Nanostructured photocatalytic titania coatings formed by suspension plasma spraying |
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Authors: | Filofteia-Laura Toma 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, Belfort, France 2. FEMTO-CREST ST (UMR-CNRS 6000), P?le Universitaire des Portes du Jura, Montbéliard, France
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Abstract: | This paper describes formation of titanium dioxide coatings designed for photocatalytic applications, obtained by suspension
plasma spraying (SPS), an alternative of the atmospheric plasma spraying (APS) technique in which the material feedstock is
a suspension of the material to be sprayed. Two different TiO2 powders were dispersed in distilled water and ethanol and injected in Ar-H2 or Ar-H2-He plasma under atmospheric conditions. Scanning electron microscopy (SEM) and x-ray diffraction (XRD) analyses were performed
to study the microstructure of the titania coatings. Photocatalytic efficiency of the elaborated samples was evaluated from
the conversion ratio of different air pollutants: nitrogen oxides (NOx) and sulfur dioxide (SO2). The morphology and crystalline structure of the deposits depended mainly on the nature of the solvent (water or alcohol)
used in the preparation of the slurries. Dense coatings were obtained starting from aqueous suspensions and porous deposits
were elaborated by plasma spraying of a PC105 alcoholic suspension. A significant phase transformation from anatase to rutile
occurred when ethanol was used as a solvent. Different photocatalytic performances were observed as a function of the nature
of the liquid material feed-stock, the spraying parameters, and the nature of the pollutant.
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: | nitrogen oxides photocatalysis sulfur dioxide suspension plasma spraying titanium dioxide |
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