NDLI: Possibilities and limitations in separating Pt(IV) from Pd(II) combining imidazolium and phosphonium ionic liquids

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Papaiconomou, Nicolas Billard, Isabelle Svecova, Lenka Chainet, Eric Bonnaud, Céline Cathelin, Loïc
Description	Author Affiliation: Papaiconomou N ( Univ. Savoie, LEPMI, F-73000, Chambéry, France. nicolas.papaiconomou@lepmi.grenoble-inp.fr and Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France.); Svecova L ( Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France and CNRS, LEPMI, F-38000, Grenoble, France.); Bonnaud C ( Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France and CNRS, LEPMI, F-38000, Grenoble, France.); Cathelin L ( Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France and CNRS, LEPMI, F-38000, Grenoble, France.); Billard I ( Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France and CNRS, LEPMI, F-38000, Grenoble, France.); Chainet E ( Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France and CNRS, LEPMI, F-38000, Grenoble, France.)
Abstract	An investigation on a process designed for separating Pt(IV) and Pd(II) dissolved in acidic aqueous solution containing HCl using two ionic liquids, 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide $([OMIM][NTf_{2}])$ and trihexyltetradecylphosphonium bromide (Cyphos 102), is presented. To this end, the single extraction of platinum in $[OMIM][NTf_{2}]$ has been investigated as a function of the initial concentration of Pt(IV) ions dissolved in 1 M HCl. The distribution coefficient for Pt(IV), present in water as a $PtCl_{6}^{2−}$ anion, decreases with the concentration of Pt(IV). The extraction of Pd(II) towards $[OMIM][NTf_{2}]$ or Cyphos 102 as a function of the concentration of HCl in the aqueous phase is also reported. Pd(II), present as $PdCl_{4}^{2−}$ in water, is not extracted using $[OMIM][NTf_{2}].$ On the other hand, the distribution coefficients of Pd(II) using Cyphos 102 are above 2000. In this ionic liquid, Pd(II) is extracted as a $PdBr_{4}^{2−}$ anion. Separation of Pt(IV) from Pd(II) was then carried out starting from aqueous phases containing 1 M HCl and various initial concentrations of Pt(IV). The influence of the number of extraction steps using $[OMIM][NTf_{2}]$ on the extraction of Pt(IV) was also studied. Unlike the results obtained from single extraction experiments of Pt(IV), consecutive extraction of Pt(IV) in water using $[OMIM][NTf_{2}]$ does not improve significantly the extraction of this metal ion. The second step of the extraction process carried out using Cyphos 102 leads to the quantitative extraction of Pd(II) and Pt(IV) remaining in the aqueous phase.
ISSN	14779226
Issue Number	46
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-12-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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