Electrochemical Peroxodisulfate (PDS) Generation on a Self-Doped TiO2 Nanotube Array Electrode

  • Jiye Kim
    Jiye Kim
    School of Chemical and Biological Engineering, College of Engineering, Institute of Chemical Process, Seoul National University (SNU), Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of Korea
    More by Jiye Kim
  • Changha Lee
    Changha Lee
    School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, Republic of Korea
    More by Changha Lee
  • , and 
  • Jeyong Yoon*
    Jeyong Yoon
    School of Chemical and Biological Engineering, College of Engineering, Institute of Chemical Process, Seoul National University (SNU), Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of Korea
    Asian Institute for Energy, Environment & Sustainability (AIEES), Seoul National University (SNU), Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of Korea
    *Phone: +82-2-880-8941. Fax: +82-2-876-8911. E-mail: [email protected]
    More by Jeyong Yoon
Cite this: Ind. Eng. Chem. Res. 2018, 57, 33, 11465–11471
Publication Date (Web):July 31, 2018
https://doi.org/10.1021/acs.iecr.8b01208
Copyright © 2018 American Chemical Society
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Abstract

Peroxodisulfate (PDS, S2O82–) is one of the strong oxidants (E°[S2O82–/HSO4] = 2.12 VNHE), which is widely used for radical polymerization or wastewater treatment. In electrochemical PDS generation, its efficiency highly depends on the •OH generating electrode materials. A boron-doped diamond (BDD) used in electrochemical PDS generation is very expensive prompting the need for new electrode materials for PDS generation. This study reports the self-doped TiO2 nanotube array electrodes (blue and black TNAs) for PDS generation which are cheap and effective for generating a significant amount of •OH and comparable to BDD electrodes. Blue and black TNA electrodes were excellent for PDS generation exhibiting high current efficiencies for PDS generation (46% and 22%, respectively). Similar to the BDD electrode, it was also confirmed that •OH was the key precursor to the PDS generation on the self-doped TNA electrodes from the linear relationship between the PDS generation rate and •OH generation.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.iecr.8b01208.

  • Effect of electrolyte to KI absorbance at 352 nm (cm–1) on the blue and black TNA electrodes; effect of t-BuOH and MeOH to PDS generation rate on blue TNA; and service lifetime test for the self-doped TNAs with potential-time curves (PDF)

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