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Artículo

Photo-Fenton degradation of the herbicide 2,4-D in aqueous medium at pH conditions close to neutrality

Conte, Leandro OscarIcon ; Schenone, Agustina VioletaIcon ; Alfano, Orlando MarioIcon
Fecha de publicación: 04/2016
Editorial: Elsevier
Revista: Journal of Environmental Management
ISSN: 0301-4797
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ingeniería Química

Resumen

A theoretical and experimental study of the photo-Fenton degradation of the herbicide 2,4- dichlorophenoxyacetic acid (2,4-D) in water is presented. A kinetic model derived from a reaction sequence is proposed using the ferrioxalate complex as iron source for conditions of pH ¼ 5. The kinetic model was employed to predict the concentrations of 2,4-D, 2,4-dichlorophenol (2,4-DCP), hydrogen peroxide (HP) and oxalate (Ox) in a flat plate laboratory reactor irradiated with a solar simulator. Two types of incident irradiation levels were tested by different combinations of attenuation filters. The effects of the oxalate/Feþ3 molar ratio (Ox/Fe), the reaction temperature (T) and the 2,4-D/HP molar ratio (R) on the photo-Fenton process were also investigated. For low radiation level and operating conditions of R ¼ 50 and T ¼ 50 ºC, a 2,4-D conversion of 95.6% was obtained after 180 min. Moreover, the 2,4-D conversion was almost 100% in only 120 min when the system was operated under the same operating conditions and high radiation level. From the proposed model and the experimental data, the corresponding kinetic parameters were estimated applying a nonlinear regression method. A good agreement between the kinetic model and experimental data, for a wide range of simulated solar operating conditions, was observed. For 2,4-D, 2,4-DCP, HP and Ox concentrations, the calculated RMSE were 1.21 x 10-2, 5.45 x 10-3, 2.86 x 10-1 and 2.65 x 10-2 mM, respectively.
Palabras clave: Photo-Fenton , Herbicide 2,4-D , Ferrioxalate , Neutral Ph
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/23805
DOI: http://dx.doi.org/10.1016/j.jenvman.2016.01.002
URL: http://www.sciencedirect.com/science/article/pii/S0301479716300020
Colecciones
Articulos(INTEC)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Citación
Conte, Leandro Oscar; Schenone, Agustina Violeta; Alfano, Orlando Mario; Photo-Fenton degradation of the herbicide 2,4-D in aqueous medium at pH conditions close to neutrality; Elsevier; Journal of Environmental Management; 170; 4-2016; 60-69
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