Extraction and separation of Pd(II) and Pt(IV) by a urea-substituted ionic liquid

Ueda, Yuki   

Palladium (Pd) and platinum (Pt) are actively used in the wide fields such as automobile and chemical industries due to its remarkable functionality. Therefore, the efficient recycling from the secondary resources is important to ensure stable supply of Pd and Pt resources. In particular, ionic liquid functionalized by organic synthesis is called Task-specific IL(TSIL), and TSIL would be possible to have an extraction ability and a high IL affinity. In this study, urea-substituted TSIL was designed and synthesized for the purpose of mutual separation of Pd(II) and Pt(IV) and its extraction performance was evaluated. In practice, urea-substituted TSIL selectively extracted Pd(II) at pH 4 and Pt(IV) at pH 1 from Pd(II) and Pt(IV) coexisting aqueous solution. In this presentation, slope analysis, EXAFS, UV-Vis, and FT-IR studies on the extraction mechanism of Pd(II) and Pt(IV) are also reported.