Synergic extraction of actinides

Ramakrishna, V.; Patil, S. K.

doi:10.1007/bfb0111654

Cited by 25 publications

(11 citation statements)

References 172 publications

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“…well established [18]. Both HDEHP and TBP are proposed to participate in the extraction of uranium(VI) at all acidities [29]. However, the contribution of HDEHP is predominant at lower acidity and that of TBP at higher acidity.…”

Section: Extraction Of U(vi) In Hdehp and [A336] + [No 3 ] −mentioning

confidence: 99%

Insights into the extraction behavior of U(VI) in Aliquat-336 based ionic liquids

et al. 2014

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The extraction behavior of U(VI) in the PUREX solvent namely 1.1 M tri--butyl phosphate (TBP) indodecane ( -DD) was studied in the presence and absence of the ionic liquid, tri--octylmethylammonium bis-(2-ethylhexyl)phosphate ([A336] + [DEHP] − ). The discrepancy in the extraction behavior observed in these systems was probed by measuring the distribution ratio of U(VI) as a function of various parameters. The distribution ratio of U(VI) in 0.03 M [A336] + [DEHP] − / -DD decreased with increase in the concentration of nitric acid. The extraction of U(VI) was accompanied by the extraction of nitric acid leading to the formation of ionic liquid constituents namely tri--octylmethylammonium nitrate ([A336] + [NO 3 ] − and bis(2-ethylhexyl)phosphoricacid (HDEHP). Therefore, the distribution ratio of U(VI) in the PUREX solvent was measured in the presence of these constituents also. The study revealed that extraction of U(VI) was controlled essentially by the synergistic contribution of TBP and the constituents of ionic liquid.

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Section: Extraction Of U(vi) In Hdehp and [A336] + [No 3 ] −mentioning

confidence: 99%

Insights into the extraction behavior of U(VI) in Aliquat-336 based ionic liquids

et al. 2014

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“…On the other hand, the tetravalent actinide ions displaying common co-ordination number of 8 are normally extracted into the oganic phase as anhydrous chelates by beta-diketones. Therefore, relatively weaker synergism is observed with these ions [1] probably due to the little increase in their organophilicity.…”

Section: Introductionmentioning

confidence: 96%

“…Synergism in the extraction of actinides has been extensively investigated employing /J-diketones as the chelating extractants and several oxodonors as neutral adducts [1,2]. The synergistic enhancement is particularly large for the divalent and trivalent cations.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Plutonium(IV) with l-Phenyl-3-Methyl-4-Benzoyl Pyrazol-5-one and Tri-n-octylphosphine Oxide

Manchanda¹,

Mohapatra²

1993

Radiochimica Acta

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The synergistic extraction of plutonium(IV) with l-phenyl-3-methyl-4-benzoyl pyrazol-5-one (HPMBP) and tri-n-octylphosphine oxide (TOPO) has been investigated using toluene as the diluent and perchloric acid as the aqueous medium. Several species with the stoichiometry Pu(PMBP) 4 , Pu(PMBP) 4 · TOPO and PU(PMBP) 3 (C10 4 ) · 2TOPO are co-extracted into the organic phase. The relative proportion of these species depends on the Perchlorate concentration and on the concentration ratio of HPMBP to TOPO. The adduct formation constants for the ternary species for Pu 4+ are found to be smaller than those of UO| + and Am 3 + . Steric factors play a dominant role in the coordination of the neutral oxodonor.

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“…The synergistic extraction of thorium(IV) and uranium(VI) by mixtures of thenoyltrifluoroacetone (Htta) and neutral oxo-donors has been studied extensively by several authors and these data are covered in excellent reviews on synergistic extraction of actinides [1,2]. Mixed-ligand systems have also been used commercially for the recovery of uranium from phosphoric acid leach liquors using mixtures of di-2-ethylhexyl phosphoric acid and trioctylphosphine oxide [3].…”

Section: Introductionmentioning

confidence: 99%

Mixed-ligand chelate extraction of thorium(IV) and uranium(VI) with thenoyltrifluroacetone and various imidazoles

Reddy¹,

Ramamohan²,

Sahu³

et al. 2000

Radiochimica Acta

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Synergistic extraction / Thorium(IV) / Uranium (VI) / Htta / Heterocyclic N-donorsSummary. The synergistic extraction of thorium(IV) and uranium(VI) has been studied using mixtures of thenoyltrifluoroacetone (Htta) and various imidazoles such as imidazole (Imz), 2-methylimidazole (2-Meimz), benzimidazole (Bimz) or 2-pyridylbenzimidazole (2-Pybimz). The extraction data have been analysed by both graphical and theoretical methods by taking into account chemical mass action principles. The results demonstrate that these metal ions are extracted into chloroform as Th(tta) 4 and UO 2 (tta) 2 with Htta alone and as Th(tta) 4 · nS and UO 2 (tta) 2 · nS in the presence of imidazoles (where n ϭ 1 and 2 for thorium(IV) and n ϭ 1 for uranium(VI); S represents imidazole). The equilibrium constants of the above extracted complexes have been deduced by non-linear regression analysis. The addition of an imidazole to the metal chelate system enhances the extraction efficiency of these metal ions. The complexation strength of these metal ions with various imidazoles follows the order: Imz Ͼ 2-Meimz Ͼ Bimz Ͼ 2-Pybimz.

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Synergic extraction of actinides

Cited by 25 publications

References 172 publications

Insights into the extraction behavior of U(VI) in Aliquat-336 based ionic liquids

Insights into the extraction behavior of U(VI) in Aliquat-336 based ionic liquids

Extraction of Plutonium(IV) with l-Phenyl-3-Methyl-4-Benzoyl Pyrazol-5-one and Tri-n-octylphosphine Oxide

Mixed-ligand chelate extraction of thorium(IV) and uranium(VI) with thenoyltrifluroacetone and various imidazoles

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