Heat-activated persulfate oxidation of diuron in water

Chaoqun Tan, Naiyun Gao, Yang Deng, Na An, Jing Deng

Research output: Contribution to journalArticle

165 Citations (Scopus)

Abstract

Heat-activated persulfate oxidation of diuron, a commonly found herbicide in groundwater, was evaluated in this study. Sulfate radicals SO4- was the principal oxidizing agent responsible for the diuron degradation. The diuron decomposition exhibited a pseudo-first-order kinetics pattern at all the conditions tested. The observed rate constants determined at 50-70°C well fit the Arrhenius equation, yielding an activation energy of 166.7±0.8kJmol-1. Temperature, persulfate dose, initial diuron concentration, pH, and three common groundwater solutes (CO32-,HCO3-, and Cl-), to different degrees, influenced the degradation. Typically, high temperature, high persulfate dose, and low initial diuron concentration increased the decomposition rate of diuron. At the tested pH range of 5.5-8.1, the highest degradation rate (kobs=0.18min-1) occurred at pH 6.3. The three groundwater anions inhibited the diuron decomposition with the following order: CO32->HCO3->Cl- The major oxidation products in this study were C15H15ON3Cl4 (P3, m/z=376.2), C16H16O4N3Cl4 (P4, m/z=420.3), and C17H17O7N3Cl4 (P5, m/z=465.4), different from those produced during hydroxyl radical-induced advanced oxidation. The in situ chemical oxidation (ISCO) technology can be achieved in practice through combination with in situ thermal remediation.

Original languageEnglish
Pages (from-to)294-300
Number of pages7
JournalChemical Engineering Journal
Volume203
DOIs
StatePublished - 1 Sep 2012

Fingerprint

Diuron
diuron
Groundwater
oxidation
Oxidation
Water
Decomposition
Degradation
water
decomposition
Herbicides
degradation
groundwater
Remediation
Rate constants
Negative ions
Activation energy
Temperature
Kinetics
hydroxyl radical

Keywords

  • Degradation products
  • Diuron
  • Heat-activated persulfate
  • Influencing factor
  • Kinetics

Cite this

Tan, Chaoqun ; Gao, Naiyun ; Deng, Yang ; An, Na ; Deng, Jing. / Heat-activated persulfate oxidation of diuron in water. In: Chemical Engineering Journal. 2012 ; Vol. 203. pp. 294-300.
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Heat-activated persulfate oxidation of diuron in water. / Tan, Chaoqun; Gao, Naiyun; Deng, Yang; An, Na; Deng, Jing.

In: Chemical Engineering Journal, Vol. 203, 01.09.2012, p. 294-300.

Research output: Contribution to journalArticle

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AB - Heat-activated persulfate oxidation of diuron, a commonly found herbicide in groundwater, was evaluated in this study. Sulfate radicals SO4- was the principal oxidizing agent responsible for the diuron degradation. The diuron decomposition exhibited a pseudo-first-order kinetics pattern at all the conditions tested. The observed rate constants determined at 50-70°C well fit the Arrhenius equation, yielding an activation energy of 166.7±0.8kJmol-1. Temperature, persulfate dose, initial diuron concentration, pH, and three common groundwater solutes (CO32-,HCO3-, and Cl-), to different degrees, influenced the degradation. Typically, high temperature, high persulfate dose, and low initial diuron concentration increased the decomposition rate of diuron. At the tested pH range of 5.5-8.1, the highest degradation rate (kobs=0.18min-1) occurred at pH 6.3. The three groundwater anions inhibited the diuron decomposition with the following order: CO32->HCO3->Cl- The major oxidation products in this study were C15H15ON3Cl4 (P3, m/z=376.2), C16H16O4N3Cl4 (P4, m/z=420.3), and C17H17O7N3Cl4 (P5, m/z=465.4), different from those produced during hydroxyl radical-induced advanced oxidation. The in situ chemical oxidation (ISCO) technology can be achieved in practice through combination with in situ thermal remediation.

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