Model applications and mechanism study on the degradation of atrazine by Fenton's system

K. H. Chan, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

50 Citations (Scopus)

Abstract

Atrazine (ATZ), 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine, was effectively degraded by hydroxyl radicals that were generated by FeII/H2O2in the Fenton's process. Up to 98% ATZ removal can be achieved in the process if the doses of FeIIand H2O2are selected appropriately. Oxidation capacity of the process was successfully predicted through a kinetic approach with three simple and measurable parameters (i.e., two rate constants and a break point time), which makes the model useful in predicting, controlling and optimizing the degradation of ATZ. In addition, the transformation pathways of ATZ decay was successfully investigated by using a novel technology, liquid chromatography electrospray tandem mass spectrometry (LC/ESI-MS/MS). Ten intermediates were identified in the process. The alkylic-oxidation followed by dealkylation and/or dechlorination-hydroxylation were found to be the major pathways of the decay of ATZ in Fenton's process. All the detected intermediates were found to be dealkylated in different levels or positions. The dealkylated species may be further dechlorinated but generally at a lower fraction (<10%) due to the depletion of oxidants.
Original languageEnglish
Pages (from-to)227-237
Number of pages11
JournalJournal of Hazardous Materials
Volume118
Issue number1-3
DOIs
Publication statusPublished - 14 Feb 2005

Keywords

  • Atrazine
  • Catalyzed oxidation
  • Fenton
  • Ferrous
  • Hydrogen peroxide
  • Intermediates
  • Model

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this