| Summary: | In this study, titanium dioxide powder obtained by the sol-gel method and TiO<sub>2</sub> nanotubes, were prepared. In order to increase the TiO<sub>2</sub> photoactivity, the powders and nanotubes obtained were modified by dye sensitization treatment during the oxide synthesis. The sensitizers applied were Quinizarin (Q) and Zinc protoporphyrin (P). The materials synthesized were extensively characterized and it was found that the dye sensitization treatment leads to modify the optical and surface properties of Titania. It was also found that the effectiveness of the dye-sensitized catalysts in the phenol and methyl orange (MO) photodegradation strongly depends on the dye sensitizer employed. Thus, the highest degradation rate for MO was obtained over the conventional Q-TiO<sub>2</sub> photocatalyst. In the case of the nanotubes series, the most effective photocatalyst in the MO degradation was based on TiO<sub>2</sub>-nanotubes sensitized with the dye protoporfirin (ZnP). Selected catalysts were also tested in the phenol and MO photodegradation under visible light and it was observed that these samples are also active under this radiation.
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