Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/7779
Title: Photodegradation of atrazine and ametryn with visible light using water soluble porphyrins as sensitizers
Authors: Rebelo, Susana 
Melo, A. 
Coimbra, R. 
Azenha, M. 
Pereira, Mariette 
Burrows, Hugh 
Sarakha, Mohamed 
Issue Date: 2007
Citation: Environmental Chemistry Letters. 5:1 (2007) 29-33
Abstract: Abstract The photodegradation of the herbicides atrazine and ametryn with visible light in aerated neutral aqueous solutions and 5, 10, 15, 20-tetrakis (2,6-dichloro-3-sulfophenyl) porphyrin or 5, 10, 15, 20-tetrakis (4-sulfophenyl) porphyrin as sensitizers are reported for the first time. Our findings show that the degradation percentage reached 30% for atrazine and 63% for ametryn. The final photoproducts were characterized as dealkylated s-triazines. Photolysis of the pesticides in the presence of a singlet oxygen quencher showed only a minor contribution of this type of mechanism, while a bimolecular quenching reaction between the triplet state of the sensitizer and the pesticides is excluded by flash photolysis studies. It is proposed that the mechanism may involve the formation of a superoxide radical anion from the triplet state of the sensitizer and molecular oxygen, followed by a radical decomposition pathway.
URI: http://hdl.handle.net/10316/7779
DOI: 10.1007/s10311-006-0072-z
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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