Electrochemical oxidation of organic pollutants in water at metal oxideelectrodes: A simple theoretical model including direct and indirectoxidation processes at the anodic surface

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Abstract

The electrochemical oxidation of organics in water at metal oxide electrodes was investigated with theaim to discuss the correlations between the instantaneous current efficiency ICE and operative conditionsby considering both the hypothesis of a direct oxidation process and of an indirect process mediated byadsorbed hydroxyl radicals or chemisorbed “oxygen”, in order to explicit the main differences expectedbetween these cases. Thus, a simple theoretical model was discussed, as an extension of previous studiesof Comnnellis and co-workers which were focused on indirect oxidation paths [C. Comninellis, Electrochim.Acta 39 (1994) 1857; O. Simond, V. Schaller, Ch. Comninellis, Electrochim. Acta, 42 (1997) 2009],concerning both the cases of mass transfer control and oxidation reaction control and mixed kineticregimes. A very good agreement, between theoretical predictions and experimental data pertaining tothe electrochemical oxidation of oxalic and formic acid at IrO2–Ta2O5, was observed.
Lingua originaleEnglish
pagine (da-a)6140-6147
Numero di pagine8
RivistaElectrochimica Acta
Volume54
Stato di pubblicazionePublished - 2009

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.1600.1603???

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