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Photocatalytic decomposition of methylene blue via Fenton mechanisms by silicon wafer doped with Au and Cu: a theoretical and experimental study

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Abstract

In this work, we studied the photocatalytic and the structural aspects of silicon wafers doped with Au and Cu submitted to thermal treatment. The materials were obtained by deposition of metals on Si using the sputtering method followed by fast heating method. The photocatalyst materials were characterized by synchrotron-grazing incidence X-ray fluorescence, ultraviolet-visible spectroscopy, X-ray diffraction, and assays of H2O2 degradation. The doping process decreases the optical band gap of materials and the doping with Au causes structural changes. The best photocatalytic activity was found for thermally treated material doped with Au. Theoretical calculations at density functional theory level are in agreement with the experimental data.

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Acknowledgements

We are grateful to the FAPEMIG, FAPESP and CNPq for funding part of this work and CENAPAD-SP for the computational facilitie. This work has been supported by the Brazilian Synchrotron Light Source (LNLS) under proposal D09B-XRF 6637/07.

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Authors and Affiliations

  1. Department of Chemistry, Federal University of Lavras, Lavras, Minas Gerais, 37200-000, Brazil

    Teodorico C. Ramalho

  2. Department of Physical Chemistry, State University of São Paulo, Araraquara, São Paulo, Brazil

    Hudson W. P. Carvalho

  3. Department of Chemistry, University of São Paulo, São Paulo, São Paulo, Brazil

    Ana P. L. Batista

  4. Brazilian Synchrotron Light Laboratory, Campinas, São Paulo, Brazil

    Carlos A. Pérez & Angelo L. Gobbi

Authors
  1. Teodorico C. Ramalho
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  2. Hudson W. P. Carvalho
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  3. Ana P. L. Batista
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  4. Carlos A. Pérez
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  5. Angelo L. Gobbi
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Correspondence to Teodorico C. Ramalho.

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Ramalho, T.C., Carvalho, H.W.P., Batista, A.P.L. et al. Photocatalytic decomposition of methylene blue via Fenton mechanisms by silicon wafer doped with Au and Cu: a theoretical and experimental study. J Mater Sci 44, 1029–1034 (2009). https://doi.org/10.1007/s10853-008-3206-9

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  • DOI: https://doi.org/10.1007/s10853-008-3206-9

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