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An approach for photodegradation mechanism at TiO2/SrTiO3 interface

  • Ubirajara ColetoJr.
  • Rafael A. C. Amoresi
  • Vinícius Teodoro
  • Isabela M. Iani
  • Elson Longo
  • Maria A. Zaghete
  • Leinig A. Perazolli
Article

Abstract

TiO2/SrTiO3 heterojunction powders were obtained and characterized, and their photocatalytic potential was evaluated. The formation of the solid–solid interface was evidenced by secondary-phase formation in the interface region, which was observed using transmission electron microscopy. The photocatalytic efficiency of the TiO2/SrTiO3 heterojunction was higher than that of pure TiO2 and SrTiO3 samples. The photocatalytic behavior was investigated via scavenger experiments, which indicated that the mechanism of charge transfer for the heterojunction was the direct transfer of the electrons at the interface. A surface compositional analysis of the materials revealed that effective electronic-transfer properties of the materials are more important than the content of pre-adsorbed species on the surface for redox reactions. Photoluminescence spectroscopy analyses showed a reduction in the photoluminescent intensity for the heterojunction and emission in distinct regions depending on the defects formed in the heterojunction. These differences in behavior may be related to the different photocatalytic responses observed for pure compounds and heterojunctions; a broad analysis indicates that the mono (\(V_{O}^{ \cdot }\)) and double (\(V_{O}^{{ \cdot \cdot }}\)) ionized vacancies affect the performance of the photocatalyst in the degradation of micropollutants.

Notes

Acknowledgements

This work was supported by the São Paulo Research Foundation (Grant CEPID/CDMF-FAPESP, process no. 2013/07296-2, and 2017/19143-7) and the National Council for Scientific and Technological Development (CNPq). We are also grateful to the LMA-IQ for providing the FEG-SEM facilities.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Ubirajara ColetoJr.
    • 1
    • 2
  • Rafael A. C. Amoresi
    • 1
    • 3
  • Vinícius Teodoro
    • 4
  • Isabela M. Iani
    • 1
  • Elson Longo
    • 4
  • Maria A. Zaghete
    • 1
  • Leinig A. Perazolli
    • 1
  1. 1.LIEC-Chemistry Institute, São Paulo State University-UNESPAraraquaraBrazil
  2. 2.Department of ChemistryFederal Institute of São Paulo-IFSPCatanduvaBrazil
  3. 3.Faculty of Engineering of Guaratingueta-UNESPSão PauloBrazil
  4. 4.LIEC-Department of ChemistryUniversidade Federal de São Carlos-UFSCARSão CarlosBrazil

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