title: Kinetic study of electro-Fenton oxidation of azo dyes on boron-doped diamond electrode.
abstract: The present work compares electrochemical degradation of red and blue azo textile dyes in single- and two-compartment electrochemical cells in the presence of Fenton reagent (Fe2+) and using a boron-doped diamond anode. Degradation of both dyes was related to the concentration of dye, applied current density and the concentration of FeSO4 catalyst. Complete colour removal and approximately 91% of organic matter oxidation was achieved in a two-compartment electrochemical cell at an applied current density of 20 mA x cm(-2), pH of 3 and Fe(2+) ion concentration of 0.02 mM. Higher current density and reaction time were required to achieve the same removals in a one-compartment electrochemical cell. Dye degradation kinetics as well as chemical oxygen demand removal rate were successfully modelled to pseudo first-order kinetics. The apparent first-order rate constants (k(o)) for degradation of red dye with an initial concentration of 20, 40 and 60 ppm were found to be 2.67 +/- 0.16, 2.19 +/- 0.09 and 1.5 +/- 0.03 min(-1), and for blue dye at the same initial concentrations were 1.99 +/- 0.2, 0.95 +/- 0.02 and 0.71 +/- 0.030 min(-1), respectively.
authors.affiliation: Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Canada.
authors.forename: Fares
authors.initials: F
authors.lastname: Almomani
authors.forename: Elena A
authors.initials: EA
authors.lastname: Baranova
mesh_terms: D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry*; D057919:Biological Oxygen Demand Analysis; D001895:Boron / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry*; D004566:Electrodes; D005296:Ferrous Compounds / Q000737:chemistry; D007700:Kinetics; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical
chemical_list: D001391:Azo Compounds; D001895:Boron; D004396:Coloring Agents; D018130:Diamond; D005296:Ferrous Compounds; D062065:Wastewater; D014874:Water Pollutants, Chemical; C020748:ferrous sulfate