Table 1: Characteristics of photocatalytic oxides.

Photocatalytic oxideZnOTiO2 ITiO2 IITiO2 III

AppearanceFine white powderFine white powderFine white powderFine white powder
Crystal formZinciteAnataseAnataseAnatase
Crystal size (nm)30–40550–6004010
Specific surface area, BET (m2/g)25–351020–30300
ZnO or TiO2 content (%)99,59897,599