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Sonochemical dissolution of nanoscale ThO2 and partial conversion into a thorium peroxo sulfate.
Ultrasonics Sonochemistry ( IF 8.7 ) Pub Date : 2020-06-20 , DOI: 10.1016/j.ultsonch.2020.105235
Laura Bonato 1 , Matthieu Virot 1 , Xavier Le Goff 1 , Philippe Moisy 2 , Sergey I Nikitenko 1
Affiliation  

The influence of the sample morphology and experimental conditions towards the sonochemical dissolution of nanoscale ThO2 samples in sulfuric acid media is described. Significant sonochemical dissolution rates and yields are observed at 20 kHz under Ar/O2 atmosphere in dilute 0.5 M H2SO4 at room temperature, contrasting with the generally-reported high refractory behavior for ThO2. The dissolution of ThO2 combines the physical effects driven by acoustic cavitation phenomenon, the complexing affinity of Th(IV) in sulfuric medium and the sonochemical generation of H2O2. These sonochemical conditions further allow the observation of the partial conversion of ThO2 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.



中文翻译:

纳米ThO2的声化学溶解和部分转化为过硫酸sulfate。

描述了样品的形态和实验条件对纳米ThO 2样品在硫酸介质中声化学溶解的影响。与通常报道的ThO 2的高耐火性能相反,在Ar / O 2气氛中于20 kHz ,室温,0.5 MH 2 SO 4稀溶液中观察到了明显的声化学溶解速率和产率。ThO 2的溶解综合了由声空化现象,Th(IV)在硫酸介质中的络合亲和力以及H 2 O 2的声化学生成所驱动的物理效应。这些声化学条件进一步允许观察到ThO 2部分转化为稀有的Th(IV)过氧硫酸盐,其由以下一个或两个过程产生:1D形态:溶解/再沉淀或形成中间Th(IV)表面络合物。

更新日期:2020-06-30
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