The photocatalytic activities of TiO2 thin films
were characterized by the degradation of X-3B in
aqueous solution. TiO2 films were deposited from
the TiO2 sol, which was prepared as the pH value
was 2.5 and was proved to possess better crystallinity
by XRD patterns. Fig. 4 shows the variations
in concentrations of X-3B as a function of
irradiation time for TiO2 films with 5, 10, 15, 20
and 25 dip-coating cycles, respectively. X-3B has
good resistance to light degradation. As shown in