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Visible-light-induced photocatalytic oxidation of nitric oxide and sulfur dioxide: Discrete kinetics and mechanism

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  • Han, Yinghui
  • Zhang, Junjun
  • Zhao, Yi

Abstract

A new photocatalyst was prepared using doped titanium dioxide (TiO2) with active species for the removal of nitric oxide (NO) and sulfur dioxide (SO2) under visible light irradiation. Nitrogen (N-), zirconium (Zr-), and nickel (Ni-) tridoped TiO2 was found to possess higher photocatalytic activity than single Ni-doping, single Zr-doping, bimetallic doping or un-doping TiO2. X-ray diffraction patterns and ultraviolet–visible spectra suggest that N-, Zr-, and Ni-tridoped TiO2 is a mixed-crystal structure that enhances absorption in the visible light region. Kinetic experiments on the removal of NO and SO2 by N-, Zr-, and Ni-tridoped TiO2 under visible light irradiation were carried out in a self-designed photocatalytic reactor respectively. The effects of various operation factors on the reaction rates were evaluated. The reaction rates were successfully expressed by Langmuir–Hinshelwood model. Based on ion chromatography analysis, a visible light induced photocatalytic removal mechanism has been proposed based on N-, Zr-, and Ni-tridoped mixed-crystal TiO2.

Suggested Citation

  • Han, Yinghui & Zhang, Junjun & Zhao, Yi, 2016. "Visible-light-induced photocatalytic oxidation of nitric oxide and sulfur dioxide: Discrete kinetics and mechanism," Energy, Elsevier, vol. 103(C), pages 725-734.
    • Handle: RePEc:eee:energy:v:103:y:2016:i:c:p:725-734
    DOI: 10.1016/j.energy.2015.12.007
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    Cited by:

    1. Wejkowski, Robert & Wojnar, Wacław, 2018. "Selective catalytic reduction in a rotary air heater (RAH-SCR)," Energy, Elsevier, vol. 145(C), pages 367-373.

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