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Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions

Journal of Environmental Science and Health, Part A, 12 May 2014, Vol.49(6), p.661-670 [Peer Reviewed Journal]

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  • Title:
    Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions
  • Author: Velásquez, Marizú ; Santander, I. Paola ; Contreras, David R. ; Yáñez, Jorge ; Zaror, Claudio ; Salazar, Ricardo A. ; Pérez-Moya, Montserrat ; Mansilla, Héctor D.
  • Found In: Journal of Environmental Science and Health, Part A, 12 May 2014, Vol.49(6), p.661-670 [Peer Reviewed Journal]
  • Subjects: Antibiotics ; Fenton ; Photo-Fenton ; Rsm ; Sulfathiazole
  • Publication Details: Taylor & Francis Group
  • Language: English
  • Description: This article presents experimental results on 47 μmol L −1 sulfathiazole (STZ) degradation by Fenton and photo-Fenton reactions using multivariate analysis. The optimal experimental conditions for reactions were obtained by Response Surface Methodology (RSM). In the case of the Fenton reactions there were 192 μmol L −1 ferrous ions (Fe(II)) and 1856 μmol L −1 hydrogen peroxide (H 2 O 2 ), as compared with 157 μmol L −1 (Fe(II)) and 1219 μmol L −1 (H 2 O 2 ) for photo-Fenton reactions. Under these conditions, around 90% of STZ degradation were achieved after 8 minutes treatment by Fenton and photo-Fenton reactions, respectively. Moreover, a marked difference was observed in the total organic carbon (TOC) removal after 60-min treatment, achieving 30% and 75% for the Fenton and photo-Fenton reactions, respectively. Acetic, maleic, succinic and oxamic acids could be identified as main Fenton oxidation intermediates. A similar pattern was found in the case of photo-Fenton reaction, including the presence of oxalic acid and ammonia at short periods of irradiation with UV-A. The calculated values of Average Oxidation State (AOS) corroborate the formation of oxidized products from the initial steps of the reaction.
  • Identifier: ISSN: 1093-4529 ; E-ISSN: 1532-4117 ; DOI: 10.1080/10934529.2014.865447

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