Carrier, Marion; Besson, M.; Guillard, C. and Gonze, E. (2009) Removal of herbicide diuron and thermal degradation products under Catalytic Wet Air Oxidation conditions. Applied Catalysis B: Environmental, pp. 275-283.
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Document available online at: https://hal.archives-ouvertes.fr/hal-00431172
Summary
The Catalytic Wet Air Oxidation (CWAO) of diuron (N-(3,4-dichlorophenyl)-N,N-dimethylurea), a herbicide widely used in agriculture and belonging to the phenylurea family, has been investigated in aqueous solution in the presence of a Ru/TiO2 catalystat 140-180 degrees C and 5 MPa total air pressure. Diuron and Total Organic Carbon (TOC) have been analyzed. Some reaction products were identified by LC-ES/MS, and the amount of the inorganic ions and organic products generated during the process have been measured. Thermal degradation is the main initial process yielding mainly 3.4-dichloroaniline (DCA) and dimethylamine (DMA). Further oxidations lead to ring opening and smaller organic molecules from DCA, but the DMA fragment was more difficult to eliminate. Reactions between DCA and carboxylic acids conducted to the formation of condensation products. On the other hand, dechlorination was fast and complete. The work points out that CWAO over Ru supported catalysts may not a viable technique for degradation of diluted aqueous solutions of diuron. The mineralization is incomplete compared to other Advanced Oxidation Processes, and a possible leaching of the metal by the amines formed by thermal degradation of diuron may be critical. (C) 2009 Elsevier B.V. All rights reserved.
EPrint Type: | Journal paper |
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Subjects: | "Organics" in general |
Research affiliation: | France > INRAe - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement |
ISSN: | ISSN: 0926-3373 |
DOI: | 10.1016/j.apcatb.2009.05.036 |
Project ID: | HAL-INRAe |
Deposited By: | PENVERN, Servane |
ID Code: | 41836 |
Deposited On: | 12 Aug 2021 10:37 |
Last Modified: | 12 Aug 2021 10:37 |
Document Language: | English |
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