Electrochemical Oxidation of Wastewater Contaminated with Astrazon Red Violet ۳RN Dye on Ti/IrO₂/RuO₂: Evaluation of Process Parameters, Kinetics, and Energy Consumption

The performance of the electrochemical oxidation of wastewater contaminated with Astrazon Red Violet ۳RN Dye on Ti/IrO₂/RuO₂ was evaluated under a range of significant process variables: support electrolyte type and concentration, initial dye concentration, pH, current density, and temperature. ARV-۳RN dye removal efficiency was over ۹۰% at the high concentrations of NaCl (≥ ۵.۰ mM) and lower pH values (۳.۰ ≤ pH≤ ~۷.۵). At the same time, the temperature increases promoted faster degradation and less energy consumption except at ۱۰°C temperature. While the increase in the initial dye concentration had a negative effect on the removal efficiency (from ۹۹.۸۴% to ۶۵.۰۲%), energy consumption increased from ۲.۵ kW-h/m۳  to ۳.۲۵ kW-h/m۳. Although the change in applied current density did not cause a significant difference in the removal efficiency (from ۹۹.۳۴% to ۹۲.۷۹%), it caused the energy consumption to increase from ۳.۱۰ kW-h/m۳ to ۲۵.۷۶۷ kW-h/m۳. Electrooxidation kinetics were evaluated using Pseudo-zero-order, Pseudo-first-order, and pseudo-second-order models. Kinetic data fitted best Pseudo-first-order model. The activation energy (Ea) of the EAOP process calculated using the Arrhenius equation is ۱۳.۷۰۷ kJ/mol. Thermodynamic parameters ΔH°, ΔS°, and ΔG° evaluated by Eyring's equation calculated ۱۱.۱۹۶ kJ/mol, -۰.۱۲۴۴ kJ/mol, and ۴۷.۶۶۲ for ۲۹۳ K, respectively.

کلیدواژه ها:

Electrochemical oxidation ، Decolorization ، Corrosion treatment ، operating parameters ، energy consumption ، Kinetics ، Thermodynamics