DRS exhibited a shift in optical absorption wavelength to visible region and XRD analysis showed that
only the anatase TiO2 formed in both of film and powder. The photocatalytic activity was evaluated
by the degradation of methyl orange (MO) as a model. The modified TiO2 films and powders showed
excellent visible-light photocatalytic ability for the degradation of MO under both irradiation of visible
and sun light. So that, up to 96% MO can be decomposed in sun light only within 3 h in the presence of a
modified TiO2 film consist of Tu/TiO2 molar ratio of 0.45 and 0.9 g PEG. On the other hand, MO solution
was discolored completely under sun light in 75 min in the presence of the modified TiO2 powder.