Sorption recovery of platinum (II, IV) in presence of copper (II) and zinc (II) from chloride solutions

Abstract

The sorption preconcentration of platinum (II, IV) ions was investigated in presence of accompanying copper (II) and zinc (II) ions from chloride solutions on the new ion exchangers CYBBER (Russia), previously unexplored. The initial concentrations of platinum and accompanying ions were 0.25 mmol L-1 and 2.0 mmol L-1, respectively, and the acidity of medium was 0.001 - 4.0 mol L-1. It was shown that the resins investigated - strong and weak basic anion exchangers as well as chelate ion exchangers - possess good sorption and kinetic properties. The simultaneous sorption of investigated ions results in the complete recovery of platinum, while the non-ferrous metal ions are sorbed at less than 20%. Followed by the selective elution of platinum by thiourea (80 g L-1) solution in 0.3 M H2SO4, the quantitative isolation of platinum was achieved (more than 90%). Therefore, the studied ion exchangers can be recommended for recovery and separation of Pt(II,IV), Cu(II) and Zn(II) ions.

Keywords

• ion exchange
• platinum
• copper
• zinc
• chloride solutions