• Role of reactive species in the photocatalytic degradation of amaranth by highly active N-doped WO$_3$

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/040/07/1421-1428

    • Keywords

       

      Nitrogen doping; photocatalysis; visible light active; reactive species; amaranth.

    • Abstract

       

      A novel, highly visible light active N-doped WO$_3$ (N-WO$_3$) is successfully synthesized via thermal decompositionof peroxotungstic acid–urea complex. The photocatalytic activity of N-WO$_3$ is evaluated for the degradation ofamaranth (AM) dye under visible and UVA light along with the role of reactive species, which has not yet been studiedfor N-WO$_3$ photocatalysts. Doping of N into substitutional and interstitial sites of WO$_3$ is confirmed by X-ray photoelectronspectroscopy and X-ray absorption near-edge spectroscopy. At a pH of 7, 1 g l$^{−1}$ of N-WO$_3$ can completely degrade10 mg l$^{−1}$ of AM within 1 h under visible and UVA light. For the degradation of AM by N-WO$_3$ under visible and UVAlight, h$^+$ is found to be the main reactive species, while ${}^{\bullet}$OH contributes to a lesser extent. On the contrary, ${}^{1}$O$^2$, ${}^{\bullet}$O$^{−}_2$ and e$^{−}$show negligible roles. The crucial role of h$^+$ indicates effective suppression of electron–hole recombination after N doping.Dye sensitization and oxidation by reactive species are found to be the major pathway for the degradation of AM undervisible and UVA light, respectively.

    • Author Affiliations

       

      HANGGARA SUDRAJAT1 SANDHYA BABEL1

      1. School of Biochemical Engineering and Technology, Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani 12121, Thailand
    • Dates

       
  • Bulletin of Materials Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.