(III) show adequate performance in highly acidic solutions. Furthermore, high selectivity over lanthanides(III) seems to correlate wi ... mehr


Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Vortrag
Jahr 2015
Sprache Englisch
Identifikator KITopen ID: 230100674
HGF-Programm 32.01.11; LK 01
Erschienen in 10th International Conference on Methods and Applications of Radioanalytical Chemistry (MARC X), Kailua-Kona, Hawaii, April 12-17, 2015
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