Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13419
Title: Effects of combined and sequential addition of dual oxidants (H 2O2/S2O8 2-) on the aqueous carbofuran photodegradation
Authors: Chu, W 
Lau, TK
Fung, SC
Keywords: Advanced oxidation process
Carbofuran
Endocrine disruptor
Mineralization
Photolysis
Issue Date: 2006
Publisher: American Chemical Society
Source: Journal of agricultural and food chemistry, 2006, v. 54, no. 26, p. 10047-10052 How to cite?
Journal: Journal of agricultural and food chemistry 
Abstract: Carbofuran (2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamate) (CBF) is a widely used insecticide. Traditional methods like hydrolysis and direct photolysis cannot remove CBF effectively. In this study, the photodecay of 0.1 mM CBF in UV/H2O2, UV/S2O8 2-, and UV/H2O2/S2O8 2- and sequential addition of a second oxidant were studied under UV light at 254 nm. The degradations of CBF follow pseudo-first-order decay kinetics. Direct photolysis was slow, but the corresponding degradation rate was increased with the addition of hydrogen peroxide (H2O2) or potassium peroxydisulfate (K2S2O8). In the UV/H2O2 reaction, the optimum reaction rate was 0.9841 min-1 at 10 mM H2O2 (pH 7); however, retardation is observed if H2O2 is overdosed. Such retardation is not observed in the UV/S2O8 2- system, but a nonlinear increment of removal efficiency is identified. The UV/H2O2/S2O8 2- process on the other hand shows the best performance in CBF degradation, but it has a less effective mineralization than that of the sole UV/S2O 8 2- reaction.
URI: http://hdl.handle.net/10397/13419
ISSN: 0021-8561
DOI: 10.1021/jf062018k
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