Abstract
Sensitization of titanium dioxide particles platinized and suspended in water was carried out by Ru(bpy) 3 2+, tris(bipirimidine)Ru(II) (Ru(bpym) 3) and porphines to induce dihydrogen evolution by visible light in the presence of sacrificial electron donor, EDTA. It was found that Ru(bpym) 3 2+ is an efficient sensitizer for H 2 formation. High concentration of the Ru(bpy) 3 2+ was required to achieve the photosensitization suggesting adsorption of the sensitizer on the TiO 2. Photochemical deposition of platinum from K 2[PtCl 4] was important to prepare active Pt-loaded TiO 2 photocatalyst. Simple mixing of the TiO 2 and Pt powders in a mortar as usually done for preparing conventional photocatalyst was not effective for the present system showing that electronic channeling between the TiO 2 bulk and the Pt is more important than for usual photocatalysts. The H 2 evolution showed an optimum point at pH 7, which was interpreted by the adsorption of the dye on TiO 2. For the tetrakis(4-carboxyphenyl)porphine and tetrakis(4-sulfonicphenyl)porphine sensitizers, only the absorption of light at Q band was effective.
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