Preparation, characterization and photocatalytic activity of N-doped TiO₂ nanocrystals

Hong-tao Gao1,2), Jing Zhou1), Dong-mei Dai1), and Guang-jun Liu2) 1) College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China 2) Department of Chemistry, Jining University, Jining 273155, China

摘 要：N-doped TiO2 nanocrystals were prepared using titanium alkoxide as precipitant with different proportional materials. The products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and UV-vis diffuse reflectance spectra. It is confirmed experimentally that the photocatalytic activity of N-doped TiO2 is much higher than that of Degussa P25, when used for the degradation of crystal violet. The degradation kinetics follows an apparent first-order reaction, which is consistent with a generally observed Langmuir-Hinshelwood mechanism. The doping of TiO2 with nitrogen significantly increases the absorption in the region of visible light. The energy of the band gap of N-doped TiO2 is 2.92 eV. The better performance of N-doped TiO2 can be explained by the fact that it is also excited with longer-wavelength light.

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