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The Effect of Hydrogen Peroxide Concentration on the Oxidative Dissolution of Unirradiated Uranium Dioxide

Published online by Cambridge University Press:  21 March 2011

J. De Pablo ,
I. Casas ,
F. Clarens ,
F. El Aamrani  and
M. Rovira
J. De Pablo
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya, 08028 Barcelona., Spain
I. Casas
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya, 08028 Barcelona., Spain
F. Clarens
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya, 08028 Barcelona., Spain
F. El Aamrani
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya, 08028 Barcelona., Spain
M. Rovira
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya, 08028 Barcelona., Spain
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Abstract

The dissolution rate of unirradiated uranium dioxide was studied in batch experiments as a function of hydrogen peroxide concentration (from 10−5 to 10−3 mol dm−3). Unirradiated UO2(s) was used in order to differentiate surface chemical processes from radiolytic effects. Dissolution rates were determined from both uranium release and hydrogen peroxide consumption. Results showed that H2O2consumption rate was higher than UO2 dissolution rate. This observation may indicate that the overall UO2 oxidative dissolution process would be controlled by the dissolution of the oxidized solid surface. The calculated hydrogen peroxide reaction order was 1 in the H2O2 concentration range from 10−5 to 10−4 mol dm−3, while at higher concentrations no clear dependence was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 409
Copyright
Copyright © Materials Research Society 2001

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References

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