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Sonochemical dissolution of nanoscale ThO2 and partial conversion into a thorium peroxo sulfate

Abstract : The influence of the sample morphology and experimental conditions towards the sonochemical dissolution of nanoscale ThO 2 samples in sulfuric acid media is described. Significant sonochemical dissolution rates and yields are observed at 20 kHz under Ar/O 2 atmosphere in dilute 0.5 M H 2 SO 4 at room temperature, contrasting with the generally-reported high refractory behavior for ThO 2. The dissolution of ThO 2 combines the physical effects driven by acoustic cavitation phenomenon, the complexing affinity of Th(IV) in sulfuric medium and the sonochemical generation of H 2 O 2. These sonochemical conditions further allow the observation of the partial conversion of ThO 2 into a scarce Th(IV) peroxo sulfate with 1D morphology resulting from one or both following processes: dissolution/ reprecipitation or formation of an intermediate Th(IV) surface complex.
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https://hal.umontpellier.fr/hal-02921711
Contributor : Matthieu Virot <>
Submitted on : Tuesday, August 25, 2020 - 2:24:49 PM
Last modification on : Friday, October 23, 2020 - 3:32:00 AM

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Laura Bonato, Matthieu Virot, Xavier Le Goff, Philippe Moisy, Sergey I. Nikitenko. Sonochemical dissolution of nanoscale ThO2 and partial conversion into a thorium peroxo sulfate. Ultrasonics Sonochemistry, Elsevier, 2020, 69, pp.105235. ⟨10.1016/j.ultsonch.2020.105235⟩. ⟨hal-02921711⟩

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