کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
26775 | 43976 | 2014 | 7 صفحه PDF | دانلود رایگان |
• Degradation of sulfadiazine and sulfathiazole induced by excitation of Fe3+ ions was evaluated.
• The effect of ferric ion concentration, pH, iron complexation and irradiation source in photodegradation of antibiotics was demonstrated.
• Possible competition of remaining citrate ligand carbon with target compound (or its degradation products) for either HO or other radical formed during Fe(III)-citrate photolysis.
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 μmol L−1 after 60 min. However, the increase of pH from 2.5 to 4 decreased the concentration of Fe2+ to 169 ± 0.59 μmol 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 22 J cm−2 UV respectively (80 and 50 min) in the presence of Fe(III)-oxalate.
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Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 274, 30 January 2014, Pages 50–56