Introduction
Advanced Oxidation Processes (AOPs) are characterized by the generation and use of the •OH radical species for treating wastewaters, and among the different AOPs, the Fenton reaction is probably the most popular approach. The Fenton reaction was discovered in 1894 by H. J. Fenton, who reported that low concentrations of iron ions in H2O2 aqueous solutions could effectively promote the oxidation of tartaric acid. Later, in 1934, Haber & Weiss suggested that the ferrous ion was actually promoting the decomposition of H2O2 and thus the formation of the •OH radical species, whose presence was, in fact, the reason for the observed oxidation power of the Fenton mixture [1, 2].
The •OH radical species has many advantages over other common chemicals for the elimination of a wide variety of pollutants in water effluents. As can be seen in Table 1, its oxidation potential is very high (2.8 V), larger than ozone (2.42 V) and than H2O2 (1.78 V) itself. The oxidation kinetics of the .O...
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Godinez, L., Valadez, F.J.R. (2014). Photoelectrochemical Processes, Electro-Fenton Approach for the Treatment of Contaminated Water. In: Kreysa, G., Ota, Ki., Savinell, R.F. (eds) Encyclopedia of Applied Electrochemistry. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6996-5_130
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