Photocatalytic activity of oxide coatings on fired clay substrates |
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| Authors: | M Fassier N Chouard CS Peyratout DS Smith H Riegler DG Kurth C Ducroquetz MA Bruneaux |
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| Affiliation: | 1. Groupe d’Etude des Matériaux Hétérogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47-73 avenue Albert Thomas, 87065 Limoges Cedex, France;2. Centre Technique de Matériaux Naturels de Construction, 17 rue Letellier, 75015 Paris, France;3. Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany;1. Department of Materials Science and Engineering, Shenzhen Key Laboratory of Advanced Materials, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;2. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;1. Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom;2. FMRIB Centre, University of Oxford, Oxford, United Kingdom;1. Department of Construction, Civil Engineering and Architecture (DICEA), Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy;2. Dipartimento di Ingegneria “Enzo Ferrari”, Università di Modena e Reggio Emilia, via Vignolese 905, 41125 Modena, Italy;1. Department of Soil Science and Engineering, Faculty of Agriculture, University of Maragheh, Maragheh, Iran;2. Departamento de Suelo y Agua, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (CSIC), PO Box 13034, 50080 Zaragoza, Spain;3. Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69518 Vaulx-en-Velin, France;1. International Advanced Research Center for Powder Metallurgy and New Materials, Hyderabad 500 005, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India |
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| Abstract: | The coating of fired clay substrates with various metal oxides, such as anatase, rutile, zinc oxide and tin oxide was achieved using a simple spraying technique followed by a thermal treatment. The photocatalytic activity of the layer was characterized through measurement of the absorption spectrum, in the range 400–800 nm, of methylene blue deposited on top of the coating. Results show that the presence of anatase enhances the degradation of methylene blue when it is exposed to ultraviolet light. Thermal treatment at 1050 °C transforms anatase crystals into thermodynamically stable rutile. This results in a decrease of the photocatalytic activity, which can be explained by increase of the grain size and by a difference in the crystal structure. Measurements of the photocatalytic activity of ZnO and SnO2 show that these two oxides also exhibit photocatalytic properties. In particular, ZnO is a promising alternative material to anatase. |
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