Original Paper

Journal of Sol-Gel Science and Technology

, Volume 69, Issue 2, pp 351-356

High temperature stability and photocatalytic activity of nanocrystalline anatase powders with Zr and Si co-dopants

  • Nasrollah Najibi IlkhechiAffiliated withDepartment of Materials Engineering, Faculty of Engineering, Malayer University
  • , Behzad Koozegar KalejiAffiliated withDepartment of Materials Engineering, Faculty of Engineering, Malayer University Email author 

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Abstract

TiO2 nanopowders doped by Si and Zr were prepared by sol–gel method. The effects of Si and Zr doping on the structural, optical, and photo-catalytic properties of titania nanopowders have been studied by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, and UV–Vis absorption spectroscopy. XRD results suggest that adding impurities has a significant effect on anatase phase stability, crystallinity, and particle size of TiO2. Titania rutile phase formation in ternary system (Ti–Si–Zr) was inhibited by Zr4+ and Si4+ co-doped TiO2 in high temperatures (500–900 °C) and 36 mol% anatase composition is retained even after calcination at 1,000 °C. The photocatalyst activity was evaluated by photocatalytic degradation kinetics of aqueous methylen orange under visible radiation. The results show that the photocatalytic activity of the 20 %Si and 15 %Zr co-doped TiO2 nanopowders have a larger degradation efficiency than pure TiO2 under visible light.

Keywords

Titania nanopowders Sol–gel Photo-catalytic activity Si/Zr dopant