Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 161-169.doi: 10.3866/PKU.WHXB201228161

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation and Properties of N-F Co-Doped TiO2 Photocatalyst with Wide Range Light Response and Multipore Structure from Ionic Liquid-Water Mixture Solvent

CHEN Xiao-Yun1, LU Dong-Fang2, HUANG Jin-Feng1, LU Yan-Feng1, ZHENG Jian-Qiang1   

  1. 1. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China;
    2. College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China
  • Received:2011-08-16 Revised:2011-10-10 Published:2011-12-29
  • Contact: CHEN Xiao-Yun
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (31000269), Talent Training Program for Distinguished Young Scholars in Universities of Fujian Province, China (JA11072) and Education Department Foundation of Fujian Province, China (JA10121).

Abstract: A yellow N-F co-doped TiO2 photocatalyst (TiONF) exhibited high activity over a wide light spectrum range and a multipore structure was prepared by a hydrolysis-precipitation method using an ionic liquid ([Bmim]PF6)-water mixture as the solvent and TiCl4 as the precursor. Photocatalytic activity was investigated by the photocatalytic degradation of phenol under ultraviolet (UV), artificial visible (Vis), and solar light irradiation. X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), spectroscopy, and N2 adsorption-desorption were used for catalyst characterization. The results show that TiONF synthesis in an ionic liquid-water mixture solvent with suitable N-F doping gives high activity under UV, Vis, and solar light irradiation, and the activities are higher than those obtained by synthesis in pure water. The ionic liquid-water mixture solvent leads to N and F being incorporated into the TiO2 lattice and N-F co-doping can increase the amount of surface OH- on TiO2. The new bandgap formed by N-F doping can induce a second adsorption edge (450-530 nm), which can be excited by Vis irradiation and induce Vis activity. N-F co-doping retards the phase transformation. In addition, an ionic liquid-water mixture as a solvent benefits the dispersion of TiO2, increases the SBET and reduces the particle size.

Key words: TiO2, N-F co-doping, Ionic liquid, Photocatalyst, Visible light


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