Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (12): 1890-1900.DOI: 10.1016/S1872-2067(18)63152-3

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Enhanced visible-light photocatalytic oxidation capability of carbon-doped TiO2 via coupling with fly ash

Ning Ana, Yuwei Mab, Juming Liua, Huiyan Maa, Jucai Yangc, Qiancheng Zhanga   

  1. a Key Lab of Industrial Catalysis of the Inner Mongolia Autonomous Region, School of Chemical Engineering, Inner Mongolia University of Technology, Huhhot 010051, Inner Mongolia, China;
    b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    c School of Energy and Power Engineering, Inner Mongolia University of Technology, Huhhot 010051, Inner Mongolia, China
  • Received:2018-05-07 Revised:2018-07-20 Online:2018-12-18 Published:2018-09-26
  • Contact: 10.1016/S1872-2067(18)63152-3
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21763020, 20966006), the Science Research Project of Inner Mongolia University of Technology (ZD201707), the Natural Science Foundation of the Inner Mongolia Autonomous Region (2018MS02018), and the Program for Innovative Research Team in Universities of Inner Mongolia Autonomous Region (NMGIRT-A1603).

Abstract:

A carbon-doped TiO2/fly ash support (C-TiO2/FAS) composite photocatalyst was successfully synthesized through sol impregnation and subsequent carbonization. The carbon dopants were derived from the organic species generated during the synthesis of the C-TiO2/FAS composite. A series of analytical techniques, such as scanning electron microscopy (SEM), attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), were used to characterize the properties of the prepared samples. The results indicated that C-TiO2 was successfully coated on the FAS surface. Coupling between C-TiO2 and FAS resulted in the formation of Si-O-C and Al-O-Ti bonds at their interface. The formation of Si-O-C and Al-O-Ti bonds gave rise to a positive shift of the valence band edge of C-TiO2 and enhanced its oxidation capability of photogenerated holes as well as photodegradation efficiency of methyl orange. Moreover, the C-TiO2/FAS photocatalyst exhibited favorable reusability and separability. This work may provide a new route for tuning the electronic band structure of TiO2.

Key words: Fly ash, TiO2, Carbon doping, Visible-light photocatalysis, Photocatalytic oxidation