Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/47788
Título: Solar photocatalytic removal of herbicides from real water by using sol-gel synthesized nanocrystalline TiO2: Operational parameters optimization and toxicity studies
Autores/as: Seck, Elhadji Idrissa
Doña-Rodríguez, J. M. 
Fernández-Rodríguez, C. 
Portillo-Carrizo, D.
Hernández-Rodríguez, M. J. 
González-Díaz, O. M. 
Pérez-Peña, J. 
Clasificación UNESCO: 221001 Catálisis
Palabras clave: 2,4-Dichlorophenoxyacetic acid
Bentazon
Photocatalysis
ECT-1023t
Vibrio fischeri, et al.
Fecha de publicación: 2013
Proyectos: Water Detoxification Using Innovative vi-Nanocatalysts 
Publicación seriada: Solar Energy 
Resumen: A comparative study of the photocatalytic activity of two different TiO2 catalysts in solar photocatalytic oxidation, mineralization and detoxification of waters containing herbicides 2,4-dichlorophenoxyacetic acid (2,4-D), bentazon and toxic intermediates was performed in a pilot plant scale photoreactor. Commercial TiO2 (Degussa P25) and TiO2 synthesized by citrate sol–gel method (ECT-1023t) were selected as photocatalysts. The optimal basic operational parameters to eliminate these herbicides and toxic intermediates were established for both catalysts at laboratory scale. ECT-1023t showed better photocatalytic activity than the commercial Degussa P25 at solar pilot plant scale with both herbicides in real water at natural pH (6.8–7.8) without any additive. The toxicity of the treated solutions was evaluated using the Microtox test based on the inhibition of bioluminescence of the bacteria Vibrio fischeri. The toxic effect of the main intermediate of 2,4-D, the 2,4-dichlorophenol (2,4-DCP), was higher than the parental herbicide. Acute toxicity of 2,4-D and intermediates (2,4-DCP) was reduced during the photocatalytic treatment by using ECT-1023t as photocatalyst. Longer times were necessary to obtain similar results when using P25 as photocatalyst. No inhibitory growth effect of the herbicide bentazon and its photoproducts on Vibrio fischeri bacteria bioluminescence was observed for either photocatalyst in any of the irradiated samples collected at predetermined times using an initial concentration of 0.1325 mM of the herbicide.
URI: http://hdl.handle.net/10553/47788
ISSN: 0038-092X
DOI: 10.1016/j.solener.2012.10.015
Fuente: Solar Energy [ISSN 0038-092X], v. 87, p. 150-157
Colección:Artículos
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