Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions

Velasquez, M; Santander, IP; Contreras, DR; Yáñez J.; Zaror C.; Salazar, RA; Perez-Moya, M; Mansilla, HD

Abstract

This article presents experimental results on 47 mu mol 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 mu mol L-1 ferrous ions (Fe(II)) and 1856 mu mol L-1 hydrogen peroxide (H2O2), as compared with 157 mu mol L-1 (Fe(II)) and 1219 mu mol 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.

Más información

Título según WOS: Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions
Título de la Revista: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES ENVIRONMENTAL ENGINEERING
Volumen: 49
Número: 6
Editorial: TAYLOR & FRANCIS INC
Fecha de publicación: 2014
Página de inicio: 661
Página final: 670
Idioma: English
URL: http://www.tandfonline.com/doi/abs/10.1080/10934529.2014.865447
DOI:

10.1080/10934529.2014.865447

Notas: ISI