Electrochemistry of soluble UO2
2+ from the direct dissolution of UO2CO3 in acidic ionic liquid containing water
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Publication Details
Output type: Journal article
Author list: Pemberton W., Droessler J., Kinyanjui J., Czerwinski K., Hatchett D.
Publisher: Elsevier
Publication year: 2013
Journal: Electrochimica Acta (0013-4686)
Volume number: 93
Start page: 264
End page: 271
Number of pages: 8
ISSN: 0013-4686
URL: http://api.elsevier.com/content/abstract/scopus_id:84874825877
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Open access status: closed
Abstract
The direct dissolution of UOCO in neat and "wet" ionic liquid (IL) trimethyl-n-butylammonium bis(trifluoromethansulfonyl)imide [MeNBu][TFSI] is examined. The ionic liquid serves as both the solvent for the direct dissolution of UOCO(s) and the electrolyte solution for the electrochemical analysis of the soluble uranyl species. The solubility data indicate that displacement of the CO
occurs slowly due to the low concentration of protons available from residual water in the pristine IL. Enhanced dissolution of UOCO through the formation of carbonic acid HCO is achieved after the addition of acid, bis(trifluoromethanesulfonyl)amide (HTFSI) and water. The soluble uranyl cation can then coordinate with the TFSI anion in place of the displaced CO
anion following the decomposition of carbonic acid and purging of CO(g) and water from the IL. The solubility of UOCO was examined using liquid scintillation counting of U for the pristine ionic liquid. The "wet" ionic liquid containing HTFSI and soluble UOCO was evaluated using UV/vis spectroscopy before and after dissolution. The electrochemical deposition of uranium species from ionic liquid was evaluated using cyclic voltammetry. The potential mediated deposition of uranium species was achieved and verified using scanning electron microscopy (SEM) and the solid uranium deposits were evaluated using energy dispersive X-ray emission spectroscopy (EDX). © 2013 Elsevier Ltd. © 2013 Elsevier Ltd. All rights reserved.
Keywords
Deposition, Dissolution, Ionic liquid, Uranyl
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