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Studies of the photocatalytic efficiency of titanium dioxide powders and coatings obtained by plasma spraying

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: F.L. Toma, G. Bertrand, S.Ok Chwa, C. Coddet, D. Klein, P. Nardin, A. Ohmori

Editorial: DVS-Verlag, ITSC 2004 Thermal Spray Solutions: Advances in Technology and Application, 2004.

Rezumat:

Titanium dioxide (TiO2) is one of the most important photocatalyst that allows the environmental purification of
water and air by the decomposition of toxic organic compounds and removal of harmful gases. In the photocatalytic
applications, TiO2 can be used in form of powder or coating. In this paper, two techniques of deposition were used
to elaborate thin deposits starting from an agglomerated TiO2 anatase nanopowder: conventional plasma spraying
in atmospheric conditions and suspension plasma spraying. The photocatalytic efficiency of the coatings was
performed with respect to nitrogen oxides (NOx) and compared with the photocatalytic activity of the TiO2 Degussa
P25 powder. Differences in the photocatalytic efficiencies of the nanocoatings obtained by the two techniques of
plasma spraying were obtained. The coatings elaborated by suspension plasma spraying have poor mechanical
properties but better photocatalytic efficiencies. This method is a promising technique to elaborate photocatalytic
coatings for the removal of different air pollutants.

Cuvinte cheie: plasma spraying, suspension plasma spraying, TiO2, Nox, photocatalysis