Effect of ozone on ruthenium species in alkaline medium – Part I: Oxidative dissolution of ruthenium dioxide hydrate
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Sébastien Floquet
Summary
Several ruthenium species compounds are typically encountered in waste management from nuclear fuel reprocessing operations. Ozone acting as a strong oxidizing agent in aqueous alkaline medium presents some advantages to dissolve rapidly solid deposits of RuO2, xH2O formed into process devices, without generating troublesome byproducts or secondary wastes. In this study, a three-phase solid-gas-liquid column was used for dissolution experiments where the ozone gas flow was contacted with RuO2, xH2O solid particles suspended in sodium hydroxide solution. The analysis of reaction by-products, ruthenate and perruthenate ions, leads us to propose a reaction mechanism. It points out the autocatalytic effect of ruthenate RuO42- in the dissolution reaction mechanism. Parametric experimental study has been performed. It shows that increase of oxidative dissolution kinetics is obtained: (i) with a particular RuO2, xH2O solid morphology, (ii) for an optimum sodium hydroxide concentration near 0.5 M, (iii) by increasing gas-liquid exchange surface area, (iv) by increasing ozone concentration in the gas and (v) by increasing ruthenium initial concentration.
© Oldenbourg Wissenschaftsverlag, München
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- Effect of ozone on ruthenium species in alkaline medium – Part I: Oxidative dissolution of ruthenium dioxide hydrate
- Effect of ozone on ruthenium species in alkaline medium – Part II: Oxidation of pentahydroxo nitrosyl ruthenate(II) ion RuNO(OH)52-
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- Experimental evidence for solubility limitation of the aqueous Ni(II) concentration and isotopic exchange of 63Ni in cementitious systems
- A study on the metal binding of humic acid by multitracer technique
- A simple assay method for added stable caesium in blood plasma
- Removal of mercury from water using pottery
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Articles in the same Issue
- Fission neutron spectrum averaged cross sections of some threshold reactions on cadmium: production feasibility of no-carrier-added 103Pd in a nuclear reactor
- Effect of ozone on ruthenium species in alkaline medium – Part I: Oxidative dissolution of ruthenium dioxide hydrate
- Effect of ozone on ruthenium species in alkaline medium – Part II: Oxidation of pentahydroxo nitrosyl ruthenate(II) ion RuNO(OH)52-
- Studies on thermal decomposition of uranium(VI) and thorium(IV) complexes of o-carboxy N,N′-dimethylbenzylamine by thermoanalytical techniques in static air atmosphere
- Experimental evidence for solubility limitation of the aqueous Ni(II) concentration and isotopic exchange of 63Ni in cementitious systems
- A study on the metal binding of humic acid by multitracer technique
- A simple assay method for added stable caesium in blood plasma
- Removal of mercury from water using pottery
- Berkelium nitrate complex formation using a solvent extraction technique
