I&EC 168 |
| We have proposed a new reprocessing process by using ionic liquids (ILs) instead of molten salts of alkali chlorides in pyrochemical reprocessing process, as shown in Fig. 1. In order to evaluate applicability of ILs as media of pyro-process, electrochemical properties of uranyl ion and some other metal ions in ILs have been examined by using cyclic voltammetry. A reversible redox couple was observed in a cyclic voltammogram of 1-butyl-3-methylimidazolium chloride containing uranyl chloride. It was supposed that the reaction corresponds to the redox couple of U(VI)/U(V). In 1-butyl-3-methylimidazolium nonafluorobutanesulfonate (BMINfO), irreversible reduction peaks and a sharp oxidation peak were observed in the voltammogram. The reduction peaks should be assigned to multi step reduction of U(VI) to U(IV) via U(V) and/or direct reduction of U(VI) to U(IV). As a result, the deposits including UO2 were found to be produced on a carbon electrode by electrochemical reduction of U(VI) in BMINfO.
|
|
Separation of f-Elements, Sponsored by Separation Science and Technology Sub-Division
9:00 AM-12:00 PM, Thursday, 14 September 2006 Moscone Center -- Room 250, Oral
Division of Industrial & Engineering Chemistry |
