The Kinetics and mechanism of H $_{2}$ O $_{2}$ decomposition at the U $_{3}$ O $_{8}$ surface in bicarbonate solution

McGrady, J. ; Kumagai, Yuta ; Watanabe, Masayuki ; Kirishima, Akira*; Akiyama, Daisuke*; Kitamura, Akira ; Kimuro, Shingo

The rate of U release is affected by bicarbonate (HCO $_{3}$ $^{-}$ ) concentrations in the groundwater, as well as H $_{2}$ O $_{2}$ produced by water radiolysis. To understand the dissolution of U $_{3}$ O $_{8}$ by H $_{2}$ O $_{2}$ in bicarbonate solution (0.1 - 50 mM), dissolved U concentrations were measured upon H $_{2}$ O $_{2}$ addition (300 M) to U $_{3}$ O $_{8}$ /bicarbonate mixtures. As the H $_{2}$ O $_{2}$ decomposition mechanism is integral to U dissolution, the kinetics and mechanism of H $_{2}$ O $_{2}$ decomposition at the U $_{3}$ O $_{8}$ surface was investigated. The dissolution of U increased with bicarbonate concentration which was attributed to a change in the H $_{2}$ O $_{2}$ decomposition mechanism from catalytic at low bicarbonate ( 5 mM HCO $_{3}$ $^{-}$ ) to oxidative at high bicarbonate ( 10 mM HCO $_{3}$ $^{-}$ ). Catalytic H $_{2}$ O $_{2}$ at low bicarbonate was attributed to the formation of an oxidised surface layer.

Language	:	English
Journal	:	RSC Advances (Internet)
Volume	:	11
Number	:	46
Pages	:	p.28940 - 28948
Publication Year/Month	:	2021/08
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Paper URL	:	https://doi.org/10.1039/D1RA05580A
DOI for research data	:
Keywords	:	Dissolution; Reaction Rate; Uranium; Oxidation
Research Facility	:	第4研究棟
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	資源エネルギー庁

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Registration No. : AA20210249
JAEA Abstracts No. : 49001181
Paper Submission No. : 24800

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The Kinetics and mechanism of HO decomposition at the UO surface in bicarbonate solution

The Kinetics and mechanism of H $_{2}$ O $_{2}$ decomposition at the U $_{3}$ O $_{8}$ surface in bicarbonate solution