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Thermal spraying for the development of photocatalytic active TiO2 surfaces

: Toma, F.-L.; Bertrand, G.; Klein, D.; Meunier, C.

Sudarshan, T.S.:
Surface modification technologies XXI : Proceedings of the Twenty First International Conference on Surface Modification Technologies held in Paris, 24 - 16 September 2007
S.l.: Valar Docs, 2007
ISBN: 978-0-9817065-0-4
International Conference on Surface Modification Technologies (SMT) <21, 2007, Paris.>
Fraunhofer IWS ()
Titandioxid; Photokatalyse; thermisches Spritzen; chemische Zersetzung; Mikrogefüge; Morphologie; Beschichten

Titanium dioxide (TiO2) is a useful photocatalyst for the decomposition and diminution of pollutants from water and air. In such applications, it can be used in the form of a slurry or immobilized as a thin film or coating obtained by different methods of deposition. The studies performed in the recent years showed that the technique of thermal spraying could be employed to obtain TiO2 deposits with high efficiency for the decomposition of organic compounds. In the present paper we report a comparative study on the microstructure and photocatalytic performance of titania coatings prepared by atmospheric plasma spraying, suspension plasma spraying and high-velocity oxygen fuel spraying. Various titania powders were used as raw materials for spraying. Different suspensions of TiÜ2 nanopowders were carried out to study the influence of the solvent on the coating characteristics. Morphology and microstructural characteristics of the coatings were studied by SEM and X-ray diffraction. The photocatalytic behaviour of the TiCVsurfaces was evaluated from the decomposition of gaseous nitrogen oxides (NOx). The experimental results showed that coatings with remarkable photocatalytic performance were obtained by suspension plasma spraying, whereas the coatings elaborated by conventional thermal spraying presented a less efficiency in the degradation of nitrogen oxides pollutants.