Nitrogen-doped TiO2 modified with NH4F for efficient photocatalytic degradation of formaldehyde under blue light-emitting diodes.

A nitrogen-doped TiO(2) (N-TiO(2)) photocatalyst was prepared by calcination of the hydrolysis precipitate of Ti(SO(4))(2) with aqueous ammonia. The prepared N-TiO(2) was treated with NH(4)F (F-N-TiO(2)) by an impregnation-calcination method. The photocatalyst (F-N-TiO(2)) was characterized by X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR), UV-vis diffusive reflectance spectroscopy (DRS), BET and X-ray photoelectron spectroscopy (XPS). With blue light-emitting diode (LED) as the light source, its photocatalytic activity for the degradation of formaldehyde was investigated. NH(4)F treatment enhances markedly photocatalytic activity of N-TiO(2). The treatment increases the visible absorption of N-TiO(2), decreases its specific surface area and influences the concentration of oxygen vacancies in N-TiO(2). Photocatalytic activity of F-N-TiO(2) depends on the visible absorption, the specific surface area, and the concentration of oxygen vacancies. The preparation conditions, such as the calcination temperature and the initial molar ratio of NH(4)F to N-TiO(2), have a significant influence on the photocatalytic activity. The doping mechanism of NH(4)F was investigated.

Li Y ，Jiang Y ，Peng S ，Jiang F ... -  《-》

Preparation and characterization of N-S-codoped TiO(2) photocatalyst and its photocatalytic activity.

Wei F ，Ni L ，Cui P 《JOURNAL OF HAZARDOUS MATERIALS》

Degradation of nitrobenzene using titania photocatalyst co-doped with nitrogen and cerium under visible light illumination.

Shen XZ ，Liu ZC ，Xie SM ，Guo J ... -  《JOURNAL OF HAZARDOUS MATERIALS》

Synthesis, characterization, and photocatalytic activity of TiO(2-x)N(x) nanocatalyst.

Wang YQ ，Yu XJ ，Sun DZ 《JOURNAL OF HAZARDOUS MATERIALS》

The influence of preparation method, nitrogen source, and post-treatment on the photocatalytic activity and stability of N-doped TiO2 nanopowder.

NH(3) plasma, N(2) plasma, and annealing in flowing NH(3) were used to prepare N doped TiO(2), respectively. XRD, UV-vis spectroscopy, N(2) adsorption, FT-IR, Zeta-potential measurement, and XP spectra were used to characterize the prepared TiO(2) samples. The nitridation procedure did not change the phase composition and particle sizes of TiO(2) samples, but extended its absorption edges to the visible light region. The photocatalytic activities were tested in the degradation of an aqueous solution of a reactive dyestuff, methylene blue, under visible light. The photocatalytic activity and stability of TiO(2) prepared by NH(3) plasma were much higher than that of samples prepared by other nitridation procedures. The visible light activity of the prepared N doped TiO(2) was improved by increasing the lattice-nitrogen content and decreasing adsorbed NH(3) on catalyst surface. The lattice-nitrogen stability of N-doped TiO(2) samples improved after HCl solution washing. The possible mechanism for the photocatalysis was proposed.

Hu S ，Li F ，Fan Z 《-》