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Ueda, Yuki
no journal, ,
The separation and recovery of PGM is carried out by a hydrometallurgy process mainly based on a solvent extraction method. In recent years, development of alternative solvents for such volatile organic solvents has been advanced. Ionic liquids (IL) has attracted substantial interest in many fields as a green alternative solvent due to their non-volatile, non-flammable, and thermally stable properties. Task-specific ionic liquids (TSIL) that functionalized by incorporating ligating group can give the extraction ability for metal ions. Many extraction systems using IL and TSIL aimed at separating PGM have been reported so far, however there is no extraction system that achieves individual separation of Pd and Pt by one type of TSIL. In this study, imidazolium bis(trifluoromethanesulfonyl) imide type TSIL incorporating a urea group was synthesized and its extraction ability for Pd and Pt was evaluated from a viewpoint the individual separation of Pd and Pt.
Shimojo, Kojiro
no journal, ,
Solvent extraction is an effective method for the separation and purification of metal ions. The efficiency of metal separation with solvent extraction depends on the extractant. In the present study, we have developed novel acidic amide-type extractants DODGAA and TONAADA. The extraction characteristics of DODGAA and TONAADA for 56 metal ions have been comprehensively investigated to collect basic data on the extraction performance and selectivity of each extractant. DODGAA provided remarkably high extraction ability for rare-earth (RE) elements among 56 metal ions, while showing selectivity for heavier RE cations. Furthermore, the mutual separation abilities of DODGAA for light RE cations were higher than those of commercial extractants. In contrast, TONAADA improved the extraction efficiency of almost all metal ions compared with DODGAA. it was found that TONAADA has dual function not only as anionic extractant but also as cationic extractant under highly acidic condition.