Comparison of Diuron degradation by direct UV photolysis and advanced oxidation processes

• Published in: Journal of environmental management Vol. 88; no. 4; pp. 1505 - 1512
• Main Authors: Djebbar, Kamel Ezzine, Zertal, Abdennour, Debbache, Nadra, Sehili, Tahar
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-09-2008; Elsevier; Academic Press Ltd
• Subjects: [rad]OH; Animal, plant and microbial ecology; Applied ecology; Aqueous solution; batch reactors; batch systems; Biological and medical sciences; breakdown pathways; Chemical compounds; chemical degradation; chemical reactions; Chemical reactors; Comparative analysis; Conservation, protection and management of environment and wildlife; Diuron; Diuron - chemistry; Fe(III); Ferric Compounds - chemistry; Ferrioxalate; free radicals; Fundamental and applied biological sciences. Psychology; General aspects; Herbicides - chemistry; Hydrogen peroxide; Hydrogen Peroxide - chemistry; hydroxyl radical; mineralization; Oxidation; Oxidation-Reduction; photolysis; Ultraviolet radiation; Ultraviolet Rays; UV; Hydrogen peroxide; Diuron; OH; Fe(III); Aqueous solution; Ferrioxalate; OH: UV; Pesticides; Environmental management; Herbicide; Degradation; Ultraviolet radiation; Photolysis; Ureas; Oxidation
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2007.07.034

The rates of Diuron elimination by some advanced oxidation processes (AOPs) such as Fe(III)/UV, Ferrioxalate/UV, Fe(III)/H
2O
2/UV, Ferrioxalate/UV/H
2O
2 and Fe(III)/H
2O
2 have been compared. Experiments have been conducted at pH=2.3±0.1 with a batch reactor equipped with a low-pressure mercury lamp emitting mainly at 253.7
nm. Data obtained under the following experimental conditions ([H
2O
2]
0=10
−3
M, [Diuron]
0=5×10
−5
M and [Fe(III)]
0=10
−3
M) have shown that rates of Diuron oxidation were higher with the systems Fe(III)/H
2O
2/UV and Ferrioxalate/UV/H
2O
2 than with Fe(III)/UV and Fe(III)/H
2O
2. On the other hand, Fe(III)/UV was found to be very efficient in mineralization of Diuron solution in comparison to direct UV photolysis. The experimental results showed that radical
OH is the major pathway in the process of Diuron degradation.