Enhanced Degradation of Norfloxacin Under Visible Light by S-Scheme Fe2O3/g-C3N4 Heterojunctions.

S-scheme Fe₂O₃/g-C₃N₄ heterojunctions were successfully fabricated by the ultrasonic assistance method to remove norfloxacin (NOR) under visible light irradiation. The synthesized catalysts were well studied through various techniques. The obtained Fe₂O₃/g-C₃N₄ heterojunctions exhibited an optimal photocatalytic degradation of 94.7% for NOR, which was 1.67 and 1.28 times higher than using Fe₂O₃ and g-C₃N₄ alone, respectively. In addition, the kinetic constant of NOR removal with Fe₂O₃/g-C₃N₄ composites was about 0.6631 h^-1, and NOR photo-deegradation was still 86.7% after four cycles. The enhanced photocatalytic activity may be mainly attributed to the formation of S-scheme Fe₂O₃/g-C₃N₄ heterojunctions with built-in electric fields, which were beneficial to the separation and transfer of photostimulated charge carriers. Furthermore, a possible photo-degradation mechanism of NOR for S-scheme Fe₂O₃/g-C₃N₄ heterojunctions is described.