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.
Highlights
Across the world, one in nine people do not have access to clean water [1]
The dissolved oxygen is electrochemically converted into H2O2 at the carbon surface of the cathode via the oxygen reduction reaction (ORR)
Where E (V) is the applied potential, Io (A) is the current passed during electrochemical reaction, t (h) the electrolysis time, (TOC0) and (TOCf ) related to the total organic carbon (TOC) values at initial and final time of electrolysis, respectively, and V corresponds the electrolyte volume
Summary
One in nine people do not have access to clean water [1]. Possibly aggravated by climate change, population growth has led to water shortages that could adversely affect many major cities across the globe. Sectors of chemical water treatment have looked at the practical use of hydrogen peroxide for water purification and chemical mineralization. Hydrogen peroxide can be produced by using many synthesis techniques including electro-Fenton [5], photo electro-Fenton [6], and solar electro-Fenton [7]. These technologies produce hydrogen peroxide in situ and negate the hazards and costs of handling and transporting bulk hydrogen peroxide. Novel GDE electrodes were prepared by rolling carbon black over a metal current collector, with a layer of Fe(II) chloride salt introduced onto the GDE for the mineralization of methylene blue. Acetone, methylene blue, potassium permanganate were obtained from Fischer scientific and used as received
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