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Semiconductor Mediated Photocatalysed Reaction of Two Selected Organic Compounds in Aqueous Suspensions of Titanium Dioxide

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Title Semiconductor Mediated Photocatalysed Reaction of Two Selected Organic Compounds in Aqueous Suspensions of Titanium Dioxide
 
Creator MIR, NA
HAQUE, MM
KHAN, A
UMAR, K
MUNEER, M
VIJAYALAKSHMI, S
 
Subject Chloramben
Cyanazine
Titanium Dioxide
Semiconductor
Photomineralization
Photodegradation
PESTICIDE DERIVATIVES
DEGRADATION
HERBICIDES
WATER
CYANAZINE
 
Description Semiconductor mediated hydrogen peroxide-assisted photocatalytic degradation of two selected pesticide compounds, chloramben (1) and cyanazine (2) has been investigated in aqueous suspensions under a variety of conditions. The degradation was studied by monitoring the depletion in total organic carbon (TOC) content and decrease in substrate concentration as a function of irradiation time. The degradation kinetics of pesticide compounds 1 and 2 were 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. GC-MS analysis of the irradiated mixture of pesticide compounds 1 and 2 indicate 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 NIST library. Plausible mechanism for the formation of different products involving the reaction of hydroxyl and super oxide radical anions with 1 and 2 has been proposed.
 
Publisher SCIENCE & TECHNOLOGY NETWORK INC
 
Date 2014-10-15T15:43:57Z
2014-10-15T15:43:57Z
2012
 
Type Article
 
Identifier JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES, 15(2)380-391
http://dspace.library.iitb.ac.in/jspui/handle/100/15184
 
Language en