Solvent Extraction With Organophosphonic Mono-Acidic Esters

Otu, Emmanuel O.; Westland, Alan D.

doi:10.1080/07366299008918029

Cited by 36 publications

(7 citation statements)

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“…5).The D Ln value at the given HNO 3 concentration grows in going from La to Lu (Fig. 3) with an increasing charge density on the Ln 3+ ion, in analogy with the trends observed for the solvent extraction system with D2EHPA [15]. The difference in D Ln values between Lu(III) and La(III) is fairly large (about 4.7 log units), showing the potential usefulness of the FB-D2EHPA sorbent as a stationary phase in the chromatographic system.…”

Section: Resultssupporting

confidence: 74%

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Adsorption of lanthanides(III) from aqueous solutions by fullerene black modified with di(2-ethylhexyl)phosphoric acid

Туранов

Karandashevb

2009

Open Chemistry

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Fullerene black (FB) -a product of electric arc graphite vaporization after extraction of fullerenes -was modified with the di(2-ethylhexyl)phosphoric acid (D2EHPA). The distribution of D2EHPA between FB and aqueous HNO 3 solutions has been studied. The effect of HNO 3 concentration in the aqueous phase and that of D2EHPA concentration in the sorbent phase on the adsorption of microquantities of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y nitrates from HNO 3 solutionsbyD2EHPA-modifiedFB areconsidered.Thestoichiometryofthesorbedcomplexeshasbeendeterminedbytheslopeanalysismethod.Theefficiencyof lanthanides' adsorption increases with an increase in the element atomic number. A considerable synergistic effect has been observed upon the addition of the neutral bidentate tetraphenylmethylenediphosphine dioxide ligand to D2EHPA in the sorbent phase.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Section: Resultssupporting

confidence: 74%

“…Therefore, the adsorption of the metal ion is accompanied by a release of free protons. Considering that the resulting Ln(III) complex may be solvated by nondissociated HA [15], the adsorption of lanthanide ions can be described by the following general expression:…”

Section: Resultsmentioning

confidence: 99%

Adsorption of lanthanides(III) from aqueous solutions by fullerene black modified with di(2-ethylhexyl)phosphoric acid

Туранов

Karandashevb

2009

Open Chemistry

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“…The extractant selected for study is the alkyl phosphoric acid known as HDEHP (Scheme a), which was originally designed to extract lanthanide(III) cations via a “cation exchange” mechanism . In biphasic liquid–liquid systems, extraction proceeds via deprotonation of the dimerized HDEHP extractant molecule (LH) 2 , where three monodeprotonated dimers are known to form the 6-coordinate oil-soluble complex with lanthanide(III) ions (L·LH) 3 Ln according to eq : − where LH stands for neutral HDEHP and L for deprotonated DEHP + , and the subscript “org” indicates organic soluble species.…”

Section: Resultsmentioning

confidence: 99%

Ion Transport Mechanisms in Liquid–Liquid Interface

et al. 2017

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Interfacial liquid-liquid ion transport is of crucial importance to biotechnology and industrial separation processes including nuclear elements and rare earths. A water-in-oil microemulsion is formulated here with density and dimensions amenable to atomistic molecular dynamics simulation, facilitating convergent theoretical and experimental approaches to elucidate interfacial ion transport mechanisms. Lutetium(III) cations are transported from the 5 nm diameter water pools into the surrounding oil using an extractant (a lipophilic ligand). Changes in ion coordination sphere and interactions between the interfacial components are studied using a combination of synchrotron X-ray scattering, spectroscopy, and atomistic molecular dynamics simulations. Contrary to existing hypotheses, our model system shows no evidence of interfacial extractant monolayers, but rather ions are exchanged through water channels that penetrate the surfactant monolayer and connect to the oil-based extractant. Our results highlight the dynamic nature of the oil-water interface and show that lipophilic ion shuttles need not form flat monolayer structures to facilitate ion transport across the liquid-liquid interface.

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“…The difference between acid V (containing no additional donor-active diphenylphosphoryl group), on the one hand, and acids II and III, on the other hand, increases in the same direction to a still greater extent. The increase in D Ln along the Ln series, noted for the extraction of Ln by the cation-exchange mechanism [16], is the most pronounced in the system with V. The Lu/La separation factor decreases in the order V > III > II > IV, with an increase in the solvation power of these compounds.…”

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confidence: 94%

Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions

2005

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Extraction of microamounts of U(VI), Th(IV), Sc(III), and Ln(III) from HNO 3 solutions with solutions of bis(diphenylphosphinylethyl)phosphinic acid in dichloroethane was studied. The stoichiometry of the extractable complexes was determined, and the effect of the inorganic anion and organic diluent on the extraction of rare-earth elements was examined. An increase in the number of phosphoryl groups in the extractant molecule and replacement of ethylene bridges between the phosphorus atoms by methylene bridges enhance the extraction of metal ions from nitric acid solutions.The interest in extraction properties of polyfunctional organophosphorus acids increased recently, because of the prospects for using these agents in radiochemical practice for the recovery of transplutonium, rare-earth (Ln), and other elements from nitric acid solutions [1]. It was shown that dibasic P, P`-di-(2-ethylhexyl)methylenediphosphonic acid [2, 3] and monobasic (diphenylphosphinylmethyl)phenylphosphinic [4] and bis(diphenylphosphinylmethyl)phosphinic (I) [5] acids exhibit extremely high extractive power toward Th(IV), U(VI), Am(III), and Ln(III) in nitric acid solutions. It was suggested that the high extractive power of acid I is due to the possibility of formation of six-membered chelate rings with metal ions, since the phosphoryl groups in this agent are linked with methylene bridges. In this connection, it is interesting to study how the length of the alkylene bridge between the P(O)OH and P(O) fragments and the number of phosphoryl groups in the extractant molecule affect its extractive power.To this end, we studied the extraction of U(VI), Th(IV), Sc(III), and Ln(III) from aqueous solutions of HNO 3 with solutions of bis(2-diphenylphosphinylethyl)phosphinic (II) and 2-phenylethyl-(2-diphenylphosphinylethyl)phosphinic (III) acids in dichloroethane. For comparison, we also studied the extraction with a neutral analog of II, pentaphenyldiethylenetriphosphine trioxide IV [6], and with diphenylphosphinic acid V.

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Solvent Extraction With Organophosphonic Mono-Acidic Esters

Cited by 36 publications

References 50 publications

Adsorption of lanthanides(III) from aqueous solutions by fullerene black modified with di(2-ethylhexyl)phosphoric acid

Adsorption of lanthanides(III) from aqueous solutions by fullerene black modified with di(2-ethylhexyl)phosphoric acid

Ion Transport Mechanisms in Liquid–Liquid Interface

Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions

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