Nb-Doped TiO₂ Photocatalysts Used to Reduction of CO₂ to Methanol

Table 2

Surface area and average particle size of the synthesized photocatalytic powders.

Photocatalyst (% Nb (w/w))	SBET area (m^2·g^−1)	Average particle size (nm)	Photocatalyst (% Nb (w/w))	SBET area (m^2·g^−1)	Average particle size (nm)
Nb–TiO2 0.0%	22.6	15	Nb–TiO2 0.0% SPT	25.8	15
Nb–TiO2 0.5%	23.4	15	Nb–TiO2 0.5% SPT	28.2	14
Nb–TiO2 1.0%	32.6	15	Nb–TiO2 1.0% SPT	37.3	14
Nb–TiO2 2.5%	31.6	13	Nb–TiO2 2.5% SPT	37.2	13

SPT: modification through sputtering.