The separation of americium(III) from europium(III) by two new 6,6’-bistriazinyl-2,2’-bipyridines in different diluents

Harwood, Laurence, Lewis, Frank, Hudson, Michael, John, Jan and Distler, Petr (2011) The separation of americium(III) from europium(III) by two new 6,6’-bistriazinyl-2,2’-bipyridines in different diluents. Solvent Extraction and Ion Exchange, 29. pp. 551-576. ISSN 0736-6299

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Cy5-O_AND_S-Me4-BTBP_PAPER_REVISED.pdf - Accepted Version

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Official URL: http://dx.doi.org/10.1080/10496475.2011.556989

Abstract

The synthesis and extraction of americium(III) and europium(III) from aqueous nitric acid solutions by the new BTBP ligands 6,6’-bis(5,5,7,7-tetramethyl-5,7-dihydrofuro[3,4-e]-1,2,4-triazin-3-yl)-2,2’-bipyridine (Cy5-O-Me4-BTBP) and 6,6’-bis(5,5,7,7-tetramethyl-5,7-dihydrothieno[3,4-e]-1,2,4-triazin-3-yl)-2,2’-bipyridine (Cy5-S-Me4-BTBP) is described. The affinity for Am(III) and the selectivity for Am(III) over Eu(III) of Cy5-S-Me4-BTBP were generally higher than for Cy5-O-Me4-BTBP. For both ligands, the extraction of Am(III) and Eu(III) from 3 M HNO3 into 3 mM organic solutions varied with the diluent used. The highest distribution ratios and separation factors observed were in cyclohexanone and 2-methylcyclohexanone, respectively. For Cy5-S-Me4-BTBP, there is a strong correlation between the distribution ratio for Am(III) and the permittivity of the diluent used. With 1-octanol as the diluent, low distribution ratios (D(Am) < 1) were observed for Cy5-S-Me4-BTBP although this ligand extracts Am(III) selectively (SFAm/Eu = 16-46 from 1-4 M HNO3). For Cy5-S-Me4-BTBP, Am(III) is extracted as the disolvate. The distribution ratios for Am(III), and the separation factors for Am(III) over Eu(III) are both significantly higher for CyMe4-BTBP than they are for Cy5-O-Me4-BTBP and Cy5-S-Me4-BTBP in cyclohexanone. Changing the diluent from cyclohexanone to 2-methylcyclohexanone leads to a decrease in D(Am) but an increase in SFAm/Eu for Cy5-S-Me4-BTBP.

Item Type: Article
Additional Information: This is an Author's Accepted Manuscript of an article published in the Solvent Extraction and Ion Exchange [18 July 2011] [copyright Taylor & Francis], available online at: http://www.tandfonline.com/10.1080/10496475.2011.556989
Uncontrolled Keywords: Americium(III), europium(III), separation, nitric acid, 1-octanol, kinetics, Cy5-O-Me4-BTBP, SANEX process, Cy5-S-Me4-BTBP, cyclohexanone, 2-methylcyclohexanone, CyMe4-BTBP, extraction
Subjects: F100 Chemistry
Department: Faculties > Health and Life Sciences > School of Life Sciences > Applied Sciences
Depositing User: Frank Lewis
Date Deposited: 02 Jan 2013 09:53
Last Modified: 10 May 2017 17:09
URI: http://nrl.northumbria.ac.uk/id/eprint/10879

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