Photochemical degradation of carbofuran and elucidation of removal mechanism

Li An Lu; Ying Shih Ma; Mathava Kumar; Jih-Gaw Lin

doi:10.1016/j.cej.2010.10.045

Photochemical degradation of carbofuran and elucidation of removal mechanism

Li An Lu, Ying Shih Ma, Mathava Kumar, Jih-Gaw Lin^*

^*Corresponding author for this work

Institute of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Carbofuran removal by the photo-Fenton reaction was investigated under various H₂O₂ dosage rate (0-6mgL^-1min^-1) and Fe³⁺ dosage (5-50mgL^-1). The outcomes demonstrate that the photo-Fenton reaction was influenced by both the factors. An initial carbofuran concentration of 50mgL^-1 was completely degraded within 30min, and 93% dissolved organic carbon (DOC) removal was observed after 120min of treatment at initial pH 3, H₂O₂ dosage rate of 4mgL^-1min^-1 and Fe³⁺ dosage of 35 and 50mgL^-1. However, no significant improvement in the carbofuran removal was observed when the H₂O₂ dosage rate and Fe³⁺ dosage were increased beyond 4mgL^-1min^-1 and 35mgL^-1, respectively. The carbofuran removal was fitted using the pseudo-first order reaction model and the highest apparent rate constant of 10.5×10^-2min^-1 was obtained. Five major carbofuran intermediates were identified, which indicate that C-O bond of the carbamate group and 3-C position of the furan ring were oxidized as a result of the photo-Fenton reaction.

Original language	English
Pages (from-to)	150-156
Number of pages	7
Journal	Chemical Engineering Journal
Volume	166
Issue number	1
DOIs	https://doi.org/10.1016/j.cej.2010.10.045
State	Published - 1 Jan 2011

Keywords

Carbofuran
Dissolved organic carbon
Intermediates
Photo-Fenton reaction
Pseudo-first order reaction model

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10.1016/j.cej.2010.10.045

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title = "Photochemical degradation of carbofuran and elucidation of removal mechanism",

abstract = "Carbofuran removal by the photo-Fenton reaction was investigated under various H2O2 dosage rate (0-6mgL-1min-1) and Fe3+ dosage (5-50mgL-1). The outcomes demonstrate that the photo-Fenton reaction was influenced by both the factors. An initial carbofuran concentration of 50mgL-1 was completely degraded within 30min, and 93% dissolved organic carbon (DOC) removal was observed after 120min of treatment at initial pH 3, H2O2 dosage rate of 4mgL-1min-1 and Fe3+ dosage of 35 and 50mgL-1. However, no significant improvement in the carbofuran removal was observed when the H2O2 dosage rate and Fe3+ dosage were increased beyond 4mgL-1min-1 and 35mgL-1, respectively. The carbofuran removal was fitted using the pseudo-first order reaction model and the highest apparent rate constant of 10.5×10-2min-1 was obtained. Five major carbofuran intermediates were identified, which indicate that C-O bond of the carbamate group and 3-C position of the furan ring were oxidized as a result of the photo-Fenton reaction.",

keywords = "Carbofuran, Dissolved organic carbon, Intermediates, Photo-Fenton reaction, Pseudo-first order reaction model",

author = "Lu, {Li An} and Ma, {Ying Shih} and Mathava Kumar and Jih-Gaw Lin",

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AU - Lu, Li An

AU - Ma, Ying Shih

AU - Kumar, Mathava

AU - Lin, Jih-Gaw

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Y1 - 2011/1/1

N2 - Carbofuran removal by the photo-Fenton reaction was investigated under various H2O2 dosage rate (0-6mgL-1min-1) and Fe3+ dosage (5-50mgL-1). The outcomes demonstrate that the photo-Fenton reaction was influenced by both the factors. An initial carbofuran concentration of 50mgL-1 was completely degraded within 30min, and 93% dissolved organic carbon (DOC) removal was observed after 120min of treatment at initial pH 3, H2O2 dosage rate of 4mgL-1min-1 and Fe3+ dosage of 35 and 50mgL-1. However, no significant improvement in the carbofuran removal was observed when the H2O2 dosage rate and Fe3+ dosage were increased beyond 4mgL-1min-1 and 35mgL-1, respectively. The carbofuran removal was fitted using the pseudo-first order reaction model and the highest apparent rate constant of 10.5×10-2min-1 was obtained. Five major carbofuran intermediates were identified, which indicate that C-O bond of the carbamate group and 3-C position of the furan ring were oxidized as a result of the photo-Fenton reaction.

AB - Carbofuran removal by the photo-Fenton reaction was investigated under various H2O2 dosage rate (0-6mgL-1min-1) and Fe3+ dosage (5-50mgL-1). The outcomes demonstrate that the photo-Fenton reaction was influenced by both the factors. An initial carbofuran concentration of 50mgL-1 was completely degraded within 30min, and 93% dissolved organic carbon (DOC) removal was observed after 120min of treatment at initial pH 3, H2O2 dosage rate of 4mgL-1min-1 and Fe3+ dosage of 35 and 50mgL-1. However, no significant improvement in the carbofuran removal was observed when the H2O2 dosage rate and Fe3+ dosage were increased beyond 4mgL-1min-1 and 35mgL-1, respectively. The carbofuran removal was fitted using the pseudo-first order reaction model and the highest apparent rate constant of 10.5×10-2min-1 was obtained. Five major carbofuran intermediates were identified, which indicate that C-O bond of the carbamate group and 3-C position of the furan ring were oxidized as a result of the photo-Fenton reaction.

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KW - Dissolved organic carbon

KW - Intermediates

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KW - Pseudo-first order reaction model

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Photochemical degradation of carbofuran and elucidation of removal mechanism

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Keywords

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