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UV induced degradation of herbicide 2,4-D: kinetics, mechanism and effect of various conditions on the degradation

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Title UV induced degradation of herbicide 2,4-D: kinetics, mechanism and effect of various conditions on the degradation
 
Creator KUNDU, SANGHAMITRA
PAL, ANJALI
DIKSHIT, ANIL KUMAR
 
Subject chemical reactors
irradiation
kinetics
photochemical reactions
reaction kinetics
ultraviolet radiation
 
Description The degradation of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) under UV light was studied under various conditions. A photoreactor was used for the photochemical reaction. Calibration curves for 2,4-D were generated at two different absorption maxima (230 and 283 nm). The effects of various parameters such as light intensity, exposure time, various solvents (10% methanol and 10% acetonitrile) and micellar media (cationic and anionic) and the effects of some other parameters such as O2, wavelength of light, pH, other commonly occurring ions (e.g. Cl−, SO42−, Ca2+/Mg2+, Fe3+, NO3−) were studied. The percentage of degradation of 2,4-D was achieved up to 81% in simple aqueous medium. But in cetyltrimethylammonium chloride (CTAC, a cationic micelle) the percent degradation can even be further increased. The percent degradation of 2,4-D using solar irradiation under similar conditions as that applied for the photoreaction using the photoreactor was compared. Using the solar light the degradation was very negligible. The reaction in general follows zero-order kinetics. But in CTAC micelle the reaction follows first-order kinetics.
 
Publisher Elsevier
 
Date 2009-06-05T05:00:21Z
2011-12-08T07:45:39Z
2011-12-26T13:02:25Z
2011-12-27T05:48:37Z
2009-06-05T05:00:21Z
2011-12-08T07:45:39Z
2011-12-26T13:02:25Z
2011-12-27T05:48:37Z
2005
 
Type Article
 
Identifier Separation and Purification Technology 44(2), 121-129
1383-5866
10.1016/j.seppur.2004.12.008
http://hdl.handle.net/10054/1433
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1433
 
Language en