Recent Studies of Heterogeneous and Homogeneous Reduction–Oxidation Reactions of U(IV) Ions in Nitric Acid and TBP Phases

Boxall, Colin and Taylor, Robin and Xiao, Shaorong and Koltunov, Valentin and Marchenko, Valery (2002) Recent Studies of Heterogeneous and Homogeneous Reduction–Oxidation Reactions of U(IV) Ions in Nitric Acid and TBP Phases. In: Proceedings of 3rd NUCEF International Symposium: NUCEF 2001 : Scientific Basis for Criticality Safety, Separations and Waste Disposal. Japan Atomic Energy Research Institute, JPN, pp. 205-212.

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Abstract

The results from some of our recent investigations of actinide redox reactions in nitric acid and tributyl phosphate phases are reviewed, including the oxidation of U(IV) by HNO3 and HNO2 and by Np(VI) and Np(V) in 30 % TBP and by Np(VI) in HNO3. The unusual interactions between U(IV), Tc(VII) and NH3OH+ in HNO3 are also discussed. Finally, the photocatalytic heterogeneous reduction of U(VI) by a colloidal semiconductor is presented.