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https://hdl.handle.net/10316/7779
Título: | Photodegradation of atrazine and ametryn with visible light using water soluble porphyrins as sensitizers | Autor: | Rebelo, Susana Melo, A. Coimbra, R. Azenha, M. Pereira, Mariette Burrows, Hugh Sarakha, Mohamed |
Data: | 2007 | Citação: | Environmental Chemistry Letters. 5:1 (2007) 29-33 | Resumo: | 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: | https://hdl.handle.net/10316/7779 | DOI: | 10.1007/s10311-006-0072-z | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Química - Artigos em Revistas Internacionais |
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