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Thermogravimetric and UV–vis spectroscopic studies of chromium redox reactions in rutile pigments

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Abstract

In this study undoped and Cr, Sb or Mo doped TiO2 were synthesized by polymeric precursor method and characterized by X-ray diffraction, UV–VIS spectroscopy, infrared spectroscopy and thermogravimetry (TG). The TG curves showed a continuous mass loss assigned to the hydroxyl elimination and Cr6+ reduction. Doped TiO2 samples showed a higher mass loss assigned to water and gas elimination at lower temperatures. In these doped materials a decrease in the anatase–rutile phase transition temperature was observed. After calcination at 1,000 °C, rutile was obtained as a single phase material without the presence of Cr6+.

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Acknowledgements

The authors acknowledge the financial support of CNPq/MCT, PROINFRA/FINEP.

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Authors and Affiliations

  1. Laboratório de Combustíveis e Materiais, Departamento de Química, Universidade Federal da Paraíba, Campus I, João Pessoa, PB, Brazil

    F. T. G. Vieira, Soraia C. Souza, A. L. M. Oliveira, L. E. B. Soledade, A. G. Souza & Iêda M. G. Santos

  2. LSR, Departamento de Engenharia Mecânica/CT, Universidade Federal da Paraíba, Campus I, João Pessoa, PB, Brazil

    S. J. G. Lima

  3. CMDMC-LIEC, Instituto de Química, UNESP, Araraquara, SP, Brazil

    E. Longo

  4. Departamento de Engenharia de Materiais, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil

    C. A. Paskocimas

Authors
  1. F. T. G. Vieira
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  2. Soraia C. Souza
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  3. A. L. M. Oliveira
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  4. S. J. G. Lima
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  5. E. Longo
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  6. C. A. Paskocimas
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  7. L. E. B. Soledade
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  8. A. G. Souza
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  9. Iêda M. G. Santos
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Corresponding author

Correspondence to Iêda M. G. Santos.

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Vieira, F.T.G., Souza, S.C., Oliveira, A.L.M. et al. Thermogravimetric and UV–vis spectroscopic studies of chromium redox reactions in rutile pigments. J Therm Anal Calorim 97, 99–103 (2009). https://doi.org/10.1007/s10973-009-0074-8

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  • DOI: https://doi.org/10.1007/s10973-009-0074-8

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