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Oxidation of carboxylic acids in water at IrO2 – Ta2O5 and boron doped diamond anodes / Onofrio Scialdone in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 266–274 Titre : Oxidation of carboxylic acids in water at IrO2 – Ta2O5 and boron doped diamond anodes Type de document : texte imprimé Auteurs : Onofrio Scialdone, Auteur ; Alessandro Galia, Auteur ; Serena Randazzo, Auteur Année de publication : 2012 Article en page(s) : pp. 266–274 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Electrochemical  incineration  Carboxylic  acids  BDD  DSA  Iridium  anode  AOPs  Oxidation  of  organics Résumé : A detailed study was dedicated to the anodic oxidation of three carboxylic acids (namely, oxalic, formic and maleic acid) with the objective to evaluate in a systematic way the effect on the oxidation of carboxylic acids of numerous relevant parameters, including the nature and the concentration of the carboxylic acid, the alimentation regime (potentiostatic vs. amperostatic), the current density and the working potential values, the flowdynamic regime, the temperature and the nature of the electrode material. It was observed that the effect of some operative parameters strongly depends on the nature of the electrode and of the carboxylic acid. As an example, the efficacy of abatement decreased in the order oxalic > formic ≫ maleic at iridium anodes while an opposite trend was observed at diamond anodes (formic ∼ maleic > oxalic), thus confirming that different oxidant agents are involved at these two electrodes. Also the effect of the temperature depends on both the nature of the acid and of the anode. On the other hand, for all electrodes and substrates, higher current efficiencies were obtained when most part of the process was under the kinetic control of the oxidation reaction, i.e., when low current densities and high flow rates were imposed. A detailed study on the effect of concentration was performed. It was found that higher concentrations of carboxylic acids enhanced the current efficiency at all kinetic regimes. A comparison between potentiostatic and amperostatic electrolyses was also carried out. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010746 [article] Oxidation of carboxylic acids in water at IrO2 – Ta2O5 and boron doped diamond anodes [texte imprimé] / Onofrio Scialdone, Auteur ; Alessandro Galia, Auteur ; Serena Randazzo, Auteur . - 2012 . - pp. 266–274. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 266–274 Mots-clés : Electrochemical  incineration  Carboxylic  acids  BDD  DSA  Iridium  anode  AOPs  Oxidation  of  organics Résumé : A detailed study was dedicated to the anodic oxidation of three carboxylic acids (namely, oxalic, formic and maleic acid) with the objective to evaluate in a systematic way the effect on the oxidation of carboxylic acids of numerous relevant parameters, including the nature and the concentration of the carboxylic acid, the alimentation regime (potentiostatic vs. amperostatic), the current density and the working potential values, the flowdynamic regime, the temperature and the nature of the electrode material. It was observed that the effect of some operative parameters strongly depends on the nature of the electrode and of the carboxylic acid. As an example, the efficacy of abatement decreased in the order oxalic > formic ≫ maleic at iridium anodes while an opposite trend was observed at diamond anodes (formic ∼ maleic > oxalic), thus confirming that different oxidant agents are involved at these two electrodes. Also the effect of the temperature depends on both the nature of the acid and of the anode. On the other hand, for all electrodes and substrates, higher current efficiencies were obtained when most part of the process was under the kinetic control of the oxidation reaction, i.e., when low current densities and high flow rates were imposed. A detailed study on the effect of concentration was performed. It was found that higher concentrations of carboxylic acids enhanced the current efficiency at all kinetic regimes. A comparison between potentiostatic and amperostatic electrolyses was also carried out. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010746