Electrochemical generation of H2O2 using gas diffusion electrode improved with rGO intensified with the Fe3O4/GO catalyst for degradation of textile wastewater

•The reduced graphene oxide improved the performance of the gas diffusion electrode•The magnetic nanoparticles supported on graphene oxide were more efficient•A high removal of COD and TOC was achieved in the electro-Fenton system•The catalyst modified with graphene oxide could be reused ten times