Artículo
In situ generated TiO2 over zeolitic supports as reusable photocatalysts for the degradation of dichlorvos
Gómez, Silvina del Valle
; Leal Marchena, Candelaria
; Renzini, Maria Soledad
; Pizzio, Luis Rene
; Pierella, Liliana Beatriz
Fecha de publicación:
01/2015
Editorial:
Elsevier
Revista:
Applied Catalysis B: Environmental
ISSN:
0926-3373
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Materials based on titania supported on zeolitic matrices (HBETA, HY and HZSM5) were synthesized by in situ generation of TiO2. The supported catalysts characterized by XRD indicate the presence of the anatase phase alone. The materials were also characterized by FTIR, S BET, and UV-VIS DRS. A high TiO2 content produced lower degradation, due to the presence of TiO2 particle aggregates of greater size on the zeolite matrix surface, as evidenced by the calculated crystal size. TiO2/HBETA(20%) presented more activity than TiO2 supported on the other matrices due to higher adsorption of dichlorvos on HBETA. It has more surface area and a lower band gap value too, which makes it more effective. The mineralization degree is lower than the degradation percentage due to the formation of organophosphorous intermediates that are less toxic than the starting material. The complete degradation and mineralization of the pollutant was obtained in 360 and 540 min of reaction with TiO2/HBETA(20%), respectively. This catalyst resulted in degradation percentages close to that of commercial TiO2 P25. The main advantage of supported catalysts is their easy separation and reuse, in this case resulting in a very low activity loss during eight cycles. These materials present suitable properties to be used as catalysts in the photocatalytic treatment of wastewater that contains pesticide dichlorvos in water.
Palabras clave:
Photodegradation
,
Dichlorvos
,
Titanium Dioxide
,
Zeolites
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Articulos(CINDECA)
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"
Articulos(CITEQ)
Articulos de CENTRO DE INVESTIGACION Y TECNOLOGIA QUIMICA
Articulos de CENTRO DE INVESTIGACION Y TECNOLOGIA QUIMICA
Citación
Gómez, Silvina del Valle; Leal Marchena, Candelaria; Renzini, Maria Soledad; Pizzio, Luis Rene; Pierella, Liliana Beatriz; In situ generated TiO2 over zeolitic supports as reusable photocatalysts for the degradation of dichlorvos; Elsevier; Applied Catalysis B: Environmental; 162; 1-2015; 167-173
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