Electrochemical Oxidation of Benzoic Acid Derivatives on Boron Doped Diamond: Voltammetric Study and Galvanostatic Electrolyses

Abstract

The electrochemical oxidation of aqueous wastes polluted with benzoic and salicylic acids and phthalic anhydride on boron-doped diamond electrodes has been studied. The complete mineralization of the organic waste has been obtained in each case regardless of the nature of the compound, composition of the solution, and current density. Different voltammetric behaviors between benzoic acid, salicylic acid, and phthalic anhydride were obtained in the voltammetric study, but no differences in the electrochemical oxidation of the three compounds seems to exist in the bulk electrolyses study. The total mineralization of the three compounds at different current densities confirms that the oxidation must occur directly on the electrode surface and/or by hydroxyl radicals generated by decomposition of water and/or by other oxidants electro-generated from the sulfate oxidation.

Aromatic hydroxylation reactions by electrogenerated HO radicals: A kinetic study

“…This result shows that the presence of the hydroxyl group in the aromatic ring favors the electron transfer reaction. Besides, these reactions are not reversible and the products formed tend to block the electrode surface decreasing the current in sequential runs (results not shown), as it was previously reported [18,28].…”

Nontraditional Electrode Materials in Environmental Analysis of Biologically Active Organic Compounds

“…Cyclic voltammetry at Si/BDD was used to monitor the destruction of phenolic compounds after the oxidative electrolysis of olive mill wastewaters [108]. Different voltammetric behavior of aniline [109], benzoic and salicylic acids and phthalic anhydride [110], and of hydroquinone, resorcinol and catechol [111] was reported at Si/BDD.…”

Electrochemical oxidation of succinic acid in aqueous solutions using boron doped diamond anodes

“…Similar results were reported by other studies on aliphatic carboxylic acids and alcohols (Canizares et al 2003(Canizares et al , 2008Gandini et al 2000;Ivandini et al 2006;Louhichi et al 2008b;Martinez-Huitle et al 2008;Onofrio et al 2008). Moreover, voltammetric behavior of succinic acid indicates that succinic acid is much more difficult to oxidize than aromatic acids such as benzoic and salicylic acids (Montilla et al 2002;Louhichi et al 2006) which can be explained in terms of chemical structure (aromatic or aliphatic). It appears that radical intermediates of aromatics are more stable than those of aliphatics because of doublebond delocalization which facilitates electrochemical oxidation of aromatics.…”