Abstract
TiO2 anatase and Degussa (Enovik) P25 thin films were deposited on glass using the sol–gel technique at 600 and 80°C, respectively. The structural, morphological and optical properties of the as-grown TiO2 films were studied against their thickness, for both of the experimental procedures described. Moreover, the photocatalytic activity of the TiO2 samples was investigated regarding the degradation of stearic acid and the decolorization of methylene blue, under UV-A light illumination. In specific, the 90nm-thick (4×) Degussa P25 TiO2 films deposited on glass at 80°C is by far the more photocatalytically active against methylene blue decolorization, reaching an apparent rate constant of 0.094min−1, while the photocatalytic activity of the 110nm-thick (4×) TiO2 thin films deposited on glass at 600°C by sol–gel show the highest stearic acid disappearance rate, i.e., 9.46×10−8mol/min (formal quantum efficiency=10.02×10−3) at 15min of UV-A light illumination.
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