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    • Keywords


      Water extract of wood ash; photocatalyst; TiO$_2$, K$_2$Ti$_6$O$_{13}$/TiO$_2$ composite.

    • Abstract


      In this study, the effect of water extract of wood ash (WEWA) as a reagent from waste was studied on the formation of Ti-O-based photocatalysts. The pH of the reaction solution was controlled by varying the volume of WEWA. In an acidic condition, the products were identified as TiO$_2$, but the K$_2$Ti$_6$O$_{13}$/TiO$_2$ was formed when pH of the solution was ${\ge}$6. Photocatalytic activities of calcined products were investigated through the degradation of methylene blue (MB,cationic dye) and reactive orange (RO, anionic dye) solutions. The TiO$_2$ prepared from acid condition degraded MB and RO under blacklight irradiation but not under visible-light irradiation, while the K$_2$Ti$_6$O$_{13}$/TiO$_2$ degraded MB undervisible-light irradiation through a dye-sensitized photocatalytic mechanism but could not degrade RO. Addition of MB into RO solution improved the photocatalytic degradation of RO by K$_2$Ti$_6$O$_{13}$/TiO$_2$ because MB could be adsorbed on thesurface of K$_2$Ti$_6$O$_{13}$/TiO$_2$ and promoted the MB-sensitized photocatalytic process.

    • Author Affiliations



      1. Division of Physical Science, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand
      2. Department of Chemistry and Center of Excellence in Materials Science and Technology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
      3. Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand
    • Dates

  • Bulletin of Materials Science | News

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