Citation: CHEN Xiao-Yun, LU Dong-Fang, LU Yan-Feng. Mesoporous N-F Codoped TiO2 Photocatalyst with Visible-Light Response: Preparation Using Cellulose Template and Catalytic Performance[J]. Chinese Journal of Inorganic Chemistry, ;2012, 28(12): 2513-2522.
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A yellow-colored and mesoporous N-F codoped TiO2 photocatalyst (TiONF) with visible-light response was prepared by a hydrolysis-precipitation method using cellulose as the template and TiCl4 as the precursor. The photocatalytic activity was evaluated through the photocatalytic degradation of phenol under ultraviolet (UV), artificial visible (Vis) and solar light irradiation, respectively. The catalysts were characterized by X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG/DSC), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and N2 adsorption-desorption. The results show that the TiONF obtained by using the cellulose template with suitable N-F doping exhibits higher activity under UV, Vis and solar light irradiation than that obtained without the cellulose template. N-F codoping can increase the amount of surface OH- of TiO2, and retards phase transformation. N-doping can form a new band-gap to extend the light response of TiO2 to visible region, F-doping can promote generation of oxygen vacancies on the surface of TiO2, and can increase surface acidity and Ti3+ of TiO2. The addition of the cellulose template can reduce the average grain size and increase the specific area of TiONF.
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