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Effect of pH on formation of Ti-O-based photocatalysts prepared by green chemistry and their photocatalytic activities

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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 TiO2, but the K2Ti6O13/TiO2 was formed when pH of the solution was ≥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 TiO2 prepared from acid condition degraded MB and RO under blacklight irradiation but not under visible-light irradiation, while the K2Ti6O13/TiO2 degraded MB under visible-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 K2Ti6O13/TiO2 because MB could be adsorbed on the surface of K2Ti6O13/TiO2 and promoted the MB-sensitized photocatalytic process.

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Acknowledgements

We would like to acknowledge the Center of Excellence for Innovation in Chemistry (PERCH-CIC), Ministry of Higher Education, Science, Research and Innovation, Thailand. We would also like to thank Mr Thomas Duncan Coyne for assistance with the English.

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Authors and Affiliations

  1. Division of Physical Science, Faculty of Science, Prince of Songkla University, Songkhla, 90110, Thailand

    Sumetha Suwanboon & Pongsaton Amornpitoksuk

  2. Department of Chemistry and Center of Excellence in Materials Science and Technology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

    Sulawan Kaowphong

  3. Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Songkhla, 90110, Thailand

    Pongsaton Amornpitoksuk

Authors
  1. Sumetha Suwanboon
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  2. Sulawan Kaowphong
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  3. Pongsaton Amornpitoksuk
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Correspondence to Pongsaton Amornpitoksuk.

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Suwanboon, S., Kaowphong, S. & Amornpitoksuk, P. Effect of pH on formation of Ti-O-based photocatalysts prepared by green chemistry and their photocatalytic activities. Bull Mater Sci 45, 214 (2022). https://doi.org/10.1007/s12034-022-02794-2

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  • DOI: https://doi.org/10.1007/s12034-022-02794-2

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