Determination of pK aIL values of three chelating extractants in ILs: Consequences for the extraction of 4f elements

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creativework.keywordsImidazolium, Ionic liquids, pK a, [Tf2N]-, β-Diketones
creativework.publisherSpringer New York LLCbarbara.b.bertram@gsk.comen
dc.contributor.authorAtanassova M.
dc.contributor.authorBillard I.
dc.date.accessioned2024-07-10T14:27:03Z
dc.date.accessioned2024-07-10T14:48:29Z
dc.date.available2024-07-10T14:27:03Z
dc.date.available2024-07-10T14:48:29Z
dc.date.issued2015-04-01
dc.description.abstractAbstract Aqueous-ionic liquid biphasic systems have been examined in terms of water and acid solubilities in the IL-rich phase at ambient temperature. The biphasic mixtures were comprised of acids of various concentrations (H+; Cl-, H+; NO3-, H+; ClO4-, mainly from 1 × 10-2 to 1 × 10-4 mol·dm-3) and four ionic liquids of the imidazolium family [C1C n im][Tf2N] (n = 4, 6, 8 and 10). The effects of ionic medium (μ = 0.1 mol·dm-3, by use of Na+; Cl-, Na+; NO3- or Na+; ClO4-, according to the acid investigated), the nature of the IL cation as well as the nature of the acid on the mutual solubilities of (H2O, H+, [C1C n im]+ and [Tf2N]-) entities were determined. Then, three chelating compounds (HL), which belong to the β-diketone family (thenoyltrifluoroacetone (HTTA), 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (HP) and 4-benzoyl-3-phenyl-5-isoxazolone (HPBI)), were added to [C1C4im][Tf2N] and subsequent determination of the H+ distribution between the two phases allowed the determination of their dissociation constants (pK aIL) in the water-saturated ionic liquid phase. A very strong effect of the IL cation on the HTTA pK aIL value was observed from n = 4 to n = 10. The influence of this phenomenon on the lanthanide extraction process is discussed.
dc.identifier.doi10.1007/s10953-015-0299-z
dc.identifier.issn0095-9782
dc.identifier.scopusSCOPUS_ID:84939957015en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/343
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84939957015&origin=inward
dc.titleDetermination of pK aIL values of three chelating extractants in ILs: Consequences for the extraction of 4f elements
dc.typeArticle
oaire.citation.issue3-4
oaire.citation.volume44
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