Table 5. Comparison of the Synthesis Methods of the Materials and the Degradation Performance (%) of the Previously Reported Materials Containing Fe₂O₃ Doped with Various Materials-Based Photocatalysts with the Fe₂O₃–AC in this Study by the Simple Mechanical Alloying Method.

type of photocatalyst	synthesis method	photocatalytic application	degradation performance	reference
FeS2/Fe2O3	heat treatment	carbamazepine	65% (by adding Cr (IV))	Guo et al.96
α-Fe2O3/rGO	heat treatment and ultrasound method	congo red	60%	Wang et al.97
Fe2O3/rGO	hummers method and Heat treatment	4-nitrophenol	98%	Sathish Mohan et al.98
BiVO4/ α-Fe2O3	in situ growth method	tetracycline	∼75.8%	Ma et al.99
Fe3N/Fe2O3/C3N4	facile single-step preparation method	rhodamine B	98%	Padervand et al.100
KNbO3/α-Fe2O3	hydrothermal/solvothermal route	methylene blue	89%	Farooq et al.101
Fe2O3/GO/WO3	green method and ex situ method	phenol	95.4%	Mohamed et al.102
ZrO2/Fe2O3/RGO	hydrothermal route and Hummers method	congo red	98.43%	Anjaneyulu et al.103
ZnO/Fe2O3	sol-gel method	metronidazole	99%	Davari et al.104
CuO/α-Fe2O3/γ-Al2O3	facile wet chemical route	methylene orange	98%	Kanwal et al.105
Fe2O3/25%AC	simple mechanical alloying	methylene blue	89.51	present study
Fe2O3/20%AC	simple mechanical alloying	methylene blue	93.76	present study