Synthesis of boron and zirconium co-doped titanium dioxide nanopowders by the sol-gel technique /

Ağartan, Lütfi
Effects of water/Ti precursor molar ratio (R ratio) and calcination regime on the photocatalytic properties of undoped, boron (B) doped, zirconium (Zr) doped, and B and Zr co-doped TiO2 powders synthesized by sol-gel process were researched. Undoped powders were synthesized for R ratio of 1, 3, 5, 10, 30, and 50 while doped and co-doped powders were synthesized for R ratio of 50. Undoped powders were calcined at 300, 400, and 500oC for 1, 2, and 3 h while doped and co-doped powders were calcined at 300 and 500oC for 1 h. X-ray diffraction analysis indicated that doped and undoped powders composed of only anatase crystals, except the undoped powders synthesized for low R ratio calcined at 500oC. Rietveld analyses suggested that B and Zr were successfully doped into the crystal structure of TiO2 and changed the lattice parameters. Scanning electron microscopy investigations revealed that all powders were in the range of 15 to 40 nm in size and were highly agglomerated. Diffuse reflectance spectroscopy measurements showed that all powders had band gap energy of around 3.2 eV and their reflectance could be shifted to visible light region of the electromagnetic spectrum. Upon B and Zr co-doping better methylene blue degradation was achieved in UV light and daylight. The improvement in photocatalytic performance due to co-doping was attributed to the changes in structural and morphological features.


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Preparation of boron-zirconium co-doped photocatalytic titanium dioxide powder
Tokmakçı, Tolga; Öztürk, Abdullah; Jongee, Park; Department of Metallurgical and Materials Engineering (2013)
A titanium dioxide powder co-doped with boron and zirconium was prepared by mechanical ball milling. Photocatalytic performance of the powder was evaluated by degradation of methylene blue (MB) solution under UV illumination. XRD patterns were refined by Rietveld analysis method to obtain accurate lattice parameters and position of the atoms in the crystal structure of TiO2. XRD analysis indicated that the B and/or Zr doped TiO2 powders composed of anatase and did not exhibit any additional phase. Rietveld ...
Citation Formats
L. Ağartan, “Synthesis of boron and zirconium co-doped titanium dioxide nanopowders by the sol-gel technique /,” M.S. - Master of Science, Middle East Technical University, 2014.