Improving the Fenton process by visible LED irradiation
2016
Pliego, Gema | Garcia-Muñoz, Patricia | Zazo, Juan A. | Casas, Jose A. | Rodriguez, J.J.
The effect of irradiation with visible light-emitting diode (LED) light on the efficiency of Fenton oxidation is investigated using phenol as the target compound (100 mg/L). The H₂O₂ dose and temperature are tested as operating variables with the aim of minimizing consumption of the reagents. At 50 °C, 10 mg/L Fe²⁺, and 60 % of the stoichiometric H₂O₂ amount, phenol was completely oxidized into CO₂, H₂O, and short chain organic acids, with oxalic acid completely degraded. Up to 95 % mineralization was achieved. This high efficiency can be attributed to the effect of LED radiation on the quinones/Fe²⁺/Fe³⁺/H₂O₂ cycle, which significantly increases the reaction rate, as well as on the photodecomposition of the iron complexes formed along the oxidation process, which also enhanced mineralization.
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