Thermodynamic modeling of extraction equilibria of platinum and palladium with nonylthiourea from hydrochloric acid media
2004 (English)In: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 39, no 15, 3665-3677 p.Article in journal (Refereed) Published
Models of extraction equilibria of Pt(IV) and Pd(II) with Nonylthiourea (NTH) from HCl media have been studied. The conditional equilibrium constants and the stoichiometry of the extracted species of Pt(IV) with NTH at different ionic strengths obtained by numerical analysis using the LETAGROP-DISTR program are reported. The dependence of the extraction constant values on the ionic strength has been analysed using the Specific Interaction Theory (SIT), from which the respective thermodynamic equilibrium constants of the extraction of Pt(IV) and Pd(II) with NTH have been determined. The thermodynamic equilibrium constants determined for Pt(IV) are log K-11o=5+/-1 and log K-14(o)=14.6+/-0.2, while for Pd(II) log K-11(o)=4.9+/-0.1 and log K-12(o)=9.17+/-0.08. The interaction coefficients, epsilon, for the pairs (H+, PtCl62-) and (H+, PdCl42-) have also been estimated to be 0.30+/-0.08 and 0.41+/-0.02, respectively.
Place, publisher, year, edition, pages
2004. Vol. 39, no 15, 3665-3677 p.
platinum, palladium, thermodynamic modeling, aqueous-solutions, electrolytes
IdentifiersURN: urn:nbn:se:kth:diva-23916DOI: 10.1081/ss-200039123ISI: 000225404100012ScopusID: 2-s2.0-9144256366OAI: oai:DiVA.org:kth-23916DiVA: diva2:342615
QC 20100525 QC 201109142010-08-102010-08-102011-09-14Bibliographically approved