Improving the Fenton process by visible LED irradiation.
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 H2O2dose 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 H2O2amount, 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+/H2O2cycle, 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.
Ingenieria Quimica, Universidad Autonoma de Madrid, Crta. Colmenar km 15, 28049, Madrid, Spain. gema.pliego@uam.es.
Gema
http://orcid.org/0000-0001-5002-9838
G
Pliego
Ingenieria Quimica, Universidad Autonoma de Madrid, Crta. Colmenar km 15, 28049, Madrid, Spain.
Patricia
P
Garcia-Muñoz
Ingenieria Quimica, Universidad Autonoma de Madrid, Crta. Colmenar km 15, 28049, Madrid, Spain.
Juan A
JA
Zazo
Ingenieria Quimica, Universidad Autonoma de Madrid, Crta. Colmenar km 15, 28049, Madrid, Spain.
Jose A
JA
Casas
Ingenieria Quimica, Universidad Autonoma de Madrid, Crta. Colmenar km 15, 28049, Madrid, Spain.
J J
JJ
Rodriguez
D002384:Catalysis; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D008027:Light; D010084:Oxidation-Reduction; D019800:Phenol / Q000737:chemistry*; D010782:Photolysis; D013696:Temperature
D019800:Phenol; D006861:Hydrogen Peroxide
Advanced oxidation processes; Fenton process; Phenol; Visible LED