Comparison of the photocatalytic behavior of TiO2 coatings elaborated by different thermal spraying processes |
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Authors: | Filofteia-Laura Toma Dmitry Sokolov Ghislaine Bertrand Didier Klein Christian Coddet Cathy Meunier |
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Affiliation: | 1. Laboratoire d’Etudes et de Recherches sur les Matériaux, les Procédés et les Surfaces (LERMPS), Université de Technologie de Belfort-Montbéliard (UTBM), Site de Sévenans, 90010, Belfort Cedex, France 2. FEMTO-CREST ST (UMR-CNRS 6000) P?le Universitaire des Portes du Jura, 25211, Montbéliard, France
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Abstract: | This paper proposes a comparative study on the microstructure and photocatalytic performances of titanium dioxide coatings
elaborated by various thermal spraying methods (plasma spraying in atmospheric conditions, suspension plasma spraying, and
high-velocity oxyfuel spraying). Agglomerated spray dried anatase TiO2 powder was used as feedstock material for spraying. Morphology and microstructural characteristics of the coatings were studied
mainly by scanning electron microscopy and x-ray diffraction. The photocatalytic behavior of the TiO2-base surfaces was evaluated from the conversion rate of gaseous nitrogen oxides (NOx). It was found that the crystalline
structure depended strongly on the technique of thermal spraying deposition. Moreover, a high amount of anatase was suitable
for the photocatalytic degradation of the pollutants. Suspension plasma spraying has allowed retention of the original anatase
phase and for very reactive TiO2 surfaces to be obtained for the removal of nitrogen oxides.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. |
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Keywords: | high-velocity oxyfuel nitrogen oxides photocatalysis photocatalytic activity plasma spraying suspension plasma spraying titanium dioxide |
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