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Extraction du palladium par un malonamide : comportement et spécificités par rapport aux lanthanides

Abstract : Recycling of valuable metals appears as a solution of growing interest for a sustainable supply strategy nowadays. Palladium (Pd), along with other platinum group metals (PGM) and rare earth elements (REEs), represents one of the crucial issues in recovery processes. Malonamides are neutral amphiphilic molecules which have proved their potency for the extraction of lanthanides. These extractants in nitric media were thoroughly studied in frame of nuclear fuel treatment towards lanthanide-actinide separation. Within this framework, our purpose was to study liquid/liquid (L/L) extraction towards palladium recovery from nitric media by a malonamide: the DMDOHEMA. Various parameters such as as equilibration time, pH, extractant and nitrate concentrations were investigated in detail. In some experimental conditions, a palladium-rich solid third phase appears at the interface. These third phases were deeply analyzed with NMR, IR and XPS. Mechanistic studies involved complete analysis of the organic phases, including chemical speciation at the molecular level (coordination chemistry with NMR, IR, XRD), and supramolecular ordering characterization (with SAXS and NMR). Palladium complexes were identified and characterized. Similarities and differences between palladium and lanthanides behavior during extraction were evidenced and both can be efficiently co-extracted or separated according to different experimental conditions.
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Submitted on : Tuesday, April 17, 2018 - 3:49:05 PM
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Rémi Poirot. Extraction du palladium par un malonamide : comportement et spécificités par rapport aux lanthanides. Chimie organique. Université Montpellier II - Sciences et Techniques du Languedoc, 2014. Français. ⟨NNT : 2014MON20165⟩. ⟨tel-01768963⟩

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