Macro–meso-porous TiO2, ZnO and ZnO–TiO2-composite thick films. Properties and application to photocatalysis

Jayasankar Mani; Hazem Sakeek; Salah Habouti; Matthias Dietze; Mohammed Es-Souni

doi:10.1039/C1CY00302J

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Macro–meso-porous TiO₂, ZnO and ZnO–TiO₂-composite thick films. Properties and application to photocatalysis†

Jayasankar Mani,^a Hazem Sakeek,‡^a Salah Habouti,^a Matthias Dietze^a and Mohammed Es-Souni*^a

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* Corresponding authors

^a Institute for Materials & Surface Technology, University of Applied Sciences Kiel, Grenzstrasse 3, 24149 Kiel, Germany
E-mail: me@fh-kiel.de

Abstract

We report on a new and versatile method for preparing homogenous, crack-free and macro–meso-porous thick films of TiO₂, ZnO and ZnO–TiO₂ composites using a single step coating procedure and fairly low annealing temperatures of a maximum of 400 °C. The method relies on an oxide nanopowder filler in an optimized precursor solution. The films are well adherent to the substrate, show homogeneously distributed open porosity, and are hydrophilic. The photocatalytic activity of these films was characterized using methyl orange as a model dye. We show that the TiO₂ films have better photocatalytic activity than ZnO and ZnO–TiO₂ composite films. The advantages of these composite films over particulate photocatalysts lie in their robustness and ease of application as no filtration is needed. Furthermore it is possible to apply them on suitable large area membranes.

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Article information

DOI: https://doi.org/10.1039/C1CY00302J
Article type: Paper
Submitted: 04 Aug 2011
Accepted: 28 Oct 2011
First published: 14 Nov 2011

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Catal. Sci. Technol., 2012,2, 379-385

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Macro–meso-porous TiO₂, ZnO and ZnO–TiO₂-composite thick films. Properties and application to photocatalysis

J. Mani, H. Sakeek, S. Habouti, M. Dietze and M. Es-Souni, Catal. Sci. Technol., 2012, 2, 379 DOI: 10.1039/C1CY00302J

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