Journal
CHEMOSPHERE
Volume 63, Issue 10, Pages 1718-1727Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2005.09.034
Keywords
photo-Fenton reaction; monuron; mu-LC-MS; mu-LC-UV; TiO2 photocatalysis; chlorophenylurea herbicides
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The photodegradation of monuron (3-(4-chlorophenyl)-1,1-dimethylurea) in aqueous solutions under simulated solar irradiation has been conducted by different advanced oxidation processes (UV/H2O2, UV/H2O2/Fe2+, UV/H2O2/TiO2, UV/TiO2, dark H2O2/Fe3+). The degradation rates were always higher for the homogeneous catalysis in photo-Fenton reactions (UV/H2O2/Fe2+) compared to the heterogeneous photocatalytic systems (TiO2/UV and UV/H2O2/TiO2). Optimal concentrations of Fe2+ and H2O2 for the abatement of the herbicide in the photo-Fenton system were found to be 1 mM Fe(II) and 10 mM H2O2. Several intermediary products were identified using large volume injection micro-liquid chromatography with UV detection (mu-LC-UV), mu-LC-MS and GC-MS techniques and a degradation mechanism has been proposed. (c) 2005 Elsevier Ltd. All rights reserved.
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