Peroxi-Electrocoagulation removal of heavy metal particles by a stainless steel electrode coated with TiO2 nanoparticles and an Iron electrode
نویسندگان
1 Department of Chemical Engineering, Babol Noshirvani University of Technology, Shariati Ave., Babol, Iran, Post Code:47148-71167
2 Department of Chemical Engineering, Babol Noshirvani University of Technology, Shariati Ave., Babol, Iran, Post Code:47148-71167
3 Al-Muthanna University, Department of Chemical Engineering, Iraq
doi
10.22090/jwent.2025.03.002چکیده
This study explored cadmium removal from aqueous solutions using peroxi-electrocoagulation (PEC) with iron and TiO2-coated stainless steel electrodes, varying geometry (non-perforated/perforated). FESEM, FTIR, and EDX characterized the TiO2 coating. Response surface methodology (RSM) and Box-Behnken design (BBD) optimized electrocoagulation (EC), determining pH 6, 1.2 A current, and 62 minutes as optimal. Subsequently, PEC was conducted under these conditions (100 mg/L cadmium), examining electrode material and shape effects with/without H2O2. 80-minute experiments assessed pH/temperature variations. The iron electrode configuration achieved 97.1% (with H2O2) and 97.07% (without H2O2) cadmium removal. The iron anode/ TiO2-coated stainless steel cathode achieved 95% (with H2O2) and 96.66% (without H2O2). Energy consumption for iron electrodes was 13.41 kWh/m³ (with H2O2) and 14.14 kWh/m³ (without H2O2), while the iron anode/ TiO2-coated stainless steel cathode consumed 13.54 kWh/m³ (with H2O2) and 11.81 kWh/m³ (without H2O2). Kinetic analysis showed first-order kinetics for iron electrodes without H2O2, and both configurations with H2O2. Thermodynamic analysis indicated an endothermic, non-spontaneous, and chaotic process. Moreover, FTIR examined the electrode geometry. Results showed the iron electrode configuration with H2O2 provided the most effective removal with lower energy consumption.
