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Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Cañizares, P. and Groenen-Serrano, Karine and Rodrigo, M.A. and Saez, C. and Savall, André and Weiss, Elsa Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes. (2008) Journal of Applied Electrochemistry, Vol. 38 (n°1). pp.93-100. ISSN 0021-891X

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Official URL: http://dx.doi.org/10.1007/s10800-007-9405-2

Abstract

A new method for the synthesis of peroxomonophosphate, based on the use of boron-doped diamond electrodes, is described. The amount of oxidant electrogenerated depends on the characteristics of the supporting media (pH and solute concentration) and on the operating conditions (temperature and current density). Results show that the pH, between values of 1 and 5, does not influence either the electrosynthesis of peroxomonophosphate or the chemical stability of the oxidant generated. Conversely, low temperatures are required during the electrosynthesis process to minimize the thermal decomposition of peroxomonophosphate and to guarantee significant oxidant concentration. In addition, a marked influence of both the current density and the initial substrate is observed. This observation can be explained in terms of the contribution of hydroxyl radicals in the oxidation mechanisms that occur on diamond surfaces. In the assays carried out below the water oxidation potential, the generation of hydroxyl radicals did not take place. In these cases, peroxomonophosphate generation occurs through a direct electron transfer and, therefore, at these low current densities lower concentrations are obtained. On the other hand, at higher potentials both direct and hydroxyl radical-mediated mechanisms contribute to the oxidant generation and the process is more efficient. In the same way, the contribution of hydroxyl radicals may also help to explain the significant influence of the substrate concentration. Thus, the coexistence of both phosphate and hydroxyl radicals is required to ensure the generation of significant amounts of peroxomonophosphoric acid.

Item Type:Article
Additional Information:The definitive version is available at http://www.springerlink.com/content/818887036687657u/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Universidad de Castilla-La Mancha - UCLM (SPAIN)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Guylène Abadie

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