Abstract
The tetrapyrrolic macrocycle tetrakis-2,3-[5,6-di-(2-pyridyl)-pyrazino]porphyrazine, [Py 8TPyzPzH 2], and its copper(II) derivative, [Py 8TPyzPzCu] were used as sensitizers adsorbed on TiO 2 (anatase) particles for the UV (300–400 nm) photo-degradation of 4-nitrophenol (4-NP) in water suspensions. A 3.5-fold increase of photocatalytic power over bare TiO 2-anatase has been observed in the case of the Cu(II) complex and of more than a factor of two for the free base. Compared with previous data obtained with anatase samples impregnated with some structurally similar porphyrins and phthalocyanines derivatives, these results represent a significant improvement. On the contrary, upon impregnation with [Py 8TPyzPzCu], both TiO 2-rutile and TiO 2-Degussa P25 did not show any improvement of their photocatalytic efficiency. Experimental evidences indicate that formation of singlet oxygen does not contribute to the beneficial effect of the macrocycles. Hydrogen peroxide was found not to participate to the 4-NP depletion. Some photo-bleaching of the adsorbed dye has also been observed.
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