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Photocatalytic degradation of herbicide Bentazone in aqueous suspension of TiO2: mineralization, identification of intermediates and reaction pathways

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Title Photocatalytic degradation of herbicide Bentazone in aqueous suspension of TiO2: mineralization, identification of intermediates and reaction pathways
 
Creator MIR, NA
HAQUE, MM
KHAN, A
MUNEER, M
VIJAYALAKSHMI, S
 
Subject Bentazone
GC-MS
H2O2
photocatalytic mineralization
TiO2
CONTAINING BENZENE-DERIVATIVES
TITANIUM-DIOXIDE
EMERGING CONTAMINANTS
SOLAR PHOTOCATALYSIS
WATER DETOXIFICATION
NITROGEN
PHOTODEGRADATION
OXIDATION
REMOVAL
UV/H2O2
 
Description Semiconductor-mediated hydrogen peroxide-assisted photocatalytic degradation of a selected herbicide, Bentazone (1) has been investigated in aqueous suspensions of TiO2 under a variety of conditions. The degradation was studied by monitoring the depletion in total organic carbon content as a function of irradiation time. The degradation kinetics was investigated under different conditions such as type of TiO2 (Anatase/Anatase-Rutile mixture), reaction pH, catalyst dosage and hydrogen peroxide (H2O2) concentration. The degradation rates were found to be strongly influenced by all the above parameters. Titanium dioxide Degussa P25 was found to be more efficient as compared with other two commercially available TiO2 powders like Hombikat UV100 and PC500 from Millennium Inorganic Chemicals. Gas Chromatography-Mass Spectrometry (GC-MS) analysis of the irradiated mixture of Bentazone (1) indicates the formation of several intermediate products which have been characterized on the basis of molecular ion/mass fragmentation pattern and also on comparison with the National Institute of Standards and Technology (NIST) library. Plausible mechanism for the formation of different products during photocatalytic treatment of Bentazone in the presence of TiO2 has been proposed. The use of H2O2 substantially increased the efficiency of TiO2 photocatalytic degradation.
 
Publisher TAYLOR & FRANCIS LTD
 
Date 2014-12-28T12:19:55Z
2014-12-28T12:19:55Z
2014
 
Type Article
 
Identifier ENVIRONMENTAL TECHNOLOGY, 35(4)407-415
0959-3330
1479-487X
http://dx.doi.org/10.1080/09593330.2013.829872
http://dspace.library.iitb.ac.in/jspui/handle/100/16491
 
Language English