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

作者：Ilkhechi Nasrollah Najibi; Kaleji Behzad Koozegar^*

来源：Journal of Sol-Gel Science and Technology, 2014, 69(2): 351-356.

DOI：10.1007/s10971-013-3224-1

• Titania nanopowders
• Sol-gel
• Photocatalytic activity
• Si/Zr dopant

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 A degrees C) and 36 mol% anatase composition is retained even after calcination at 1,000 A degrees 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.

• 出版日期2014-2