Characterization of Co²⁺- and Fe³⁺-Codoped TiO₂ Nanomaterials for Photocatalytic Degradation of Organic Pollutants under Visible Light Irradiation

Table 3

Comparison of the BET surface areas of the TiO₂ samples prepared in this work with those of previous works.

Materials	Synthetic conditions	(m^2/g)	Particle size (nm)	References
TiO2-1%Co	Solvothermal treatment at 180°C without calcination	170	6.8	This work
TiO2-5%Co	Solvothermal treatment at 180°C without calcination	164	7.5	This work
TiO2-1%Co-2.5%Fe	Solvothermal treatment at 180°C without calcination	174	6.2	This work
TiO2-Fe	Hydrothermal treatment at 180°C, calcined at 400°C	89	18	[18]
TiO2-0.2%Fe	Sol-gel, calcined at 500°C	78	12	[19]
TiO2-0.2%Fe-2%La	Sol-gel, calcined at 500°C	84	10	[19]
TiO2-0.085%Co	Sol-gel, with following heat treatment from 200°C to 900°C for 30 min	39.7	25	[20]
Fe-Cr-codoped TiO2	Hydrothermal treatment at 180°C, calcined 500°C	93		[18]