Fabrication of Fluorine Doped Ti/SnO2-Sb/α-PbO2/F-doped β-PbO2 Electrode and Optimized Treatment of Dye Wastewater Using Response Surface Methodology in Plate and Frame Electrolytic Cell

Metal-oxide electrode with high catalytic performance and good corrosion resistance is the core of electrochemical oxidation. PbO ₂ electrodes have a long service life, excellent electrocatalytic stability and electrochemical corrosion resistance. Electrochemical treatment of dyeing wastewater has many advantages, but its practical application is restricted by high energy consumption. In this paper, by optimizing the NaF doping concentration, the β-PbO ₂ electrode with the best decolorization performance for methylene blue wastewater was prepared, and the prepared electrode has the highest oxygen evolution potential of 1.81V and the longest accelerated life of 32 h. The optimized PbO ₂ electrode was used in a plate frame electrolytic cell to treat methylene blue wastewater, and the electrolytic conditions were optimized to reduce energy consumption. The quadratic multivariate fitting model of electrolytic conditions on decolorization rate and energy consumption was established by the response surface method. The experimental results show that the fitting effects of the two models were good, and the adjusted R ² square was greater than 0.99. The Pareto solution set was obtained by the NSGA-Ⅲ algorithm. The optimized operation condition with the lowest energy consumption was investigated and listed as follows: current density is 9.37 mA/cm ² , electrolyte concentration is 0.025 M, pH value is 6.37 and electrolytic time is 10 min. The optimized energy consumption per ton of wastewater treatment is 4.60 kWh.