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Oxidation of the insecticide dimethoate by Fenton and solar photo-Fenton processes using a lab-scale continuous flow reactor

Desalination and Water Treatment, ISSN: 1944-3986, Vol: 52, Issue: 34, Page: 6784-6791
2014
  • 9
    Citations
  • 0
    Usage
  • 11
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    9
    • Citation Indexes
      9
  • Captures
    11

Article Description

In this study, advanced oxidation processes utilizing Fenton’s and solar photo-Fenton’s reactions were investigated for the degradation of dimethoate, an organophosphorus insecticide extensively applied in agriculture. Effect of Fe 2+, H 2 O 2, pH, and temperature on the degradation of this insecticide was studied. The kinetic rate constants ( k app ) for COD removal were determined. The test results show that the degradation of dimethoate proceeded rapidly at pH value of 3.0. k app enhanced with the increase of initial Fe 2+ concentration and H 2 O 2 dosing rate. However, higher levels of Fe 2+ and H 2 O 2 also inhibited the reaction kinetics. k app decreased with the increase of initial dimethoate concentration, but increased with the increase of temperature. The activation energy for COD removal by Fenton oxidation, derived from the empirical Arrhenius expression, is 21.38 kJ mol −1. A noticeable k app increase (∼50%) was obtained when using the solar photo-Fenton process, which means about 50% gain of H 2 O 2.

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