Application of quaternary phosphonium salts as extractants of ru(iii ) and rh(iii ) from model aqueous solutions

Martyna RZELEWSKA*, Małgorzata JANISZEWSKA, Magdalena REGEL-ROSOCKA – Institute of Chemical Technology and Engineering, Poznan University of Technology, Poznan, Poland
Please cite as: CHEMIK 2016, 70, 9, 515–520

In the recent years there is a growing interest in the reactive extraction of PGM (Platinum Group Metal) ions and noble metals from secondary sources (e.g. spent catalysts catalysts) from aqueous chloride solutions using organic phases containing various extractants [1, 2]. PGM prices at the global market remain high, due to a high demand, energy-consuming and expensive mining process, as well as depleting natural resources [3].

PGMs have unique physical and chemical properties, such as a high melting and boiling point, high chemical resistance and good catalytic properties. Therefore, they are widely used in chemical (Pt, Pd, Ir, Ru), automotive (Pt, Pd, Ru, Rh), electrical and electronic industries (Pt, Rh, Ru, Ir), as well as in medicine (Pt, Ru) and dentistry (Pd, Pt, Ru). At the same time, these PGM application fields generate a very high amount of waste containing PGMs that should be recycled [3].

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