Abstract
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.
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05 June 2019
In the original publication, the ‘OH’ radical was incorrectly typeset. It should be in superscript throughout the article. The original article has been corrected.
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The original version of this article was revised: the ‘OH’ radical should be in superscript throughout the article. It has been corrected.
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Zaidi, S.Z.J., Hurter, E., Walsh, F.C. et al. Fe(II)-Based GDE Electrodes for the Demineralization of Methylene Blue Dye. Arab J Sci Eng 44, 5527–5533 (2019). https://doi.org/10.1007/s13369-019-03813-x
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DOI: https://doi.org/10.1007/s13369-019-03813-x