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

M. Shestakova, John Graves, M. Sitarz, M. Sillanpää

    Research output: Contribution to journalArticle

    9 Citations (Scopus)
    45 Downloads (Pure)

    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.
    Original languageEnglish
    Pages (from-to)349-358
    Number of pages9
    JournalJournal of Applied Electrochemistry
    Volume46
    Issue number3
    Early online date11 Jan 2016
    DOIs
    Publication statusPublished - Mar 2016

    Bibliographical note

    The final publication is available at Springer via http://dx.doi.org/10.1007/s10800-016-0925-5

    Keywords

    • Electrocatalysis
    • Electrolysis
    • Ti/Ta2O5–SnO2 electrodes
    • Methylene blue

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