Anion concentration-dependent partitioning mechanism in the extraction of uranium into room-temperature ionic liquids

Dietz, Mark L.; Stepinski, Dominique C.

doi:10.1016/j.talanta.2007.11.051

Cited by 200 publications

(141 citation statements)

References 46 publications

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“…The complex formation of UO 2 2+ with bet in low acidic solutions is supported by the fact that the [(UO 2 ) 2 (bet) 6 Table 1 and are plotted against [HNO 3 ] logarithmically in Figure 2. As seen from this figure, the [HNO 3 ] dependence of D is different from that in the extraction of U(VI) from aqueous HNO 3 solution to 30% tributyl phosphate/dodecane phase (TBP system), 39,44 where the U(VI) extraction occurs through the ionpair mechanism and the D values increase with an increase in [HNO 3 ]. This indicates that the present U(VI) extraction does not proceed by an ion-pair mechanism and also supports our complex formation mechanism.…”

mentioning

confidence: 90%

“…This indicates that the present U(VI) extraction does not proceed by an ion-pair mechanism and also supports our complex formation mechanism. In addition, the D values at low acidity ( Figure 2) are more than 1 and larger than that (D < 0.1) for the extraction of U(VI) in the TBP system under [HNO 3 ] < 0.1 M. 39,44 This suggests that [Hbet][Tf 2 N] itself is an effective medium for the extraction of U(VI) species under the low acidic condition. This suggests that at low HNO 3 concentration the U(VI) species are separated selectively from Na(I) and Al(III) species.…”

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confidence: 93%

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Selective Liquid–Liquid Extraction of Uranyl Species Using Task-specific Ionic Liquid, Betainium Bis(trifluoromethylsulfonyl)imide

Sasaki¹,

Suzuki

Mori

et al. 2014

Chemistry Letters

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Extraction behavior of U(VI) species from aqueous HNO 3 solution to [Hbet][Tf 2 N] or [TMPA][Tf 2 N] phase (Hbet: betainium, TMPA: N,N,N-trimethyl-N-propylammonium, Tf 2 N: bis(trifluoromethylsulfonyl)imide) has been studied. It was found that the extractability (E) is 62% in the extraction from 0.01 M HNO 3 to [Hbet][Tf 2 N] and decreases with an increase in [HNO 3 ] and that the U(VI) species are not extracted into [TMPA][Tf 2 N] phase. These results suggest that the extraction of U(VI) species is due to the complex formation of UO 2 2+ with the COO ¹ group of deprotonated betaine (bet). Furthermore, other metal species such as Na(I) and Al(III) in 0.01 M HNO 3 solution were found to be hardly extracted.Recently, functionalized ionic liquids (ILs), so-called taskspecific ILs (TSILs), which incorporate functional groups designed to impart to them particular properties or reactivity, have been synthesized and applied in various fields.19 In the nuclear industry, ILs and TSILs are expected to be used as media for radioactive waste treatment and the reprocessing of spent nuclear fuels, i.e., as alternative media to organic solvents for liquidliquid extraction and to molten salts for pyro-reprocessing processes. Hence, the dissolution properties of uranium oxides (UO 2 and U 3 O 8 ) into ILs, the extraction behavior of uranyl species from aqueous solutions to IL or TSIL phases, electrochemical properties of uranyl species in ILs, and properties of some other actinoid species in ILs have been studied extensively. 1027We have also studied dissolution behavior of uranium oxides (UO 2 and U 3 O 8 ) and electrochemical properties of uranyl species in BMI (1-butyl-3-methylimidazolium)- In order to develop the above processes, it is necessary to confirm as a basic matter whether the U(VI) species can be selectively extracted to the [Hbet][Tf 2 N] phase without adding any extractant. There are many reports related to the extraction of U(VI) species using ILs. However, most of them have proposed methods requiring extractants in the IL phases for the selective extraction of U(VI). 3644In this study, we examined the extraction behavior of U(VI) species from aqueous HNO 3 solutions to [Hbet] Similarly, the extraction behavior of Na(I) and Al(III), which are main components of NaF and Al 2 O 3 adsorbents, was also examined.Dried

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confidence: 90%

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confidence: 93%

Selective Liquid–Liquid Extraction of Uranyl Species Using Task-specific Ionic Liquid, Betainium Bis(trifluoromethylsulfonyl)imide

Sasaki¹,

Suzuki

Mori

et al. 2014

Chemistry Letters

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“…Hydrophobic ILs incorporating functional groups such as urea, disulfide, phosphoryl, hydroxylbenzylamine, salicylaldehyde groups etc., task-specific ILs, have been developed and used for the extraction of metal ions [60][61][62][63][64][65][66]. task-specific ILs have been prepared by introducing a functional group to the IL cations, almost always imidazolium cations, however, new ILs are based on ammonium cations with carboxylate and phosphonate anions, namely bi-functional IL extractants (bif-ILE) because the ILs are now pairs of two extractant molecules.…”

Section: Task-specific Ionic Liquidsmentioning

confidence: 99%

Application of Ionic Liquids for the Separation of Rare Earth Metals

Kubota

Baba

Goto

2012

SERDJ

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Liquid-liquid extraction is one of the most important techniques for the separation of rare earth metals in hydrometallurgy. Recently, ionic liquids (ILs) have attracted much attention as green alternatives to conventional organic solvents. Due to the additional advantage of good radiation stability, their application to the separation of fission products in nuclear fuel reprocessing has been promoted. In this article, we summarize the IL-based extraction of rare earth metals and advanced techniques are described.

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“…This organic extractant has very high affinity towards uranium, plutonium, thorium, zirconium, and so forth and hence is used frequently for their separation as well as purification. [15][16][17] The high affinity of TBP towards uranium is due to presence of P═O bond in it, which forms complex with uranyl ion (UO 2…”

Section: Introductionmentioning

confidence: 99%

Improved approach for the determination of low‐Z elements in uranium samples using a vacuum chamber TXRF spectrometer

2017

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Total reflection X-ray fluorescence (TXRF) method for the determination of low atomic number (Z) elements Na (Z = 11) to Ca (Z = 20) using Cr Kα excitation, vacuum atmosphere sample chamber, and ultrathin window detector of a low Z-high Z TXRF spectrometer has been developed. The earlier reported problem in determination of Al, due to interference of U Mα escape peak with Al Kα, was taken care by more intense solvent extraction-based separation of uranium matrix from the sample solutions. Any dissolved tri-n-butyl phosphate having traces of uranium left after solvent extraction was removed from the sample solutions by equilibrating with n-dodecane. This approach resulted in the betterment of analytical results. The method developed was validated by analyzing three Certified Reference Materials for trace metals in uranium oxide, developed by Department of Atomic Energy, Government of India. The TXRF determined results were found to have an average precision of 8.0% (1σ, n = 3) and the average deviation of the TXRF determined values from the certified concentrations was 7.3%.

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Anion concentration-dependent partitioning mechanism in the extraction of uranium into room-temperature ionic liquids

Cited by 200 publications

References 46 publications

Selective Liquid–Liquid Extraction of Uranyl Species Using Task-specific Ionic Liquid, Betainium Bis(trifluoromethylsulfonyl)imide

Selective Liquid–Liquid Extraction of Uranyl Species Using Task-specific Ionic Liquid, Betainium Bis(trifluoromethylsulfonyl)imide

Application of Ionic Liquids for the Separation of Rare Earth Metals

Improved approach for the determination of low‐Z elements in uranium samples using a vacuum chamber TXRF spectrometer

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