In order to realize in-situ utilization of weak current generated in microbial fuel cell (MFC)

an MFC-EF coupling system was constructed by utilizing the advantages of electro-Fenton (EF) technology. To further improve the performance of the coupling system

a composite cathode of iron and manganese (FeMnOx/CF composite electrode

CF refers to carbon fiber brush) was prepared

which introduced Fenton-like catalyst manganese on the basis of Fenton catalyst iron. The electrochemical performance of the MFC-EF coupling system and its degradation effect on Rhodamine B (RhB) were investigated by being compared with CF unloaded electrode and Fe&Fe2O3/CF composite electrode. Results showed that FeMnOx/CF composite electrode was successfully loaded with the binary metal oxides of Fe and Mn. The maximum output power of the coupling system was improved (5.47 W/m3)

the internal resistance of the MFC was reduced (109.00 Ω)

and both the removal rate (91.60%) and mineralization rate (30.84%) of RhB were increased. Besides

the FeMnOx/CF composite electrode was free from the strict restriction of catholyte pH in conventional Fenton system

and the pH range of catholyte in MFC-EF coupling system was expanded. The study can realize the regeneration and utilization of resources in the process of pollutant removal

which is expected to provide a new idea for practical dye wastewater treatment.