The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped TiO2 Powders

Authors

  • Srđan Petrović University of Belgrade, IChTM-Department of Catalysis and Chemical Engineering
  • Ljiljana Rožić University of Belgrade, IChTM-Department of Catalysis and Chemical Engineering
  • Stevan Stojadinović University of Belgrade, Faculty of Physics
  • Boško Grbić University of Belgrade, IChTM-Department of Catalysis and Chemical Engineering
  • Rastko Vasilić University of Belgrade, Faculty of Physics
  • Zorica Vuković University of Belgrade, IChTM-Department of Catalysis and Chemical Engineering
  • Nenad Radić University of Belgrade, IChTM-Department of Catalysis and Chemical Engineering

Abstract

In this study, WO3 doped TiO2 powders were synthesized via sol-gel method combined with a hydrothermal process. The effect of sintering temperature on mesoporous structure and catalytic activities of these powders were investigated. The physical analysis via X-ray diffraction indicates that prepared samples are a mixture of anatase and rutile TiO2 phases. X-ray peak analysis is used to evaluate the crystallite size and lattice strain by the Williamson-Hall analysis. Considering all the reflections of the anatase phase the lattice strain ranging from c = 9.505 to c = 9.548 is calculated, suggesting that microstrain decreases when calcination temperature increases. N2 adsorption-desorption analysis shows that the surface area and pore volume decrease with increasing temperature and that WOx-TiO2 powders primarily consist of mesopores. Sintering temperature induced a change in textural properties causing a systematic shift towards larger mesopores. Simultaneously, photoactivity in decolorization of methyl orange increases with increasing calcination temperature up to 700 °C, followed by significant decrease with its further increase.

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Published

2018-03-13

Issue

Vol. 50 No. 1 (2018)

Section

Articles