Ultrasound effects on the dissolution of refractory oxides (CeO2 and PuO2) in nitric acid

Juillet, F.; Adnet, Jean-Marc; Gasgnier, M.

doi:10.1007/bf02034626

Cited by 28 publications

(23 citation statements)

References 10 publications

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“…[20] Ceria reactions with water molecules are typically studied as part of catalytic reactors or fuel cells [21][22][23] emphasising water splitting but ignoring reverse effects of the water-split products on ceria surface and the integrity of the fluorite structure. Acid dissolution of ceria on the other hand is an ongoing bulk-chemistry research topic [14] , [24]. However, in any published data the dissolution rate of ceria remains rather small even under modified experimental conditions including ultrasound [24], addition of Pt catalyst particles, or using multiple acids [14].…”

Section: Introductionmentioning

confidence: 99%

“…Acid dissolution of ceria on the other hand is an ongoing bulk-chemistry research topic [14] , [24]. However, in any published data the dissolution rate of ceria remains rather small even under modified experimental conditions including ultrasound [24], addition of Pt catalyst particles, or using multiple acids [14]. A detailed study of ex-situ irradiative ceria dissolution in water from a nuclear materials point of view [25] finds evidence of radiation-induced acceleration of dissolution.…”

Section: Introductionmentioning

confidence: 99%

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In-situ observation of radiation physics and chemistry of nanostructured cerium oxide in water

Asghar¹,

Inkson²,

Seal³

et al. 2018

Mater. Res. Express

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Room temperature electron irradiation in aqueous environment is applied to CeO 2 nanoparticles using a transmission electron microscope equipped with liquid environmental cell. Oxide dissolution kinetics become accessible at unprecedented scale of spatial and time resolution through irradiation activation of water within a sub-µm size volume, allowing direct measurements of transformation rate and morphologies. Successful liveobservation of the formation of nano-needles provides essential inside in how 1D-nanostructures can form. Furthermore, formation of hydrogen bubbles is found and interpreted in relation to the dose needed for ceria dissolution. The results are of importance for many research applications of ceria in water, e.g. for catalysis, environmental remediation, biomedical radiation protection, anti-corrosion coatings, and ultimately via analogy to UO 2 also for fission-power fuel engineering and waste disposal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-situ observation of radiation physics and chemistry of nanostructured cerium oxide in water

Asghar¹,

Inkson²,

Seal³

et al. 2018

Mater. Res. Express

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“…10 The reductive dissolution of CeO 2 in HNO 3 -H 2 O 2 and HNO 3 -HCOOH mixtures can also be accelerated under the effect of 20 kHz ultrasound. 11 This phenomenon was mostly attributed to ceria grain size reduction and to mass transfer enhancement at the solid-liquid interface initiated by the acoustic cavitation. However, even under ultrasound the dissolution remains very slow when using these experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Catalytic dissolution of ceria under mild conditions

et al. 2012

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The dissolution of ceria is studied through a catalytic reduction process involving platinum nanoparticles in mild conditions at near ambient temperature. The deposition of platinum nanoparticles is made by sonication (Ar, 18 W cm À2 , 20 kHz), and further dissolution is studied as a function of different parameters such as stirring, sonication, dissolution media and temperature. The dissolution is evaluated using UV-vis spectrophotometry, ICP-AES, and SEM. The quantitative dissolution of ceria can be performed in HNO 3 -HCOOH-[N 2 H 5 ][NO 3 ], HNO 3 -[N 2 H 5 ][NO 3 ] or H 2 SO 4 -HCOOH mixtures at 40 C. Nevertheless, it is shown that the combined use of ultrasound with nitric media in the presence of platinum nanoparticles can lead to passivating phenomena resulting in a decrease of the dissolution rate.

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“…PUREX) is important for their recovery and separation necessarily performed with very high yields. Mainly, the studies dealt with the dissolution of oxides [20][21][22] and the valency control of actinide ions in aqueous solutions. High-power ultrasound offers the opportunity to generate in situ redox species with controlled kinetics and therefore suggests the possible application of ultrasound in actinide chemistry.…”

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confidence: 99%

Sonochemical redox reactions of Pu(iii) and Pu(iv) in aqueous nitric solutions

et al. 2015

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The behavior of Pu(iv) and Pu(iii) was investigated in aqueous nitric solutions under ultrasound irradiation (Ar, 20 kHz). In the absence of anti-nitrous reagents, ultrasound has no effect on Pu(iv), while Pu(iii) can be rapidly oxidized to Pu(iv) due to the autocatalytic formation of HNO(2) induced by HNO(3) sonolysis. In the presence of anti-nitrous reagents (sulfamic acid or hydrazinium nitrate), Pu(iv) can be sonochemically reduced to Pu(iii). The reduction follows a first order reaction law and leads to a steady state where Pu(iv) and Pu(iii) coexist in solution. The reduction process is attributed to the sonochemical generation of H(2)O(2) in solution. The kinetics attributed to the reduction of Pu(iv) are however higher than those related to the formation of H(2)O(2) which, after several hypotheses, is explained by the sonochemical erosion of the titanium-based sonotrode. Titanium particles thereby generated can be solubilized under ultrasound and generate Ti(iii) as an intermediate species, a strong reducing agent able to react with Pu(iv).

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Ultrasound effects on the dissolution of refractory oxides (CeO2 and PuO2) in nitric acid

Cited by 28 publications

References 10 publications

In-situ observation of radiation physics and chemistry of nanostructured cerium oxide in water

In-situ observation of radiation physics and chemistry of nanostructured cerium oxide in water

Catalytic dissolution of ceria under mild conditions

Sonochemical redox reactions of Pu(iii) and Pu(iv) in aqueous nitric solutions

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