Fe(II)-Based GDE Electrodes for the Demineralization of Methylene Blue Dye

  • S. Z. J. ZaidiEmail author
  • E. Hurter
  • F. C. Walsh
  • C. Ponce de León
Open Access
Research Article - Chemical Engineering


This paper describes the removal of methylene blue (MB) dye using [Fe(II)]-based gas diffusion electrodes (GDEs). GDEs were developed by rolling carbon black and polytetrafluoroethylene as a conductive layer for efficient oxygen reduction reaction, with an [Fe(II)] ink layer (\(5\,\hbox {mg cm}^{-2}\) loading) to conduct Fenton chemistry. The GDEs demonstrated the ability to remove the colour and mineralize MB dye in an undivided, three-electrode cell. Colour removal achieved 99% in a \(150\,\hbox {cm}^{3}\) solution containing 100 ppm of MB dye at constant potential of \({-}\) 1.0 V vs. \(\hbox {Hg/HgSO}_{4}\) in 240 min. The kinetics of the MB decolouration showed pseudo-first-order batch kinetics. The results demonstrated that a GDE containing immobilized Fe(II) ions appears to be a viable option for the environmental remediation of organic dyes in wastewater by an anodic Fenton oxidation.


Demineralization Electro-Fenton Fe(II) Gas diffusion electrodes Methylene blue dye 


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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • S. Z. J. Zaidi
    • 1
    Email author
  • E. Hurter
    • 1
  • F. C. Walsh
    • 1
  • C. Ponce de León
    • 1
  1. 1.Electrochemical Engineering Laboratory, Faculty of Engineering and Environment, Engineering SciencesUniversity of SouthamptonHighfield, SouthamptonUK

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