Trihexyl(tetradecyl)phosphonium bis-2,4,4-(trimethylpentyl)phosphinate micellar behavior in the extraction of Ag(I) from acidic nitrate media - Université de Lorraine Access content directly
Journal Articles Journal of Molecular Liquids Year : 2022

Trihexyl(tetradecyl)phosphonium bis-2,4,4-(trimethylpentyl)phosphinate micellar behavior in the extraction of Ag(I) from acidic nitrate media

Abstract

The distribution of Ag(I) between acidic aqueous phase (HNO 3) and organic phases, composed of trihexyl (tetradecyl)phosphonium bis-(2,4,4-trimethylpentyl)phosphinate (Cyphos Ò IL 104) diluted in kerosene or kerosene/1-decanol, has been studied. In order to elucidate the interactions in solution and the chemical equilibria responsible for Ag(I) extraction by Cyphos Ò IL 104, ionic conductivity, dynamic viscosity, and interfacial tension measurements, determination of water and nitric acid extraction were performed, and the organic phases were characterized by infrared spectroscopy (ATR-FTIR). Ag(I) is extracted by Cyphos Ò IL 104 with high affinity, even under slightly acidic conditions (close to 100% at pH 5). The linear relationship between the logarithm of the distribution ratio of Ag(I) (D) and the logarithm of Cyphos Ò IL 104 concentration exhibits a slope greater than the stoichiometry expected (1:1), demonstrating an atypical extraction equilibrium. The change in the physicochemical properties as a function of Cyphos Ò IL 104 concentration permits to deduce the formation of reverse micelles or aggregates in organic phases at the critical micellar concentration CMC = 0.001 mol L-1. The ATR-FTIR characterization showed that Ag(I) was extracted by the phosphinate group of Cyphos Ò IL 104 with the transfer of water and nitric acid. A thorough analysis of these data indicates a similar mechanism to solvation, and the reverse micelles (or agglomerates) are involved in Ag(I) extraction.
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Dates and versions

hal-03655709 , version 1 (07-09-2022)

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Rafael Rios-Vera, Alexandre Chagnes, Liliana Hernández-Perales, Diana Martínez-Rodríguez, Diana Navarro-Segura, et al.. Trihexyl(tetradecyl)phosphonium bis-2,4,4-(trimethylpentyl)phosphinate micellar behavior in the extraction of Ag(I) from acidic nitrate media. Journal of Molecular Liquids, 2022, 358, pp.119132. ⟨10.1016/j.molliq.2022.119132⟩. ⟨hal-03655709⟩
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