Electrochemical Oxidation of Wastewater Contaminated with Astrazon Red Violet 3RN Dye on Ti/IrO₂/RuO₂: Evaluation of Process Parameters, Kinetics, and Energy Consumption

Document Type : Research Article


Department of Emergency Aid and Disaster Management, Faculty of Applied Science, Ataturk University, Erzurum, TURKEY


The performance of the electrochemical oxidation of wastewater contaminated with Astrazon Red Violet 3RN 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-3RN dye removal efficiency was over 90% at the high concentrations of NaCl (≥ 5.0 mM) and lower pH values (3.0 ≤ pH≤ ~7.5). At the same time, the temperature increases promoted faster degradation and less energy consumption except at 10°C temperature. While the increase in the initial dye concentration had a negative effect on the removal efficiency (from 99.84% to 65.02%), energy consumption increased from 2.5 kW-h/m3  to 3.25 kW-h/m3. Although the change in applied current density did not cause a significant difference in the removal efficiency (from 99.34% to 92.79%), it caused the energy consumption to increase from 3.10 kW-h/m3 to 25.767 kW-h/m3. 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 13.707 kJ/mol. Thermodynamic parameters ΔH°, ΔS°, and ΔG° evaluated by Eyring's equation calculated 11.196 kJ/mol, -0.1244 kJ/mol, and 47.662 for 293 K, respectively.


Main Subjects

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