Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 285, Issue -, Pages 491-500Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.12.026
Keywords
Atrazine; Sulfate radical; Cobalt catalyzed peroxymonosulfate; Transformation mechanism; Degradation pathways
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Funding
- Natural Science Foundation of China [51178224]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institute
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The widespread occurrence of atrazine in waters poses potential risk to ecosystem and human health. In this study, we investigated the underlying mechanisms and transformation pathways of atrazine degradation by cobalt catalyzed peroxymonosulfate (Co(II)/PMS). Co(II)/PMS was found to be more efficient for ATZ elimination in aqueous solution than Fe(II)/PMS process. ATZ oxidation by Co(II)/PMS followed pseudo-first-order kinetics, and the reaction rate constant (k(obs)) increased appreciably with increasing Co(II) concentration. Increasing initial PMS concentration favored the decomposition of ATZ, however, no linear relationship between k(obs) and PMS concentration was observed. Higher efficiency of ATZ oxidation was observed around neutral pH, implying the possibility of applying Co(II)/PMS process under environmental realistic conditions. Natural organic matter (NOM), chloride (Cl-) and bicarbonate (HCO3-) showed detrimental effects on ATZ degradation, particularly at higher concentrations. Eleven products were identified by applying solid phase extraction-liquid chromatography-mass spectrometry (SPE-LC/MS) techniques. Major transformation pathways of ATZ included dealkylation, dechlorination-hydroxylation, and alkyl chain oxidation. Detailed mechanisms responsible for these transformation pathways were discussed. Our results reveal that Co(II)/PMS process might be an efficient technique for remediation of groundwater contaminated by ATZ and structurally related s-triazine herbicides. (C) 2014 Elsevier B.V. All rights reserved.
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