Phase formation of nano-TiO2 particles during flame spraying with liquid feedstock
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The nanostructured TiO2 photocatalytic coatings were synthesized through flame spraying with liquid feedstock under different conditions. The nanostructured TiO2 deposit of substantial anatase phase was annealed at different temperatures. X-ray diffraction analysis showed that significant transformation from anatase to rutile occurred at a temperature above 600 °C. However, thermal analysis suggested that the phase transformation from anatase to rutile started at a temperature from 400 to 500°C. It was found that the grain size of rutile phase was larger than that of anatase. The deposits annealed at temperatures lower than 450°C were photocatalytically active. However, the deposit annealed at 500°C, which contained 95% anatase crystalline, became photocatalytically inactive. Based on the experimental findings, a model is proposed to explain the phase transformation of the nano-TiO2 particles and the phase formation in flame-spraying of nanostructured TiO2 deposit with liquid feedstock.
Keywordsflame spraying with liquid feedstock nanoparticle phase formation phase transformation photocatalytic coating TiO2
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- 2.D.F. Ollis and H. Al-Ekabi, Photocatalytic Purification and Treatment of Water and Air, Elsevier, The Netherlands, 1993Google Scholar
- 9.C-J. Li, G-J. Yang, and Z. Wang, Effect of Spray Parameters on the Structure of Nano-Structured TiO2 Deposits by Liquid Flame Spray Process, International Thermal Spray Conference, E. Lugscheider and C.C. Berndt, Ed., DVS Deutscher Verband für Schweißen, Düsseldorf, Germany, 2002, p 544–549Google Scholar
- 18.G-J. Yang, C-J. Li, F. Han, and S-F. Mao, Preparation of TiO2 Photocatalyst by Thermal Spraying with Liquid Feedstock, Thermal Spray 2003: Advancing the Science and Applying the Technology, B.R. Marple and C. Moreau, Ed., ASM International, 2003, p 675–680Google Scholar