Kinetics of metal extraction in ionic liquids: Eu3+/HNO3//TODGA/[C1C4im][Tf2N] as a case study

Michal Sypula (1) , Ali Ouadi (1) , Clotilde Gaillard (2) , Isabelle Billard (3)

1 IPHC - Institut Pluridisciplinaire Hubert Curien
2 IPNL - Institut de Physique Nucléaire de Lyon
3 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces

The kinetics of metal transfer in the system Eu 3+ /HNO 3 //TODGA/[C 1 C 4 im][Tf 2 N], where TODGA is N,N,N9,N9-tetraoctyl diglycolamide, is shown to depend on the chemical conditions (nitric acid and TODGA concentrations) and the time needed to reach equilibrium which may vary from less than 10 min to more than 4 h. At [HNO 3 ] = 4 M, a detailed kinetic study is performed for two different concentrations of TODGA. It is shown that the time required for water and acid solubilisation in the IL phase is very short, as is the time for IL solubilisation in the aqueous phase. By contrast, the extraction of Eu(III) takes more than 100 min to be completed and depends on the TODGA concentration. On the basis of these experimental facts, a simple kinetic model is proposed which is able to account for the data.

Domaines: Génie chimique

Michal Sypula, Ali Ouadi, Clotilde Gaillard, Isabelle Billard. Kinetics of metal extraction in ionic liquids: Eu3+/HNO3//TODGA/[C1C4im][Tf2N] as a case study. RSC Advances, 2013, 3 (27), pp.10736. ⟨10.1039/c3ra40651b⟩. ⟨hal-02271589⟩