Photocatalytic activity of visible-light-active iron-doped coatings prepared by plasma spraying

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• 作者：P. Ctibor ; Z. Pala ; V. Stengl ; R. Musalek
• 关键词：B. Spectroscopy ; Band gap ; Plasma spraying ; Photocatalysis ; TiO2&ndash ; Fe2O3
• 刊名：Ceramics International
• 出版年：January, 2014
• 年：2014
• 卷：40
• 期：1_part_PB
• 页码：2365-2372
• 全文大小：1484 K

文摘

This study examines the photocatalytic activity of coatings produced by atmospheric plasma spraying (APS). The applied spraying tools were gas-stabilized (GSP) and water-stabilized (WSP) plasma guns. The TiO₂-Fe₂O₃ powder with and without Na₂SiO₃ additive was produced as agglomerates suitable for feeding into the plasma jet. The coatings are analyzed by scanning electron microscopy, X-ray fluorescence and X-ray diffraction. Photocatalytic degradation of butane under UV and under visible light, as well as the growth kinetics of the products - carbon dioxide and carbon monoxide - is quantified for all coatings and compared with a pure TiO₂ coating. The coatings show a lamellar structure, as it is typical for this process. However, their porosity is rather high. Anatase titania from the feedstock powder is converted into rutile phase in all coatings; whereas the presence of FeTiO₃ is detected in the coating without Na₂SiO₃ made by WSP and metallic iron in the GSP coating. The coating from powder with Na₂SiO₃ admixture is partly amorphous. This coating is photocatalytically active especially under UV, whereas under visible light it is overcome by the WSP coating. The GSP coating has the best photocatalytic activity under both different radiations.