2021
DOI: 10.1080/07366299.2021.1876993
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Separation of uranium(VI) and americium(III) by Extraction from Na2CO3–H2O2 solutions using methyltrioctylammonium carbonate in toluene

Abstract: Electronic Supporting Information (ESI) Тechnical data XRD patterns of UO4•4H2O (a) and Na4[UO2(CO3)3] (b) powders, used for aqueous carbonate solution preparation.

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Cited by 5 publications
(10 citation statements)
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“…Subsequently, the aqueous phase was isolated. The concentration of U(VI) in the aqueous phase was determined by the spectrophotometric method (Evolution 220, Thermo Scientific) with Arsenazo III. , The uranium concentration in the organic phase is determined using the subtraction method, and thus, the extraction distribution ratio can be expressed by eq D = c U 0 c U c U × A A = V aq V or where c U 0 (mol/L) represents the concentration of uranium in the aqueous phase before extraction, c U (mol/L) represents the concentration of uranium in the aqueous phase after reaching extraction equilibrium, and V aq and V or (mL) represent the volume of the aqueous phase and organic phase, respectively. A represents the phase volume ratio, and we define phase volume ratio A as the ratio of the volume of the aqueous phase to the volume of the organic phase, as shown in eq .…”
Section: Methodsmentioning
confidence: 99%
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“…Subsequently, the aqueous phase was isolated. The concentration of U(VI) in the aqueous phase was determined by the spectrophotometric method (Evolution 220, Thermo Scientific) with Arsenazo III. , The uranium concentration in the organic phase is determined using the subtraction method, and thus, the extraction distribution ratio can be expressed by eq D = c U 0 c U c U × A A = V aq V or where c U 0 (mol/L) represents the concentration of uranium in the aqueous phase before extraction, c U (mol/L) represents the concentration of uranium in the aqueous phase after reaching extraction equilibrium, and V aq and V or (mL) represent the volume of the aqueous phase and organic phase, respectively. A represents the phase volume ratio, and we define phase volume ratio A as the ratio of the volume of the aqueous phase to the volume of the organic phase, as shown in eq .…”
Section: Methodsmentioning
confidence: 99%
“…It can be inferred that uranyl may exist in the organic phase in three distinct forms: (R 4 N) 4 [UO 2 (CO 3 ) 3 ], (R 4 N) 4 [UO 2 (O 2 )(CO 3 ) 2 ], and (R 4 N) 6 [(UO 2 ) 2 (O 2 )(CO 3 ) 4 ]. A. V. Boyarintsev et al investigated the extraction of U and Am by MTOAC, resulting in the reaction equation for the extraction of Na 4 [UO 2 (CO 3 ) 3 ] and Na 4 [UO 2 (O 2 )(CO 3 ) 2 ], as shown in eq and eq . 2 false( normalR 4 normalN false) 2 CO 3 + Na 4 [ UO 2 ( CO 3 ) 3 ] false( normalR 4 normalN false) 4 [ UO 2 ( CO 3 ) 3 ] + 2 Na 2 CO 3 2 false( normalR 4 normalN false) 2 CO 3 + Na 4 [ UO 2 false( normalO 2 false) ( CO 3 ) 2 ] <...…”
Section: Introductionmentioning
confidence: 99%
“…where x = 1 or 2. In Na2CO3-H2O2 aqueous solutions, the formation of polynuclear species of U(VI): [(UO2)2(O2)(CO3)4] 6or [(UO2)3(O2)2(CO3)4] 6can also occur [12]- [14].…”
Section: Methodsmentioning
confidence: 99%
“…Solvent extraction of U(VI) was carried out using 0.5 mol/L solution of MTOA carbonate in toluene. MTOA carbonate from carbonate solutions can be described by following chemical equations [12]- [14]:…”
Section: Methodsmentioning
confidence: 99%
“…Although there are many examples on rare earth separation, [24][25][26][27][28][29][30] there are only a few examples of separation processes in general using carbonate medium. These examples consist of extraction of lanthanides and transplutonium elements from alkaline and carbonate media can be achieved mainly via liquid-liquid extraction, [31][32][33][34][35][36] using various extractants such as quaternary ammonium salts, [37][38][39] primary amines 40 or alkylpyrocatechols. 41 There are also just a few examples of using extraction chromatography in carbonate media.…”
Section: Introductionmentioning
confidence: 99%