Graphitic carbon nitride and carbon nanotubes modified active carbon fiber cathode with enhanced H2O2 production and recycle of Fe3+/Fe2+ for electro-Fenton treatment of landfill leachate concentrate

g-C 3 N 4 /CNTs/ACF with improved H 2 O 2 production and Fe 2+ regeneration showed an excellent performance in the treatment of landfill leachate concentrate.