Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (01): 28-31.doi: 10.3866/PKU.WHXB20010106

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Effect of Sulfation on Structure and Photocatalytic Performance of TiO2

Su Wen-Yue;Fu Xian-Zhi;Wei Ke-Mei   

  1. Research Institute of Photocatalysis,Fuzhou University,Fuzhou 350002
  • Received:2000-04-04 Revised:2000-06-26 Published:2001-01-15
  • Contact: Fu Xian-Zhi E-mail:xzfu@fzu.edu.cn

Abstract: TiO2 and /TiO2 photocatalysts were prepared by solgel method and characterized by Xray diffraction (XRD),BET N2 sorption analysis, IR spectroscopy and UVVis Diffuse Reflectance Spectroscopy (DRS).Photocatalytic degradation of CH3Br in air stream was studied over TiO2 and /TiO2 catalysts under various reaction conditions.The results indicated that the structural and photocatalytic properties of TiO2 were greatly improved by sulfation.The sulfated TiO2 (/TiO2) showed excellent reaction activity and stability for CH3Br photocatalytic decomposition even under the moist reaction conditions.It was found that both B acid sites and L acid sites exist on the /TiO2 catalyst,forming cooperative centers with superacidic characteristics.When compared to unmodified TiO2,the /TiO2 catalyst exhibited higher anatase content,smaller crystal size,higher specific surface area,centralized pore size distribution,and the blueshifted band edge of Uvvis adsorption spectra.

Key words: Titania, Sulfation, Photocatalysis, Bromomethane