Study on the extraction of palladium(II) and platinum(IV) using LIX 84I

The extraction behaviour of Pd(II) and Pt(IV) was studied with LIX84 I (2-hydroxy-5-nonylacetophenone oxime) in HCl medium. The distribution ratios of Pd(II) with LIX 84I are sufficiently high to extract Pd(II) from 0.1 M HCl medium. The Pd-LIX 84I complex has been identified with slope and saturation loading methods. Some thermodynamic values like ΔG, ΔH and ΔS for the Pd-LIX 84I have been determined. The extraction of Pt(IV) with LIX 84I was poor from hydrochloric solutions. However, Pt(IV) was extracted from ammoniacal solutions. The back extraction of Pd(II) was carried out using 6 M HCl and Pt(IV) using 1 M SnCl2 in ∼3 M HCl. Pd(II) and Pt(IV) were separated from common impurities like Fe(III), Al(III), Zn(II), Cu(II) and Ni(II) using LIX 84I. The recoveries of palladium and platinum were 97% and 86%, respectively.