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    Synergism and Aggregation in Multi-Extractant Solvent Extraction Systems

    Year: 2019

    Journal: Solvent Extr. Ion Exch., Volume 37, JUN 7, page 269–283

    Authors: Jackson, Andy; Nilsson, Mikael

    Organizations: US Department of EnergyUnited States Department of Energy (DOE) [120569]

    Keywords: Synergistic extraction; microemulsions; An; Ln separation; mixed complexes; extraction modeling

    Several combinations of lipophilic extractants have been studied with the objective of investigating the synergistic behavior of metal ion extraction and its relation to reverse micelle formation. Combinations of acidic and neutral extracting reagents that have displayed synergic behavior in other studies were tested. While most of these either showed limited synergy or no correlation with water uptake under the conditions used here, two of the systems showed extraction synergy. These two extraction systems: 2-bromodecanoic acid with 2,2MODIFIER LETTER PRIME:6MODIFIER LETTER PRIME,2"-terpyridine; and tributyl phosphine oxide with 2-thenoyltrifluoroacetone were modeled based on two different theoretical approaches: microemulsion-assisted extraction; or the formation of mixed complexes in the organic phase. Comparisons between the two models showed that in the case of bromodecanoic acid and terpyridine the approach of mixed complexes provided a somewhat better fit while the second system was not modeled well with either approach. Further work on the species present in the organic phase is needed to determine the role, if any, of aggregates in synergistic solvent extraction systems.
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