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Two alternative ways to improve the photocatalytic properties of TiO 2  are tested: a) doping with iron ions and b) attaching a phthalocyanine to the surface. Doped Fe(III)-TiO 2  samples have been prepared by different techniques as by impregnation of Degussa P-25 with iron nitrate and iron acetylacetonate, and by a sol-gel method from TiCl 4  and Fe(acac) 3 . Introduction of Fe(III) in TiO 2  is found to decrease generally the photocatalytic activity in oxidative and reductive photocatalytic reactions as compared with Degussa P-25. Changes on surface and bulk properties of the doped samples compared with those of P-25 explain the decrease of the activity. On the other hand, adsorption of an aluminum tetracarboxylated phthalocyanine onto the TiO 2  surface, renders a stable and reusable material to perform selective photocatalytic oxidations under visible irradiation. Injection of electrons into the semiconductor conduction band from the excited dye, leaving a radical cation, initiates the oxidation reactions. A preliminary kinetic study has been performed and the influence of scavengers, analyzed.

Photocatalysis with Fe/TiO 2 Semiconductors and TiO 2 Sensitized by Phthalocyanines