Photochemical transformation of antibiotics by excitation of Fe(III)-complexes in aqueous medium
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Data
2014-01-30
Autores
Batista, Ana Paula S. [UNESP]
Cottrell, Barbara A.
Pupo Nogueira, Raquel F. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
The degradation of sulfadiazine (STZ) and sulfathiazole (SDZ) induced by the excitation of ferric ions (Fe3+) was studied in this work. The effect of Fe3+ ion concentration, pH, iron complexation and irradiation source on the loss of these contaminants were evaluated. The increase of Fe3+ concentration from 0.20 to 0.60 mmol L-1 at pH 2.5 improved the generation of Fe2+ ions during irradiation of Fe(III)-aquacomplex achieving a maximum of 457 +/- 0.68 mu mol L-1 after 60min. However, the increase of pH from 2.5 to 4 decreased the concentration of Fe2+ to 169 +/- 0.59 mu mol L-1. The presence of Fe(III)-oxalate had a positive effect on antibiotics' degradation when compared to either Fe(III)-citrate or Fe(III)-aquacomplex complexes. Antibiotic degradation was improved during sunlight irradiation resulting in concentrations of both STZ and SDZ below the detection limit after an UV doses of 43 and 22J cm(-2) UV respectively (80 and 50 min) in the presence of Fe(III)-oxalate. (C) 2013 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Sulfonamides, Iron complexation, Photolysis process, Blacklight irradiation, Sunlight irradiation
Como citar
Journal Of Photochemistry And Photobiology A-chemistry. Lausanne: Elsevier Science Sa, v. 274, p. 50-56, 2014.