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Pt film electrodes prepared by the Pechini method for electrochemical decolourisation of Reactive Orange 16

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Abstract

Electrochemical decolourisation of Reactive Orange 16 was carried out in an electrochemical flow-cell, using as working electrodes a Pt thin film deposited on a Ti substrate (Pt/Ti) prepared by the Pechini method and a pure platinum (Pt) foil. Using the Pt/Ti electrodes better results for dye decolourisation were obtained under milder conditions than those used for pure Pt. For the Pt electrode, colour removal of 93 % (λ = 493 nm) was obtained after 60 min, at 2.2 V vs. RHE, using 0.017 mol L−1 NaCl + 0.5 mol L−1 H2SO4 solution. For the Pt/Ti electrode there was better colour removal, 98%, than for the Pt electrode. Moreover, we used 0.017 mol L−1 NaCl solution and the applied potential was 1.8 V. Under this condition after 15 min of electrolysis, more than 80% of colour was removed. The rate reaction constant, assuming a first order reaction, was 0.024 min−1 and 0.069 min−1, for Pt and Pt/Ti electrodes, respectively.

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Acknowledgements

The authors gratefully acknowledge CNPq (grant number: 141464/2005-4) and FAPESP (grant number: 04/09588-1, 03/09933-8 and 05/04708-1)

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Authors and Affiliations

  1. Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, CEP 13560-970, São Carlos, SP, Brazil

    L. Gomes, G. R. P. Malpass & A. J. Motheo

  2. NANOFAEL—LIEC—DQ—UFSCar, C.P. 676, CEP 13565-905, São Carlos, SP, Brazil

    R. G. Freitas & E. C. Pereira

Authors
  1. L. Gomes
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  2. R. G. Freitas
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  3. G. R. P. Malpass
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  4. E. C. Pereira
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  5. A. J. Motheo
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Correspondence to A. J. Motheo.

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Gomes, L., Freitas, R.G., Malpass, G.R.P. et al. Pt film electrodes prepared by the Pechini method for electrochemical decolourisation of Reactive Orange 16. J Appl Electrochem 39, 117–121 (2009). https://doi.org/10.1007/s10800-008-9649-5

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  • DOI: https://doi.org/10.1007/s10800-008-9649-5

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