Extraction of americium(VI) by a neutral phosphonate ligand

Martin, Leigh R.; Mincher, Bruce J.; Schmitt, Nicholas C.

doi:10.1007/s10967-009-0153-0

Cited by 28 publications

(24 citation statements)

References 13 publications

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“…It appears that the nitrate salting effect dominates at lower acidity and coextraction of nitric acid is responsible for the decrease of Eu(III) extraction beyond 2 M. The extraction capabilities of DBPrP and DBPeP are distinctly larger as compared to TBP even in the case of trivalent metal ions as shown in Figure 7. Studies proposed by Martin et al [31] have shown the efficient method of Am/Cm and Am/Ln separation using dibutylbutyl phosphonate. Am(III) was oxidised to Am(VI) using sodium bismuthate and it was observed that dibutylbutyl phosphonate is a better alternative than TBP, which can be used for the separation of Am/Cm and Am/Ln.…”

Section: Extraction Studies Of Eu(iii)mentioning

confidence: 99%

Phosphonates as alternative to tributyl phosphate for the separation of actinides from fission products

Vyas¹,

Rao²,

Jayalakshmi³

et al. 2014

Radiochimica Acta

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The present work investigates the role of increase in the basicity of organophosphorus extractant (dialkylalkyl phosphonates) on the uptake of actinides and fission products vis-à-vis tributyl phosphate (TBP), currently employed as a universal extractant. Two dialkylalkyl phosphonates viz. dibutylpropyl phosphonate (DBPrP) and dibutylpentyl phosphonate (DBPeP) were synthesized, characterized and evaluated for their solvent extraction behavior towards U(VI), Th(IV), Eu(III) and Tc(VII) in nitric acid medium ranging from 0.01-6 M. It was observed that increasing the basicity of the phosphoryl oxygen enhanced the uptake of the actinides and the distribution coefficient values were significantly larger as compared to TBP. The limiting organic concentration (LOC) value was estimated for Th(IV) for these extractants and compared with the TBP system. The separation factors of actinides with phosphonates over Tc(VII) are distinctly better than that with TBP.

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Section: Extraction Studies Of Eu(iii)mentioning

confidence: 99%

Phosphonates as alternative to tributyl phosphate for the separation of actinides from fission products

Vyas¹,

Rao²,

Jayalakshmi³

et al. 2014

Radiochimica Acta

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“…One approach to this problem is to oxidize Am(III) to Am(VI) and extract the americium from the lanthanides [2,3,4]. Of several oxidants that have been investigated, only sodium bismuthate has been used successfully for solvent extraction experiments [5]. Several ligands have been evaluated for Am(VI) extraction including conventional tributylphosphate (TBP) [6], its more basic analogues dibutylbutylphosphonate (DBBP) [5] and diamylamylphosphonate (DAAP) [7].…”

Section: Introductionmentioning

confidence: 99%

“…Of several oxidants that have been investigated, only sodium bismuthate has been used successfully for solvent extraction experiments [5]. Several ligands have been evaluated for Am(VI) extraction including conventional tributylphosphate (TBP) [6], its more basic analogues dibutylbutylphosphonate (DBBP) [5] and diamylamylphosphonate (DAAP) [7]. Prior development efforts have resulted in the demonstration of the extraction of Am(VI) in engineering-scale centrifugal contactors using DAAP [8].…”

Section: Introductionmentioning

confidence: 99%

Oxidation and extraction of Am(VI) using a monoamidic extractant in 3D printed centrifugal contactors

Law

Mincher

Tillotson

et al. 2018

J Radioanal Nucl Chem

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A series of tests were performed using centrifugal contactors to evaluate the separation of Am(VI) from cerium, as well as to determine the efficiency of the contactors. All experiments were performed using 2-cm, acrylic 3D-printed centrifugal contactors.Solvent extraction tests were performed using 1 M N,N-di(2-ethylhexyl)butyramide (DEHBA)/dodecane and a nitric acid feed solution spiked with 243 Am and 139 Ce and oxidized with 60 mg mL -1 sodium bismuthate. Approximately 72 % of the Am was extracted with a single contactor stage. Co-stripping of Am and Ce was demonstrated but attempts at selective stripping were not successful. Successful recycle of the used organic phase was demonstrated. Contactor efficiencies of 95 % to 100 % were obtained.

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“…Americium(VI) can be separated from curium(III) by Am(VI) extraction with bis(2,6-dimethyl-4-heptyl)phosphoric acid (HD(DIBM)P) [27,28], tributyl phosphate (TBP) [29,30], or dibutyl butyl phosphonate (DBBT) [31]. On the other hand, Am(V) is not extracted under the conditions when Cm(III) is, for example by 2-thenoyltrifluoroacetone (TTA) [32] or its synergistic mixture with tri-noctylphosphine oxide (TOPO) [33].…”

Section: Introductionmentioning

confidence: 99%

Separation of curium from americium using composite sorbents and complexing agent solutions

Šťastná

John

Šebesta

et al. 2014

J Radioanal Nucl Chem

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The EXAm and the AmSel liquid-liquid extraction processes have been used as bases for the development of chromatographic systems for separation of curium(III) from americium(III). The liquid organic phases were replaced by composite sorbents with PAN binding matrix and complexing agent in nitric acid solutions were employed as aqueous phases. The influence of complexing agent and nitric acid concentrations on weight distribution coefficients and separation factor and the kinetics of the actinide uptake were determined in batch experiments with trace amounts of 241 Am and 244 Cm. The efficiency of Cm(III) separation from Am(III) was evaluated in column experiment.

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Extraction of americium(VI) by a neutral phosphonate ligand

Cited by 28 publications

References 13 publications

Phosphonates as alternative to tributyl phosphate for the separation of actinides from fission products

Phosphonates as alternative to tributyl phosphate for the separation of actinides from fission products

Oxidation and extraction of Am(VI) using a monoamidic extractant in 3D printed centrifugal contactors

Separation of curium from americium using composite sorbents and complexing agent solutions

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