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

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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.

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Authors and Affiliations

  1. Faculty of Chemistry, Opole University, ul. Oleska 48, 45-095, Opole, Poland

    Rudolf Słota, Gabriela Dyrda & Krzysztof Szczegot

  2. Dipartimento di Ingegneria dell’Innovazione, Universita del Salento, Via Arnesano, 73100, Lecce, Italy

    Giuseppe Mele & Iolanda Pio

Authors
  1. Rudolf Słota
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  2. Gabriela Dyrda
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  3. Krzysztof Szczegot
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  4. Giuseppe Mele
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  5. Iolanda Pio
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Correspondence to Rudolf Słota.

Additional information

This paper is published as part of the themed issue of contributions from the 6th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications held in Prague, Czech Republic, June 2010.

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Słota, R., Dyrda, G., Szczegot, K. et al. Photocatalytic activity of nano and microcrystalline TiO2 hybrid systems involving phthalocyanine or porphyrin sensitizers. Photochem Photobiol Sci 10, 361–366 (2011). https://doi.org/10.1039/c0pp00160k

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  • DOI: https://doi.org/10.1039/c0pp00160k

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