LAUSR

Abstract The decolorization of Trypan Blue (TB) in a system of electrochemical oxidation was studied. The influences of key parameters such like pH, initial concentration of dye, hydrogen peroxide concentration, current density, electrode gap and nature of supporting electrolytes on rate of decolorization were investigated through batch experiments. TB was almost completely oxidized in 120 min when the value of current density was kept at 27.27 mA.cm−2 at an initial pH 3. A previously developed semi-empirical kinetic model, based on Fermi’s equation was applied to successfully describe the evolution of TB concentration in Electro-Fenton process. A few adjustable parameters were involved to simultaneously describe the two-part degradation process. The correlation between the model and experimental data was remarkable. The apparent rate constants and the transition time could be simultaneously obtained by model fitting. Electro-Fenton process for aqueous TB dye also reduced COD of aqueous medium and Unit Energy Demand (UED) in kWh/kg COD removed for the given optimal conditions was also calculated.