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Mechanism and efficiency of atrazine degradation under combined oxidation processes

Paper ID Volume ID Publish Year Pages File Format Full-Text
48674 46517 2006 8 PDF Available
Title
Mechanism and efficiency of atrazine degradation under combined oxidation processes
Abstract

The mechanism of atrazine degradation in aqueous phase was investigated under sonolysis at 20 kHz, ozonation, photolysis at 254 nm and photocatalysis in the presence of TiO2, employed either separately or in combination. Ozonation and photocatalysis induced atrazine de-alkylation, followed by slower de-chlorination, while direct photolysis at 254 nm produced very efficient de-chlorination. Simultaneous sonolysis had beneficial effects on ozonation and photocatalysis, especially by increasing the rate of photocatalytic de-alkylation, and no effect on the unimolecular photolytic de-chlorination of atrazine. Although complete atrazine mineralization could not be attained, because of the stability of the s-triazine ring toward oxidation, atrazine degradation and overall detoxification, as related to the disappearance of chlorinated by-products, proceeded at the highest rate when photolysis at 254 nm was combined with ozonation.

Keywords
Atrazine degradation; Ozonation; UV irradiation; Photocatalysis; Ultrasound
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 64, Issues 1–2, 18 April 2006, Pages 131–138
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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