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Optimization of Ti/Ta2O5–SnO2 electrodes and reaction parameters for electrocatalytic oxidation of methylene blue

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Abstract

Among existing water treatment methods for organic-containing wastewaters, advanced oxidation process, particularly electrocatalytic oxidation, is a technique allowing to reach high degradation and mineralization efficiencies. Electrodes tested for use in electrocatalytic oxidation processes contain either expensive or platinum/group metals such as Pt-, Ru-, Ir-, Pd-, or boron-doped diamond and Sb and Pb compounds which are toxic for the environment. Thereby, there is a need for environmentally friendly and less expensive electrodes. The objectives of this research were to optimize annealing temperature of Ti/Ta2O5–SnO2 electrodes, establish the working media for organic compound oxidation processes as well as check degradation, mineralization and current efficiencies for methylene blue dye oxidation. Decolorisation efficiency of 95 % was achieved in 2 h at pH = 6.5. Neutral media showed also higher efficiency towards COD decrease which was equal to 85 % after 2 h of electrolysis. The lowest energy consumption of 7.7 kWh m−3 required for 100 % decolorisation was observed for the electrodes annealed at 550 °C at pH = 2. The highest current efficiency of 10.1 % attributed to 80 % of COD reduction was obtained for the electrode annealed at 550 °C at pH = 6.5. The optimization data allow further extrapolating of electrocatalytic oxidation process on Ti/Ta2O5–SnO2 electrodes to pilot scale.

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Acknowledgments

This work was supported by Maj and Tor Nessling Foundation.

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Authors and Affiliations

  1. Laboratory of Green Chemistry, Faculty of Technology, Lappeenranta University of Technology, Sammonkatu 12, 50130, Mikkeli, Finland

    Marina Shestakova & Mika Sillanpää

  2. Functional Materials Applied Research Group, Coventry University, Priory Street, Coventry, CV1 5FB, UK

    John Graves

  3. Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Av. Mickiewicza 30, 30-059, Cracow, Poland

    Maciek Sitarz

Authors
  1. Marina Shestakova
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  2. John Graves
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  3. Maciek Sitarz
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  4. Mika Sillanpää
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Correspondence to Marina Shestakova.

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Shestakova, M., Graves, J., Sitarz, M. et al. Optimization of Ti/Ta2O5–SnO2 electrodes and reaction parameters for electrocatalytic oxidation of methylene blue. J Appl Electrochem 46, 349–358 (2016). https://doi.org/10.1007/s10800-016-0925-5

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  • DOI: https://doi.org/10.1007/s10800-016-0925-5

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