Spectroscopic studies on uranyl complexes with tri-n-butyl phosphate (TBP) in ionic liquids

Wang, Yue; Liu, Yupeng; Chu, Taiwei

doi:10.1007/s10967-015-4608-1

Cited by 8 publications

(8 citation statements)

References 44 publications

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“…The FTIR studies served as a versatile tool for the understanding of the metal–ligand interaction under a variety of chemical conditions. , In the present studies also, the FTIR studies were carried out to understand the interaction between the uranyl ion and the HD2EHP ligand and also to get more information about the upper and lower phases resulting from the phase splitting. The FTIR spectra of neat HD2EHP, C 8 mim·NTf 2 , and 0.4 M HD2EHP-C 8 mim·NTf 2 (Figure S1, Supporting Information) along with the upper and lower phases (Figure a) were recorded for comparison purpose.…”

Section: Resultsmentioning

confidence: 99%

In Situ Preconcentration during the Di-(2-ethylhexyl) Phosphoric Acid-Assisted Dissolution of Uranium Trioxide in an Ionic Liquid: Spectroscopic, Electrochemical, and Theoretical Studies

et al. 2021

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Dissolution of uranium oxide was carried out using a solution of HD2EHP in C 8 mim•NTf 2 , which was apparently facilitated by the in situ generation of water during the complex formation reaction. The dissolved complex in the ionic liquid phase led to splitting of the latter into a light phase and a heavy phase where the former contained predominantly the UO 2 (HL 2 ) 2 complex (HL = HD2EHP), while the latter contained the ionic liquid as supported by FTIR and UV−Visible spectral analyses. The complexation of the uranyl ion was suggested to take place in the equatorial plane where two dimeric units of the H-bonded HD2EHP molecules took part in complexation. An increase in temperature facilitated the dissolution rate with an activation energy of 31.0 ± 2.8 kJ/mol. The cyclic voltammetry studies indicated potential chances of recovery of the dissolved uranium by electrodeposition at the cathode. The proposed dimeric structure of HD2EHP in the complexation with U(VI) was supported by DFT studies also.

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Section: Resultsmentioning

confidence: 99%

In Situ Preconcentration during the Di-(2-ethylhexyl) Phosphoric Acid-Assisted Dissolution of Uranium Trioxide in an Ionic Liquid: Spectroscopic, Electrochemical, and Theoretical Studies

et al. 2021

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“…In fact, this kind of background correction was possible due to the availability of ATR in FTIR‐spectrometer. Several authors have reported such differential spectrums when the FTIR spectrum of the sample was masked by the solvent . Figure shows the differential ATR‐FTIR spectrum of UO 2 (NO 3 ) 2 in C 4 mimNTf 2 .…”

Section: Resultsmentioning

confidence: 96%

“…The ligand TBP exhibits a strong P=O stretching transmittance bands at ∼1280 cm −1 . The literature shows that co‐ordination of uranyl nitrate with TBP results in the shift of P=O stretching bands from 1280 cm −1 (uncoordinated P=O) to 1170 cm −1 (coordinated P=O).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Behavior of U(VI) in Imidazolium Ionic Liquid Medium Containing Tri‐n‐butyl Phosphate and Chloride Ion and Spectroscopic Characterization of Uranyl Species

et al. 2017

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The electrochemical behaviour of UO2(NO3)2in a solution of tri‐n‐butyl phosphate (TBP) present in 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide (C4mimNTf2) ionic liquid was studied in the presence of chloride ion, to understand the decomplexation behaviour of uranyl ion (UO22+)from TBP coordination, and to examine the possibility of underpotential reduction of UO22+. The mole ratio of U : NO3 : TBP : Cl in ionic liquid solution was varied from 1 : 2 : 2 : 0to 1 : 2 : 2 : 6 in the study. The cyclic voltammogram of UO2(NO3)2 present in TBP/C4mimNTf2, was compared with the voltammograms obtained in the presence of 1‐butyl‐3‐methylimidazolium chloride (C4mimCl). The current density of UO22+ reduction increased with increase in the chloride content of ionic liquid phase, which was attributed to the formation of chloro complexes of uranium (VI), and these chloro complexes were found to undergo facile and favourable reduction at the working electrode. The diffusion coefficient of uranylspecies was determined at various concentrations of chloride ion and the nature of uranylspecies diffusing at the working electrode at various mole ratios of U : NO3 : TBP : Cl was characterized by UV–Visible, ATR‐FTIR and Raman spectroscopy.

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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%

“…Tri‐n‐butyl phosphate (TBP) was used as the extracting agent for uranium in above studies. 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 . 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 2+ ) when it comes in contact with uranyl solution in proper acidic medium.…”

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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Spectroscopic studies on uranyl complexes with tri-n-butyl phosphate (TBP) in ionic liquids

Cited by 8 publications

References 44 publications

In Situ Preconcentration during the Di-(2-ethylhexyl) Phosphoric Acid-Assisted Dissolution of Uranium Trioxide in an Ionic Liquid: Spectroscopic, Electrochemical, and Theoretical Studies

In Situ Preconcentration during the Di-(2-ethylhexyl) Phosphoric Acid-Assisted Dissolution of Uranium Trioxide in an Ionic Liquid: Spectroscopic, Electrochemical, and Theoretical Studies

Electrochemical Behavior of U(VI) in Imidazolium Ionic Liquid Medium Containing Tri‐n‐butyl Phosphate and Chloride Ion and Spectroscopic Characterization of Uranyl Species

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

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