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http://dx.doi.org/10.7733/jnfcwt.2020.18.4.457

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

Kim, Ik-Soo (Korea Atomic Energy Research Institute)
Chung, Dong-Yong (Korea Atomic Energy Research Institute)
Lee, Keun-Young (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.18, no.4, 2020 , pp. 457-464 More about this Journal
Abstract
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.
Keywords
Extraction; Uranium; TBP; Ionic liquid;
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