“…The use of iron-containing solids (Fe2O3, Fe3O4, Fe o , FeOH, etc.) and/or the incorporation of the Fenton catalyst into the surface of different carriers (activated carbon, zeolite, clay, multi-walled carbon nanotubes and polymer), which is called heterogeneous Fenton, is an effective approach to overcome these problems [2,9,[13][14][15].…”