Influence of the extracted solute on the aggregation of malonamide extractant in organic phases: Consequences for phase stability

Berthon, Laurence; Testard, Fabienne; Martinet, L.; Zemb, Thomas; Madic, C.

doi:10.1016/j.crci.2010.03.024

Cited by 34 publications

(23 citation statements)

References 39 publications

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“…[8] Evaluation of electrostatic interaction with a charged solute allowed to predict curvature-dependant equilibria for peptide extraction. [9,10] An electrical conductivity percolation, [11] which is also less abrupt than for other reverse micelles such as those used to study pesticide (e.g. lindane) extraction, is observed.…”

mentioning

confidence: 97%

“…Diamide extractant aggregates have been accurately characterized experimentally using combined SAXS/ WAXS/osmometry analytical chemistry in "theta" solvents, that is, for intense quenching of liquid-liquid phase separation induced by the penetration of the outer layer of reverse micelles by solvent chains. [11,[16][17][18][19][20] We show here, using molecular dynamics (MD) simulations, that weak aggregation of oil-soluble surfactants, as detected by coupled SANS/SAXS experiments, [16,17] may already exist in the absence of complexed ionic species. The MD simulations herein have been performed in the gas phase in order to test [16,17] All the MD simulations-performed typically for a time of tens of nanoseconds-have been performed taking into account explicit polarization in order to be able to represent proper structures resulting both from 1) weak aliphatic chains interactions, or 2) strong interactions with the highly charged Eu 3 + cation.…”

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confidence: 99%

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Solute‐Induced Microstructural Transition from Weak Aggregates towards a Curved Film of Surface‐Active Extractants

Guilbaud

Zemb

2012

ChemPhysChem

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confidence: 97%

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confidence: 99%

Solute‐Induced Microstructural Transition from Weak Aggregates towards a Curved Film of Surface‐Active Extractants

Guilbaud

Zemb

2012

ChemPhysChem

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“…This demonstrates that 1-octanol can work as a good alternative to 1,2-DCE, and that the use of polar diluents seems to be relevant to maintain the DMDCHTDMA extraction performance. According to the literature, whereas the usual hydrocarbon diluents promote aggregation of the malonamide extractants, [29] polar diluents do not seem to favor this phenomenon; this is possibly the justification of the overall results obtained in this section, as aggregation may be inhibiting Pt(IV) extraction by DMDCHTDMA when commercial diluents are used.…”

Section: Effect Of Different Diluents On the Extraction Of Platinum(iv)mentioning

confidence: 44%

Liquid-Liquid Extraction of Platinum from Chloride Media byN,N′-Dimethyl-N,N′-Dicyclohexyltetradecylmalonamide

Costa

Assunção

Costa³

et al. 2013

Solvent Extraction and Ion Exchange

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Liquid-liquid extraction of platinum(IV) from chloride media was carried out using N,Ndimethyl-N,N -dicyclohexyltetradecylmalonamide (DMDCHTDMA) in 1,2-dichloroethane. Platinum can be effectively extracted by DMDCHTDMA without addition of tin(II) chloride, since extraction percentages (%E) of 88% and 99% have been achieved from 6 M and 8 M HCl, respectively. Moreover, platinum can be successfully stripped through a simple contact with a 1 M HCl solution. The effect of some experimental parameters such as equilibration time, diluent, extractant and HCl concentrations was systematically investigated. The loading capacity of DMDCHTDMA was also evaluated. Data obtained from successive extraction-stripping cycles suggest a good stability pattern of DMDCHTDMA. Preliminary extraction data achieved with single metal ion solutions pointed out to a possible separation of platinum(IV) from palladium(II).

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“…These observations have been made in HNO 3 and HCl solutions, and from NaNO 3 and NaCl solutions at low acidity. FT-IR spectra of TMMA resin after equilibration with solutions of various [HNO 3 ], with and without Eu(NO 3 ) 3 present, have been recorded to characterize the competition between Eu(NO 3 ) 3 and HNO 3 uptake. To design a column chromatographic separation scheme, the loading capacity, the influence of K d on the organic acids, and on co-existing metal ions have been elucidated.…”

Section: Introductionmentioning

confidence: 64%

“…[2][3][4][5][6][7][8][9][10][11][12][13] Although the chemical components and radioactivity of LLW differ from those of HLW, the selectivity and extraction ability of malonamide derivatives suggested their applicability in the analysis of An in solutions of digested LLWs. Recently, malonamide derivatives have been covalently bonded to a polymer to produce a solid extraction resin for column chromatography.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Uptake and Column Chromatographic Separation of Eu, Th, U, and Am by Tetramethylmalonamide Resin

Shimada

Sulakova

Yijia

et al. 2013

Solvent Extraction and Ion Exchange

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A tetramethylmalonamide-functionalized resin (TMMA resin) has been developed and investigated for its ability to separate trivalent, tetravalent, and hexavalent actinide elements. As a fundamental study of the extraction mechanism and to design a chromatographic separation scheme, distribution coefficients (K d ) for partitioning of Eu(III), Th(IV), U(VI), and Am(III) onto the resin from HNO 3 , NaNO 3 , HCl, and NaCl solutions have been determined. The partitioning of HNO 3 onto the resin was also evaluated. The order of the K d values was Th(IV) > U(VI) > Am(III) = Eu(III) in all tested solutions. The competition between metal extraction and HNO 3 extraction was confirmed by the extraction data and FT-IR spectra. The loading capacities of Eu(NO 3 ) 3 and UO 2 (NO 3 ) 2 at 3 M HNO 3 , determined by a dynamic method with TMMA resin (TMMA in the resin was 2.05 mmol/g), were 0.83 mmol/g and 1.6 mmol/g, respectively, implying that M:TMMA stoichiometry was 1:2 for Eu(III) and 1:1 for U. Because the K d values for Th(IV) and U(VI) were greater than 100 in all solutions tested, the influence of organic acids on the K d values of Th(IV) and U(VI) from 3 M and 0.01 M HNO 3 solutions was studied to identify potential stripping agents. The effects of Na, Al, K, Ca, Cr, Ni, and Fe (potential constituents of low-level radioactive waste) on the K d values of Am(III) were also studied. Although the K d values for Am(III) decreased in the presence of 0.01 M Fe(III), the influence of the other ions was negligible. Based on these fundamental experimental results, an extractive chromatographic scheme for actinide isolation was designed and demonstrated.

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Influence of the extracted solute on the aggregation of malonamide extractant in organic phases: Consequences for phase stability

Cited by 34 publications

References 39 publications

Solute‐Induced Microstructural Transition from Weak Aggregates towards a Curved Film of Surface‐Active Extractants

Solute‐Induced Microstructural Transition from Weak Aggregates towards a Curved Film of Surface‐Active Extractants

Liquid-Liquid Extraction of Platinum from Chloride Media byN,N′-Dimethyl-N,N′-Dicyclohexyltetradecylmalonamide

Studies on the Uptake and Column Chromatographic Separation of Eu, Th, U, and Am by Tetramethylmalonamide Resin

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