Heterogeneous Photo-Fenton Reaction Catalyzed by Nanosized Iron Oxides for Water Treatment

Table 2

Preparation methods of iron oxides.

Nomenclature	Chemical	Preparation methods	Reference
Nanorod, nanosphere, and nanohexagon	α-Fe2O3	Hydrothermal	[50]
Nanohematite	α-Fe2O3	Hydrothermal	[51, 52]
—	α-Fe2O3	Chemical precipitation	[53]
—	—	High-energy ball milling	[54]
Nanocomposite	Fe2O3/SiO2	Sol-gel method	[16, 55]
Maghemite (7-8 nm)	—	Microemulsion method	[56]
Fe/SBA-15	Hematite	Two solvent impregnation technique	[57]
	α-Fe2O3	Solvent thermal	[45]
Flower-like hierarchical α-Fe2O3	α-Fe2O3	Vapor-solid growth	[58]
	α-Fe2O3	Solution-combustion	[59]
Flower-like hematite	—	Complexation-mediated oxidation-hydrolysis	[60]
Nanocrystals	α-Fe2O3	Convenient organic phase process	[61]
Nanoparticle	α-Fe2O3	conducting controlled oxidation reactions	[62]
Nanocube	α-Fe2O3	—	[63]
Nanospindle	α-Fe2O3	—	[64]
Nanorod	α-Fe2O3	Ethylenediamine-(EDA-) assisted method	[65, 66]
Nanowire	α-Fe2O3	Oxidation of pure iron	[67]
Nanotube	—	Solutionphase approach	[52, 68]
Nanobelt	α-Fe2O3	Direct thermal oxidation	[69]
Nanoflake	α-Fe2O3	Deposition	[70]