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Article Dans Une Revue npj Materials Degradation Année : 2023

Oxidative dissolution of (U,Ce)O2 materials in aqueous solutions containing H2O2

Résumé

Abstract Homogeneous and heterogeneous U 1-x Ce x O 2 (with 0≤ x≤ 0.25) materials were prepared via wet and dry chemistry routes, respectively before being submitted to dynamic leaching experiments. The feeding solution containing 0.20 mmol.L −1 H 2 O 2 was kept under air and renewed to guarantee the stability of H 2 O 2 during the experiment. Normalized alteration rates were determined from U concentration in the leachates. For homogeneous (U,Ce)O 2 materials, the dissolution rate was divided by a factor of 3 when increasing the Ce content from 0.08 to 0.25. Surface characterizations revealed that studtite precipitated all over UO 2 pellet surface and only on the UO 2 grains of heterogeneous U 0.92 Ce 0.08 O 2 samples. The behaviour of this heterogeneous material was similar to that observed for (U,Pu)O 2 in the same conditions, which revealed the reliability of cerium as a plutonium analogue.

Domaines

Chimie
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Origine : Publication financée par une institution

Dates et versions

hal-04093129 , version 1 (09-05-2023)

Identifiants

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Théo Montaigne, Stéphanie Szenknect, Véronique Broudic, Paul-Henri Imbert, Florent Tocino, et al.. Oxidative dissolution of (U,Ce)O2 materials in aqueous solutions containing H2O2. npj Materials Degradation, 2023, 7 (1), pp.34. ⟨10.1038/s41529-023-00348-3⟩. ⟨hal-04093129⟩
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