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Uranyl photochemistry: decarboxylation of gluconic acid
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Zhicheng Zhang
Published/Copyright:
November 23, 2010
Abstract
In weakly acidic aqueous solutions, uranyl is able to slowly photolyze gluconic acid under ambient laboratory light (fluorescence lamps). The photolysis follows “complex formation”, resulting in the decarboxylation of gluconic acid (CH2OH(CHOH)4COOH) to form D-arabinose ((CHOH)4OCH2). A possible pathway is proposed to be the sensitized photo-oxidation, which can be described as U(VI)·CH2OH(CHOH)4COOH → U(V) + CH2OH(CHOH)3ĊHOH + CO2 + H+ and U(V) + CH2OH(CHOH)3ĊHOH + H+ → U(VI) + (CHOH)4OCH2 + H2. Also, characterization of the precipitate observed in the photolytic samples demonstrates the presence of tetravalent U, which we believe is generated by concurrent disproportionation of intermediate pentavalent U.
Published Online: 2010-11-23
Published in Print: 2010-11
© by Oldenbourg Wissenschaftsverlag, Pullman, WA 99163, Germany
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- Solubility of tetravalent actinides in alkaline CaCl2 solutions and formation of Ca4[An(OH)8]4+ complexes: A study of Np(IV) and Pu(IV) under reducing conditions and the systematic trend in the An(IV) series
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- Effect of reduction on the stability of Pu(VI) hydrolysis species
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