Preparation of N-doped TiO2 Photocatalyst and Analysis of Doping Process
N/TiO2光催化剂的制备及掺杂过程分析

N-doped TiO2 photocatalyst was prepared by calcination of hydrated titanium dioxide using saturated urea solution as precipitant in air atmosphere. The obtained yellow samples were characterized by XRD, BET and UV-Vis techniques, and the results indicated that their grain sizes were 10-30 nm, and specific surface areas 30-70 m^2/g, which could absorb visible light wavelength above 400 nm. Photocatalysis results with N-doped TiO2 as photocatalyst showed that over 40% of 2,4-dicholophenol could be degraded after 3 h reaction when using a fluorescent lamp with the main wavelength of 420 nm as the light source. The nitrogen doping process was analysed with TG-DTA, FT-IR and XPS techniques, the results indicated that nitrogen element distributed uniformly in the precursor, and nitrogen was doped into TiO2 lattice in the form of Ti-N bond when the crystalline structure of TiO2 was changed from amorphous to anatase phase.