title: Anodic oxidation of salicylic acid on BDD electrode: variable effects and mechanisms of degradation.
abstract: The degradation of 100mL of solution with salicylic acid (SA) in the pH range 3.0-10.0 has been studied by anodic oxidation in a cell with a boron-doped diamond (BDD) anode and a stainless steel cathode, both of 3 cm(2) area, by applying a current of 100, 300 and 450 mA at 25°C. Completed mineralization is always achieved due to the great concentration of hydroxyl radical (OH) generated at the BDD surface. The mineralization rate increases with increasing applied current, but decreases when drug concentration rises from 200 mg L(-1). Nevertheless, the pH effect was not significant. During oxidation it was observed that catechol, 2,5-dihydroxylated benzoic acid, 2,3-dihydroxylated benzoic acid and hydroquinone were formed as aromatic intermediates. In addition, ion-exclusion chromatography allowed the detection of fumaric, maleic, oxalic and formic as the ultimate carboxylic acid.
authors.affiliation: Faculté des Sciences de Sfax, Département de Chimie, 3038 Sfax, Tunisia. chimie_tunisie@yahoo.fr
authors.forename: Nejmeddine
authors.initials: N
authors.lastname: Rabaaoui
authors.forename: Mohamed Salah
authors.initials: MS
authors.lastname: Allagui
mesh_terms: D057919:Biological Oxygen Demand Analysis; D001895:Boron / Q000737:chemistry*; D002244:Carbon / Q000032:analysis; D002264:Carboxylic Acids / Q000737:chemistry; D002850:Chromatography, Gel; D018130:Diamond / Q000737:chemistry*; D004566:Electrodes; D006841:Hydrocarbons, Aromatic / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000737:chemistry; D010084:Oxidation-Reduction; D020156:Salicylic Acid / Q000737:chemistry*; D012996:Solutions
chemical_list: D002264:Carboxylic Acids; D006841:Hydrocarbons, Aromatic; D012996:Solutions; D017665:Hydroxyl Radical; D002244:Carbon; D018130:Diamond; D001895:Boron; D020156:Salicylic Acid