For comparison of photocatalytic activity of thin films and equal
powders, pure TiO2 and Tu/PEG–TiO2 powders were prepared. The
degradation of the aqueous MO in the presence of powders was
measured under visible and sun light irradiation and the results
are shown in Fig. 9. It is clear that powders have the better photocatalytic
activity than thin films that because of high surface area of
powders. Furthermore, modified powder with Tu and PEG exhibits
the better photocatalytic activity than pure TiO2. According to this
figure in the presence of the modified TiO2 powder, complete discoloration
of MO was observed after 120 and 75 min under visible