Effects of calcination on structural, photocatalytic properties of TiO 2 nanopowders via TiCl4 hydrolysis

Khalid, N. R., Ahmed, E., Ikram, M. , Ahmad, M., Phoenix, D. A., Elhissi, A., Ahmed, Waqar and Jackson, M. J. (2013) Effects of calcination on structural, photocatalytic properties of TiO 2 nanopowders via TiCl4 hydrolysis. Journal of Materials Engineering and Performance, 22 (2). pp. 371-375. ISSN 1059-9495


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Photocatalytic degradation of methyl orange (MO) in water was examined using TiO2 nanopowders under solar irradiation. These photocatalysts were successfully synthesized by hydrolysis of titanium tetra chloride (TiCl4) in the temperature range of 70-95 C and calcined at higher temperatures of between 400 and 900 C. The samples prepared were characterized using x-ray powder diffraction, scanning electron microscope (SEM) and Fourier transform infrared spectrophotometer (FTIR). UV-Vis spectrometer was used for analyzing the concentration of MO in solution at different time intervals during the photodegradation experiment. Parameters affecting the photodegradation rate such as catalyst crystallinity, concentration of the catalyst, MO concentration, and pH of the solution have been investigated. The results indicate that TiO2 nanopowder was antase at low calcination temperatures in the range of 400-500 C. The sample calcined at 600 C is composed of both anatase and rutile phase. Further increase in the temperature enhanced the intensities of diffraction peaks of the rutile phase. The size of the crystallites for all the samples prepared were found to be in the 6-13 nm range and from SEM micrographs it was in the range of 19-43 nm. The mixture of both phases exhibited a higher photoactivity in comparison with pure anatase or rutile catalysts. © 2012 ASM International.

Keywords:Calcination temperature, Fourier transform infrared spectrophotometers, Methyl Orange, Nano powders, Photo catalytic degradation, Photocatalytic property, Photodegradation rate, UV-vis spectrometer, Azo dyes, Calcination, Catalysts, Chlorine compounds, Diffraction, Hydrolysis, Nanostructured materials, Oxide minerals, Photocatalysis, Photodegradation, Scanning electron microscopy, X ray powder diffraction, Titanium dioxide
Subjects:F Physical Sciences > F200 Materials Science
J Technologies > J511 Engineering Materials
Divisions:College of Science > School of Mathematics and Physics
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ID Code:27150
Deposited On:08 Sep 2017 11:28

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