TS-BTPhen as a promising hydrophilic complexing agent for selective Am(III) separation by solvent extraction

Kaufholz, Peter, Sadowski, Fabian, Wilden, Andreas, Modolo, Giuseppe, Lewis, Frank, Smith, Andrew W. and Harwood, Laurence (2015) TS-BTPhen as a promising hydrophilic complexing agent for selective Am(III) separation by solvent extraction. Nukleonika, 60 (4). ISSN 0029-5922

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Official URL: http://dx.doi.org/10.1515/nuka-2015-0120

Abstract

The novel hydrophilic back-extraction agent TS-BTPhen (3,3ʹ,3ʺ,3ʹʺ-[3-(1,10-phenanthroline-2,9-diyl)-1,2,4-triazine-5,5,6,6-tetrayl]tetrabenzenesulfonic acid) was tested for its selectivity towards Am(III) over Cm(III) and Eu(III) with a TODGA (N,N,Nʹ,Nʹ-tetraoctyldiglycolamide) based solvent. Batch experiments were carried out using TS-BTPhen dissolved in aqueous nitric acid solution with tracers of 152Eu, 241Am and 244Cm. A significant increase of the separation factor for Cm over Am from SFCm/Am = 1.6 up to SFCm/Am = 3.3 was observed compared to the use of a TODGA-nitric acid system alone. Furthermore, stripping was possible at high nitric acid concentrations (0.6-0.7 mol/L) resulting in a low sensitivity to acidity changes. The influence of the TS-BTPhen concentration was analyzed. A slope of -2 was expected taking into account literature stoichiometries of the lipophilic analogue CyMe4BTPhen. However, a slope of -1 was found. Batch stripping kinetics showed fast kinetics for the trivalent actinides. As an alternative organic ligand the methylated TODGA derivate Me-TODGA (2-methyl-N,N,Nʹ,Nʹ-tetraoctyldiglycolamide) was tested in combination with the hydrophilic TS-BTPhen. The Am(III) separation was achieved at even higher nitric acid concentrations compared to TODGA.

Item Type: Article
Uncontrolled Keywords: Am-Cm separation; TODGA; TS-BTPhen; liquid-liquid extraction
Subjects: F100 Chemistry
Department: Faculties > Health and Life Sciences > School of Life Sciences > Applied Sciences
Depositing User: Paul Burns
Date Deposited: 24 Feb 2016 12:39
Last Modified: 14 May 2017 02:05
URI: http://nrl.northumbria.ac.uk/id/eprint/26155

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