Comparison of Diuron degradation by direct UV photolysis and advanced oxidation processes.
The rates of Diuron elimination by some advanced oxidation processes (AOPs) such as Fe(III)/UV, Ferrioxalate/UV, Fe(III)/H(2)O(2)/UV, Ferrioxalate/UV/H(2)O(2) and Fe(III)/H(2)O(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(2)O(2)](0)=10(-3)M, [Diuron](0)=5 x 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(2)O(2)/UV and Ferrioxalate/UV/H(2)O(2) than with Fe(III)/UV and Fe(III)/H(2)O(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.
Djebbar
Kamel Ezzine
KE
Laboratoire des Sciences et Technologies de l'Environnement, Université MENTOURI Constantine, Chaabat Errassas, 25000 Constantine, Algeria. kedjebbar@Yahoo.fr
Zertal
Abdennour
A
Debbache
Nadra
N
Sehili
Tahar
T
D004237:Diuron / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D006540:Herbicides / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D010084:Oxidation-Reduction; D014466:Ultraviolet Rays
D005290:Ferric Compounds; D006540:Herbicides; D004237:Diuron; D006861:Hydrogen Peroxide