Fabrication of double Z-scheme photocatalyst BiOI/g-C3N4/CoFe2O4 with enhanced photocatalytic activity for tetracycline hydrochloride degradation

Double Z-scheme BiOI/g-C3N4/CoFe2O4 was prepared and used for tetracycline hydrochloride degradation under visible light. The degradation rate can reach 85.2% after 240 min. The enhanced photocatalytic performance benefits from the synergistic effect of increased visible light absorption, double Z-scheme charge transfer mechanism and layered structure. Slight photocorrosion of CoFe2O4 causes the degradation process to be divided into a fast stage and a slow stage. BiOI/g-C3N4/CoFe2O4 is still stable during the photocatalytic reaction.