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Photocatalyst TiO2–Co: the effect of doping depth profile on methylene blue degradation

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Abstract

In this work, we study the effect of doping depth profile on the photocatalytic and surface properties of TiO2 films. Two thin film layers of TiO2 (200 nm) and Co (5 nm), respectively, were deposited by physical evaporation on glass substrate. These films were annealed for 1 s at 100 and 400 °C and the Co layer was removed by chemical etching. Atomic force microscopy (AFM) phase images showed changes in the surface in function of thermal treatment. The grazing-incidence X-ray fluorescence (GIXRF) measurements indicated that the thermal treatment caused migration of Co atoms to below the surface, the depths found were between 19 and 29 nm. The contact angle showed distinct values in function of the doped profile or Co surface concentration. The UV–vis spectra presented a red shift with the increasing of thermal treatment. Photocatalytical assays were performed by methylene blue discoloration and the higher activity was found for TiO2–Co treated at 400 °C, the ESI-MS showed the fragments formed during the methylene blue decomposition.

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Acknowledgements

We are grateful to FAPEMIG, FAPESP, CAPES and CNPq for funding part of this work. This work has been supported by the Brazilian Synchrotron Light Source (LNLS) under proposal D09B-XRF 7673/08.

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Authors and Affiliations

  1. Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista, CP 355, Araraquara, SP, 14800-900, Brazil

    Hudson W. P. Carvalho, Roberto Bertholdo, Celso V. Santilli & Sandra H. Pulcinelli

  2. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, CEP 05508-000, São Paulo, SP, Brazil

    Ana P. L. Batista

  3. Departamento de Química, Universidade Federal de Lavras, CP 3037, Lavras, MG, 37200-000, Brazil

    Teodorico C. Ramalho

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  1. Hudson W. P. Carvalho
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  2. Ana P. L. Batista
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  3. Roberto Bertholdo
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  4. Celso V. Santilli
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  5. Sandra H. Pulcinelli
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  6. Teodorico C. Ramalho
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Correspondence to Hudson W. P. Carvalho.

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Carvalho, H.W.P., Batista, A.P.L., Bertholdo, R. et al. Photocatalyst TiO2–Co: the effect of doping depth profile on methylene blue degradation. J Mater Sci 45, 5698–5703 (2010). https://doi.org/10.1007/s10853-010-4639-5

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  • DOI: https://doi.org/10.1007/s10853-010-4639-5

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