RT journal article
T1 Oxidation of an Azo-Dye via the Photo-Fenton Process under Heterogeneous and Homogeneous Conditions
A1 Riaza-Frutos, A.
A1 Egea-Corbacho Lopera, Agata
A1 Manzano Quiñones, Manuel Alejandro
A1 Quiroga Alonso, José María
A2 Tecnologías del Medio Ambiente
K1 oxidation
K1 photo-Fenton
K1 wastewater
K1 azo-dye
AB In today’s industries, a diversity of processes give rise to increasing numbers of nonbiodegradablecompounds that need to be degraded totally or transformed to other less toxic and/ormore biodegradable compounds, before their discharge into the environment. One such compoundchosen for this study is Orange II, a representative azo-dye that is widely used and easy to monitorin its degradation. The photo-Fenton process was used under heterogeneous and homogeneousconditions to study several different variables. At the end of this research, a comparative studywas carried out between the two types of catalysis. It was observed that better results in primarydegradation and mineralization were provided by homogeneous catalysis. The photo-Fenton processtakes place effectively under heterogeneous and homogeneous catalysis conditions. The process ismuch faster under homogeneous conditions than under heterogeneous conditions (99.9 and 24%after 90 min, respectively, especially when only 2 ppm of iron in solution is required). Mineralizationwas observed through total organic carbon, through the variable C/Co as a function of time duringphoto-Fenton and Orange II degradation, and the data obtained for the final oxidation capacity are inagreement with the experimental percentages of mineralization. A linear fit was observed using theChan–Chu kinetic model for heterogeneous and homogeneous catalysis. For heterogeneous catalysis,56% mineralization was reached whereas the model predicts 63%. Regarding homogeneous catalysis,according to the model, 100% mineralization is reached because (1/ ) takes a value greater than 1since the model calculates it on infinite time.
PB MDPI
SN 2073-4441
YR 2023
FD 2023-05-06
LK http://hdl.handle.net/10498/32131
UL http://hdl.handle.net/10498/32131
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026