Kinetics study of imidacloprid degradation by ozonation

Xicheng Wang, Naiyun Gao, Dongmei Feng, Yang Deng, Chao Zhou

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Kinetics tests in ozonation of imidacloprid in water were performed. The kinetics for reactions between imidacloprid with molecular ozone and hydroxyl radicals were investigated. An indirect competition method was used to determine the second-orderrate constant for hydroxyl radicaloxidationof imidacloprid (k·OH-Imid) in the presence of p-chlorobenzoic acid(pCBA) as the reference compound. The results demonstrate that the ozonation is an effective method to remove imidacloprid from water. The pseudo first-order rate constants of imidacloprid degradation increases from 0.079 min-1 to 0.326 min-1 with the increase of pH from 6.0 to 8.7 at an average ozone dose of 1.15 mg/L. When the alkalinity (CaCO3) increases from 0 mg/L to 250 mg/L at pH 7.0 and an average ozone dose of 1.41 mg/L, the pseudo first order rate constant decreases from 0.121 to 0.034 min-1. The second-order rate constant ((10.92±0.12) (mol/L)-1∙s-1 for the reaction of imidacloprid and molecular ozone is determined at pH 2.0 and in the presence of 50 mmol/L tert-butyl alcohol. The rate constant is 2.92×109 (mol/L)-1∙s-1 at pH 7.0. The rate constants are estimated to range at 2.65×109-3.79×109 (mol/L)-1∙s-1 at pH 6.0-8.6.

Original languageEnglish
Pages (from-to)3712-3721
Number of pages10
JournalZhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)
Volume45
Issue number10
StatePublished - 1 Jan 2014

Fingerprint

imidacloprid
Ozonization
Rate constants
Ozone
degradation
Degradation
kinetics
ozone
Kinetics
Hydroxyl Radical
Chlorobenzoates
tert-Butyl Alcohol
alkalinity
dosage
Alkalinity
Water
hydroxyl radicals
hydroxyl radical
Alcohols
water

Keywords

  • Hydroxyl radicals
  • Imidacloprid
  • Kinetics
  • Ozone

Cite this

@article{e4d932f31a8949e382445d11ad694a66,
title = "Kinetics study of imidacloprid degradation by ozonation",
abstract = "Kinetics tests in ozonation of imidacloprid in water were performed. The kinetics for reactions between imidacloprid with molecular ozone and hydroxyl radicals were investigated. An indirect competition method was used to determine the second-orderrate constant for hydroxyl radicaloxidationof imidacloprid (k·OH-Imid) in the presence of p-chlorobenzoic acid(pCBA) as the reference compound. The results demonstrate that the ozonation is an effective method to remove imidacloprid from water. The pseudo first-order rate constants of imidacloprid degradation increases from 0.079 min-1 to 0.326 min-1 with the increase of pH from 6.0 to 8.7 at an average ozone dose of 1.15 mg/L. When the alkalinity (CaCO3) increases from 0 mg/L to 250 mg/L at pH 7.0 and an average ozone dose of 1.41 mg/L, the pseudo first order rate constant decreases from 0.121 to 0.034 min-1. The second-order rate constant ((10.92±0.12) (mol/L)-1∙s-1 for the reaction of imidacloprid and molecular ozone is determined at pH 2.0 and in the presence of 50 mmol/L tert-butyl alcohol. The rate constant is 2.92×109 (mol/L)-1∙s-1 at pH 7.0. The rate constants are estimated to range at 2.65×109-3.79×109 (mol/L)-1∙s-1 at pH 6.0-8.6.",
keywords = "Hydroxyl radicals, Imidacloprid, Kinetics, Ozone",
author = "Xicheng Wang and Naiyun Gao and Dongmei Feng and Yang Deng and Chao Zhou",
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journal = "Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)",
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publisher = "Central South University of Technology",
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}

Kinetics study of imidacloprid degradation by ozonation. / Wang, Xicheng; Gao, Naiyun; Feng, Dongmei; Deng, Yang; Zhou, Chao.

In: Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology), Vol. 45, No. 10, 01.01.2014, p. 3712-3721.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Kinetics study of imidacloprid degradation by ozonation

AU - Wang, Xicheng

AU - Gao, Naiyun

AU - Feng, Dongmei

AU - Deng, Yang

AU - Zhou, Chao

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Kinetics tests in ozonation of imidacloprid in water were performed. The kinetics for reactions between imidacloprid with molecular ozone and hydroxyl radicals were investigated. An indirect competition method was used to determine the second-orderrate constant for hydroxyl radicaloxidationof imidacloprid (k·OH-Imid) in the presence of p-chlorobenzoic acid(pCBA) as the reference compound. The results demonstrate that the ozonation is an effective method to remove imidacloprid from water. The pseudo first-order rate constants of imidacloprid degradation increases from 0.079 min-1 to 0.326 min-1 with the increase of pH from 6.0 to 8.7 at an average ozone dose of 1.15 mg/L. When the alkalinity (CaCO3) increases from 0 mg/L to 250 mg/L at pH 7.0 and an average ozone dose of 1.41 mg/L, the pseudo first order rate constant decreases from 0.121 to 0.034 min-1. The second-order rate constant ((10.92±0.12) (mol/L)-1∙s-1 for the reaction of imidacloprid and molecular ozone is determined at pH 2.0 and in the presence of 50 mmol/L tert-butyl alcohol. The rate constant is 2.92×109 (mol/L)-1∙s-1 at pH 7.0. The rate constants are estimated to range at 2.65×109-3.79×109 (mol/L)-1∙s-1 at pH 6.0-8.6.

AB - Kinetics tests in ozonation of imidacloprid in water were performed. The kinetics for reactions between imidacloprid with molecular ozone and hydroxyl radicals were investigated. An indirect competition method was used to determine the second-orderrate constant for hydroxyl radicaloxidationof imidacloprid (k·OH-Imid) in the presence of p-chlorobenzoic acid(pCBA) as the reference compound. The results demonstrate that the ozonation is an effective method to remove imidacloprid from water. The pseudo first-order rate constants of imidacloprid degradation increases from 0.079 min-1 to 0.326 min-1 with the increase of pH from 6.0 to 8.7 at an average ozone dose of 1.15 mg/L. When the alkalinity (CaCO3) increases from 0 mg/L to 250 mg/L at pH 7.0 and an average ozone dose of 1.41 mg/L, the pseudo first order rate constant decreases from 0.121 to 0.034 min-1. The second-order rate constant ((10.92±0.12) (mol/L)-1∙s-1 for the reaction of imidacloprid and molecular ozone is determined at pH 2.0 and in the presence of 50 mmol/L tert-butyl alcohol. The rate constant is 2.92×109 (mol/L)-1∙s-1 at pH 7.0. The rate constants are estimated to range at 2.65×109-3.79×109 (mol/L)-1∙s-1 at pH 6.0-8.6.

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JO - Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

JF - Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

SN - 1672-7207

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