Document Detail


Model applications and mechanism study on the degradation of atrazine by Fenton's system.
MedLine Citation:
PMID:  15721548     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Atrazine (ATZ), 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine, was effectively degraded by hydroxyl radicals that were generated by FeII/H2O2 in the Fenton's process. Up to 98% ATZ removal can be achieved in the process if the doses of FeII and H2O2 are 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.
Authors:
K H Chan; W Chu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of hazardous materials     Volume:  118     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-02-21     Completed Date:  2005-06-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  227-37     Citation Subset:  IM    
Affiliation:
Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
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MeSH Terms
Descriptor/Qualifier:
Atrazine / chemistry*
Catalysis
Environmental Pollutants / analysis
Herbicides / chemistry*
Hydrogen Peroxide / chemistry
Iron / chemistry
Models, Theoretical*
Oxidation-Reduction
Chemical
Reg. No./Substance:
0/Environmental Pollutants; 0/Fenton's reagent; 0/Herbicides; 1912-24-9/Atrazine; 7439-89-6/Iron; 7722-84-1/Hydrogen Peroxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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