Extraction Behavior of Uranyl Ion From Nitric Acid Medium by TBP Extractant in Ionic Liquid

In this study, extraction of uranium(VI) from an aqueous nitric acid solution was investigated using tri-n-butyl phosphate (TBP) as an extractant in an ionic liquid, 1-alkyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([Cnmim][Tf2N]). The distribution ratio of U(VI) in 1.1 M TBP/[Cnmim][T...

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Bibliographic Details
Published in:Journal of nuclear fuel cycle and waste technology (Online) 2020, 18(4), , pp.457-464
Main Authors: Kim, Ik-Soo, Chung, Dong-Yong, Lee, Keun-Young
Format: Article
Language:English
Subjects:
원자력공학
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Summary:In this study, extraction of uranium(VI) from an aqueous nitric acid solution was investigated using tri-n-butyl phosphate (TBP) as an extractant in an ionic liquid, 1-alkyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([Cnmim][Tf2N]). The distribution ratio of U(VI) in 1.1 M TBP/[Cnmim][Tf2N] was significantly high when the concentration of nitric acid was low. The value of the distribution ratio decreased as the concentration of the nitric acid increased at lower acidities, and then increased with a nitric acid concentration of up to 8 M. This can be attributed to the different extraction mechanisms of U(VI) based on nitric acid concentrations. Thus, a cation exchange at low acidity levels and an ion-pair extraction at high acidity levels were suggested as the extraction mechanism of U(VI) in the TBP/[Cnmim][Tf2N] system. KCI Citation Count: 0
ISSN:1738-1894
2288-5471
DOI:10.7733/jnfcwt.2020.18.4.457