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Article Dans Une Revue Molecules Année : 2019

Rh(III) Aqueous Speciation with Chloride as a Driver for Its Extraction by Phosphonium Based Ionic Liquids

Résumé

In this work, the aqueous speciation of Rh(III) in chloride medium was investigated by UV-vis spectroscopy for ligand to metal ratios R = (Cl −)/(Rh) ranging from 300 to 5000, at fixed Rh concentration (2.4 × 10 −3 M). Under the chemical conditions of this work, no time evolution was observed, which allows for the fitting of the UV-vis data by Principal Component Analysis (PCA) and Multi-Curve Resolution (MCR). From this, and by comparison with literature data, the three independent species [RhCl 4 ] − , [RhCl 5 ] 2− and [RhCl 6 ] 3− were identified, their individual absorption spectra derived and their respective contribution to the collected experimental UV-vis spectra calculated. Then, extraction of Rh(III) towards the ionic liquid trihexyltetradecylphosphonium chloride was performed. Comparison with the speciation data gives insight into the extraction mechanism and the extracted species.
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Dates et versions

hal-02271231 , version 1 (26-08-2019)

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Lenka Svecova, Nicolas Papaiconomou, Isabelle Billard. Rh(III) Aqueous Speciation with Chloride as a Driver for Its Extraction by Phosphonium Based Ionic Liquids. Molecules, 2019, 24 (7), pp.1391. ⟨10.3390/molecules24071391⟩. ⟨hal-02271231⟩
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