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Tetrakis-2,3-[5,6-di-(2-pyridyl)-pyrazino]porphyrazine, and its Cu(II) complex as sensitizers in the TiO 2-based photo-degradation of 4-nitrophenol
Ist Teil von
Journal of photochemistry and photobiology. A, Chemistry., 2011, Vol.220 (1), p.77-83
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2011
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
[Display omitted]
► The title microcycle porphyrazines adsorbed on TiO2 (anatase) are efficient sensitizers for the UV photo-degradation of 4-nitrophenol in water. ► A 3.5-fold increase of photocatalytic power over bare TiO
2-anatase is observed in the case of the Cu(II) complex. ► Structurally similar porphyrins and phthalocyanines adsorbed on anatase are less efficient than our porphyrazines derivatives. ► Singlet oxygen does not contribute to the beneficial effect of the macrocycles. Hydrogen peroxide was found not to participate to the 4-NP depletion.
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.