Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions.

Abstract

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 (H2O2), as compared with 157 μmol L(-1) (Fe(II)) and 1219 μmol L(-1) (H2O2) 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.

DOI: 10.1080/10934529.2014.865447

Cite this paper

@article{Velsquez2014OxidativeDO, title={Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions.}, author={Mariz{\'u} Vel{\'a}squez and Iv{\'a}n Santander and David Robles Contreras and Jorge Andres Ferrando Yanez and Claudio A Zaror and Ricardo A Salazar and Montserrat P{\'e}rez-Moya and H{\'e}ctor D Mansilla}, journal={Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering}, year={2014}, volume={49 6}, pages={661-70} }