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Title: | Monuron photodegradation products in aqueous solution [articol] |
Authors: | Bobu, M. Lundanes, E. Siminiceanu, Ilie |
Subjects: | Protecția mediului -- Fotodegradare -- Articol Monuron μ-LC-MS μ-LC-UV Photocatalysis Degradation products |
Issue Date: | 2008 |
Publisher: | Timişoara : Editura Politehnica |
Citation: | Bobu, M.. Monuron photodegradation products in aqueous solution . Timişoara: Editura Politehnica, 2008 |
Series/Report no.: | Seria chimie şi ingineria mediului,;Tom 53(67), fasc. 1-2 (2008) |
Abstract: | The photodegradation of monuron (3-(4-chlorophenyl)-1, 1-dimethylurea) in aqueous solutions under simulated solar irradiation has been conducted in this study by different advanced oxidation processes (UV/H2O2, UV/H2O2/Fe2+,UV/H2O2/TiO2, UV/TiO2). The degradation rates were always higher for the homogenous catalysis in photo-Fenton reactions (UV/H2O2/Fe2+) when compared with 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.Several intermediary products were identified using large volume injection micro-liquid chromatography with UVdetection, LC-MS and GC-MS techniques and from the analytical data, a degradation mechanism was proposed. The degradation mechanism of monuron is initiated by the attack of hydroxyl radicals at the N-terminal group and consists of two sequential N-dealkylations followed by hydrolysis to an aniline derivate (4-chloroaniline). Further oxidations leads to ring opening and smaller organic molecules, easier to oxidize. |
URI: | http://primo.upt.ro:1701/primo-explore/search?query=any,contains,Monuron%20photodegradation%20products%20in%20aqueous%20solution&tab=default_tab&search_scope=40TUT&vid=40TUT_V1&lang=ro_RO&offset=0 Link Primo |
Appears in Collections: | Articole științifice/Scientific articles |
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BUPT_ART_Bobu_f.pdf | 412.82 kB | Adobe PDF | View/Open |
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