Fe2O3-kaolin was examined as a heterogeneous catalyst in electro-Fenton process.
A fluoroquinolone antibiotic, enoxacin, was selected as a model pollutant.
Fe2O3-kaolin increases the efficiency of the electro-Fenton process.
Fe2O3-kaolin decreases loss of soluble iron species to small values (∼0.006 mM).
Electro-Fenton process with Fe2O3-kaolin can be used without pH adjustment.