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New insights into atrazine degradation by cobalt catalyzed peroxymonosulfate oxidation: kinetics, reaction products and transformation mechanisms.
J Hazard Mater. 2015 Mar 21; 285:491-500.JH

Abstract

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.

Authors+Show Affiliations

College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: yuefeiji@njau.edu.cn.College of Sciences, Nanjing Agricultural University,Nanjing 210095, China.Nanjing Institute of Environmental Science, Ministry of Environmental Protection of PRC, Nanjing 210042, China.College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: jhlu@njau.edu.cn.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25544494

Citation

Ji, Yuefei, et al. "New Insights Into Atrazine Degradation By Cobalt Catalyzed Peroxymonosulfate Oxidation: Kinetics, Reaction Products and Transformation Mechanisms." Journal of Hazardous Materials, vol. 285, 2015, pp. 491-500.
Ji Y, Dong C, Kong D, et al. New insights into atrazine degradation by cobalt catalyzed peroxymonosulfate oxidation: kinetics, reaction products and transformation mechanisms. J Hazard Mater. 2015;285:491-500.
Ji, Y., Dong, C., Kong, D., & Lu, J. (2015). New insights into atrazine degradation by cobalt catalyzed peroxymonosulfate oxidation: kinetics, reaction products and transformation mechanisms. Journal of Hazardous Materials, 285, 491-500. https://doi.org/10.1016/j.jhazmat.2014.12.026
Ji Y, et al. New Insights Into Atrazine Degradation By Cobalt Catalyzed Peroxymonosulfate Oxidation: Kinetics, Reaction Products and Transformation Mechanisms. J Hazard Mater. 2015 Mar 21;285:491-500. PubMed PMID: 25544494.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - New insights into atrazine degradation by cobalt catalyzed peroxymonosulfate oxidation: kinetics, reaction products and transformation mechanisms. AU - Ji,Yuefei, AU - Dong,Changxun, AU - Kong,Deyang, AU - Lu,Junhe, Y1 - 2014/12/16/ PY - 2014/10/08/received PY - 2014/12/01/revised PY - 2014/12/15/accepted PY - 2014/12/30/entrez PY - 2014/12/30/pubmed PY - 2015/10/23/medline KW - Atrazine KW - Cobalt catalyzed peroxymonosulfate KW - Degradation pathways KW - Sulfate radical KW - Transformation mechanism SP - 491 EP - 500 JF - Journal of hazardous materials JO - J Hazard Mater VL - 285 N2 - 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. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/25544494/New_insights_into_atrazine_degradation_by_cobalt_catalyzed_peroxymonosulfate_oxidation:_kinetics_reaction_products_and_transformation_mechanisms_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(14)01010-3 DB - PRIME DP - Unbound Medicine ER -