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

doi:10.1016/S1872-2067(18)63152-3

Abstract

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

Ning An, Yuwei Ma, Juming Liu, Huiyan Ma, Jucai Yang, Qiancheng Zhang. Enhanced visible-light photocatalytic oxidation capability of carbon-doped TiO₂ via coupling with fly ash[J]. Chinese Journal of Catalysis, 2018, 39(12): 1890-1900.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63152-3

https://www.cjcatal.com/EN/Y2018/V39/I12/1890

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

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