Fe-Mn/BC particle electrodes with different loading ratios were prepared by a sol-gel method using corncob biochar (BC) as a carrier. The particle electrodes were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD) and cyclic voltammetry (CV). Using the chemical oxygen demand (COD) removal efficiency of coking wastewater as an indicator of electrocatalytic oxidation performance, the influencing factors of the electrocatalytic oxidation perfor...