Preparation and photocatalytic activity ofnano-TiO2 codoped with fluorine and ferric
(1. College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China;
2. College of Chemical and Pharmaceutical Engineering,
Hebei University of Science and Technology, Shijiazhuang 050018, China;
3. School of Civil Engineering, Hebei Engineering University, Handan 056038, China)
2. College of Chemical and Pharmaceutical Engineering,
Hebei University of Science and Technology, Shijiazhuang 050018, China;
3. School of Civil Engineering, Hebei Engineering University, Handan 056038, China)
Abstract: Nano-F−/Fe3+/TiO2 particles were prepared by hydrolysis of tetrabutyl titanate in a mixed CF3COOH-Fe(NO3)3-H2O solution. The photocatalytic decomposition of methylene blue in aqueous solution was used as a probe to evaluate their photocatalytic activities. The powders were characterized by X-ray diffraction (XRD), energy dispersion X-ray spectrum (EDS) and Brunauer-Emmett-Teller (BET) surface area analysis. The results show that F− and Fe 3+ are doped into TiO2. The F− and Fe3+ doping can help to enhance the nano-TiO2 photocatalytic activity greatly. The appropriate codoping conditions for F-Fe are n(F)/n(TiO2)=2%, n(Fe)/n(TiO2)=0.05%, and the degradation rate of methylene blue at 1 h is improved from 73.2% to 87.5%. The codoped nano-F−/Fe3+/TiO2 particles have higher BET specific surface area, smaller crystallite size and higher photocatalytic activity than those of undoped TiO2 particles.
Key words: nano-TiO2; F−/Fe3+/TiO2; codoping; photocatalytic activity