Photocatalytic degradation of herbicide Bentazone in aqueous suspension of TiO2: mineralization, identification of intermediates and reaction pathways
DSpace at IIT Bombay
View Archive InfoField | Value | |
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
|
|