Issue 3, 2011

Photocatalytic activity of nano and microcrystalline TiO2 hybrid systems involving phthalocyanine or porphyrin sensitizers

Abstract

Hybrid photocatalysts based on TiO2-anatase matrix, representing the both micro- and nano-structures, impregnated with selected lanthanide diphthalocyanine and metalloporphyrin sensitizers, were compared to evaluate their activity and effectiveness in a water suspension catalytic system designed to degrade 4-nitrophenol (4-NP) in a UV-stimulated reaction. Either type of the anatase catalyst was proved to be effective in mineralizing of 4-NP. However, kinetic studies confirmed that the composite's efficiency basically depends on the nature of the macromolecular sensitizer and to a minor extent on the dimensions (micro/nano) of the TiO2 particles. The apparent higher activity observed for the micro-TiO2 catalysts indicates improvement of the electron transfer between the sensitizer and the micro-crystalline structure of TiO2-anatase in contrast to the nano-crystalline matrix. The mechanistic aspects of the observed catalytic performances have been discussed.

Graphical abstract: Photocatalytic activity of nano and microcrystalline TiO2 hybrid systems involving phthalocyanine or porphyrin sensitizers

Article information

Article type
Paper
Submitted
12 Jun 2010
Accepted
06 Aug 2010
First published
03 Sep 2010

Photochem. Photobiol. Sci., 2011,10, 361-366

Photocatalytic activity of nano and microcrystalline TiO2 hybrid systems involving phthalocyanine or porphyrin sensitizers

R. Słota, G. Dyrda, K. Szczegot, G. Mele and I. Pio, Photochem. Photobiol. Sci., 2011, 10, 361 DOI: 10.1039/C0PP00160K

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