Green Leaching of Metallic Platinum Using an Ionic Liquid with Synergistic Organic Acid–Chlorinating Agent Additives

This study explored the potential for an environmentally friendly method refining difficult-to-solubilise noble metals (notably platinum). Conventional noble-metal processes rely on use of strong inorganic acids and oxidants, which cause significant environmental impact. To overcome these challenges, we propose a non-aqueous direct leaching process using ionic liquid, organic acid, chlorinating agent. Our findings indicate that trihexyl(tetradecyl)phosphonium chloride (P66614Cl) in combination with methanesulfonic acid trichloroisocyanuric effectively solubilises metallic platinum. We investigated mechanism ultraviolet–visible spectroscopy confirmed Pt(0) was oxidised to Pt(IV) form PtCl62−. Recovery Pt from Pt-loaded P66614Cl achieved by stripping ammonium nitrate solution. work advances development sustainable methods metals.