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

Research output: Contribution in Book/Report/ProceedingsConference contribution

Published
  • Colin Boxall
  • Robin Taylor
  • Shaorong Xiao
  • Valentin Koltunov
  • Valery Marchenko
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Publication date2002
Host publicationProceedings of 3rd NUCEF International Symposium: NUCEF 2001: Scientific Basis for Criticality Safety, Separations and Waste Disposal
EditorsT. Banba, Y. Tsubata
Place of PublicationTokai, Ibaraki, Japan
PublisherJapan Atomic Energy Research Institute
Pages205-212
Number of pages7
<mark>Original language</mark>English

Conference

Conference3rd NUCEF International Symposium NUCEF 2001
CountryJapan
CityTokai, Ibaraki
Period31/10/012/11/01

Conference

Conference3rd NUCEF International Symposium NUCEF 2001
CountryJapan
CityTokai, Ibaraki
Period31/10/012/11/01

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.