title: Enhanced sonochemical degradation of azure B dye by the electroFenton process.
abstract: The degradation of azure B dye (C15H16ClN3S; AB) has been studied by Fenton, sonolysis and sono-electroFenton processes employing ultrasound at 23 kHz and the electrogeneration of H2O2 at the reticulated vitreous carbon electrode. It was found that the dye degradation followed apparent first-order kinetics in all the degradation processes tested. The rate constant was affected by both the pH of the solution and initial concentration of Fe2+, with the highest degradation obtained at pH between 2.6 and 3. The first-order rate constant decreased in the following order: sono-electroFenton>Fenton>sonolysis. The rate constant for AB degradation by sono-electroFenton is ∼10-fold that of sonolysis and ∼2-fold the one obtained by Fenton under silent conditions. The chemical oxygen demand was abated ∼68% and ∼85% by Fenton and sono-electroFenton respectively, achieving AB concentration removal over 90% with both processes.
authors.affiliation: Centro de Investigación en Ingeniería y Ciencias Aplicadas (CIICAp), Universidad Autónoma del Estado de Morelos (UAEM), Av. Universidad 1001, Col Chamilpa, Cuernavaca, Mor. C.P. 62209, Mexico. ssilva@uaem.mx
authors.forename: Susana Silva
authors.initials: SS
authors.lastname: Martínez
authors.forename: Edgar Velasco
authors.initials: EV
authors.lastname: Uribe
mesh_terms: D001399:Azure Stains / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D005296:Ferrous Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D015394:Molecular Structure; D014465:Ultrasonics
chemical_list: D001399:Azure Stains; D005296:Ferrous Compounds; D002244:Carbon; C025819:Azure B