Abstract: N-FcodopedTiO2 (TONF) photocatalystswere prepared usingacidcatalyzed hydrolysismethod frommixed aqueous solution of TiCl4 and NH4F. The photocatalytic activity of the TONF was evaluated through the degradation of phenol under both visible and UVlight irradiation. X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), scanning electron microscope (SEM), and N2 adsorption isotherm were used to characterize the obtained powders. The results showed that N-F co-doped TiO2 exhibited significant improvement of visible light catalytic activity. N-F co-doping could improve dispersion of TiO2, inhibit particle size agglomeration, and retard phase transformation. Doped N could extend the light response of TiO2 to visible light region. In addition, narrower band gap formed by F-doping was beneficial to the high visible light photocatalytic activity.

Key words: TiO2, N-F codoping, Visible light, Photocatalyst