Removal of Basic Blue 9 Dye by Hydrogen Peroxide Activated by Electrogenerated Fe2+/Fe3+ and Simultaneous Production of Hydrogen


Electrochemical techniques were used to oxidize organic pollutants by Fenton process using a mix of H2O2 and ferrous ions at a parallel plate reactor. The first stage was to build a micro scale reactor comprising two compartments, cathode and anode, separated by a membrane (Nafion-117). Each compartment has inlets and outlets to allow the flow of fluids (10 Lmin-1). The function of the reactor is to oxidize organic pollutants as well as to produce H2. Hydrogen is electrogenerated in the catholyte by the reduction of protons on a carbon steel cathode in acidic medium (0.05 M H2SO4). At the same time, a mixture of Fe2+/Fe3+ ions is produced in the anolyte (0.05 M Na2SO4, pH ≈ 2) by means of the oxidation of a sacrificial electrode made of stainless steel mesh. Fe2+/Fe3+ ions interact with H2O2 to generate strong oxidants which are responsible for oxidizing the organic matter and removing color. A voltage of 1 V was applied between the electrodes and remained constant, while the current observed was approximately 0.06 A. Under these conditions, the activation rate with different H2O2 concentrations (15, 20, 25, 30, 35, 40, 45 and 50 mM) was evaluated. The maximum activation rate (1.3 mM·min-1) was obtained using 30 mM H2O2. Under these conditions, the oxidation of a synthetic industrial effluent (0.615 mM BB9) was performed and the following results were obtained: 95% of this concentration was removed in 5 minutes and 15 mL of H2 was electrogenerated in 30 minutes.

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Bustos-Terrones, Y. , Rojas-Valencia, M. , Álvarez-Gallegos, A. and García, P. (2015) Removal of Basic Blue 9 Dye by Hydrogen Peroxide Activated by Electrogenerated Fe2+/Fe3+ and Simultaneous Production of Hydrogen. Journal of Environmental Protection, 6, 781-791. doi: 10.4236/jep.2015.68071.

Conflicts of Interest

The authors declare no conflicts of interest.


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