Ionic liquids (ILs) with amino moieties were designed and synthesized as extractants for the selective extraction of platinum group metal (PGM) ions into IL phases from mixed aqueous HCl solutions with PGM and other transition metal ions. The loaded PGM ions in the IL phase were successfully back-extracted into an ammonia solution. The back-extraction ability enabled us to apply the current system to a multicycle green PGM-extraction process.
- Extraction and back-extraction
- Ionic liquid
- Platinum group metal