W-Ag-Ti@γ-Al2O3 particle electrodes for enhanced electrocatalytic pretreatment of coal chemical wastewater

Abstract The preparation of W-Ag-Ti@γ-Al2O3 3D particle electrode was studied, and the preparation process was optimized on the basis of its electrolytic performance and treatment efficiency on coal chemical wastewater. Infrared spectroscopy, X-ray fluorescence, scanning electron microscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy were used to characterize the loaded element, element morphology, and micromorphology of W-Ag-Ti@γ-Al2O3 3D particle electrode. Results show that the optimal conditions for the preparation of W-Ag-Ti@γ-Al2O3 3D particle electrode are as follows: Ti:Ag:W = 10:10:5, the calcination temperature of the particle electrode is 450 ℃, and the number of times of loading is twice. Coal chemical wastewater degradation was significantly influenced by operating conditions. The research on particle electrode regeneration and stability shows good electrolysis performance after four electrolysis procedures. The effects of conductivity, pH, current intensity, aeration, plate spacing, and filling degree on the removal efficiency of chemical oxygen demand (COD), ammonia nitrogen, and total phenol by W-Ag-Ti@γ-Al2O3 particle electrode were studied. Under the optimal optimization conditions, the COD removal rate was 67.6%, the ammonia nitrogen removal rate was 42.8%, and the total phenol removal rate was 51.7%. Three dimensional electrocatalytic system shows good degradation ability and capacity.