Please use this identifier to cite or link to this item: http://eia-dspace.metabiblioteca.com/handle/11190/103
Title: Síntesis y caracterización de óxidos mixtos de sílice-titania preparados por método sol-gel y tratamiento hidrotérmico
Other Titles: Synthesis and characterization of silica-titania mixed oxides prepared by sol–gel method and hydrothermal treatment
Síntese e caracterização de óxidos mistos de sílice-titânia preparados pelo método sol-gel e tratamento hidrotérmico
Issue Date: 25-Oct-2013
Abstract: Mixed oxides SiO2-TiO2 were prepared of different compositions by the sol-gel method combined with hydro-thermal treatment (HT), using tetraethylorthosilicate and titanium tetraisopropoxide as precursors of the sources silica and titanium, respectively. Hybrids obtained using the nonionic surfactant Triton X100, were carried out with TH for 48 hours at 120 °C, washed, dried at 70 °C/24 h, and calcined at 550 °C/2 h (heating rate 1 °C/min.). The mixed oxides were characterized by nitrogen physisorption, SEM, TEM, FTIR, XRD and TGA. The results indicate that the materials presented high specific surface area in the range of 190-805 m2/g, average pore diameter 4,0- 6,5 nm, additionally, the silica-titania mixed oxides exhibits anatase phase desirable in photocatalytic reactions.
Description: Se prepararon óxidos mixtos de SiO2-TiO2 de diferente composición por el método sol-gel combinado con tratamiento hidrotérmico (TH), utilizando como precursores tetraetilortosilicato y tetraisopropóxido de titanio como fuente de silicio y titanio respectivamente. Los híbridos obtenidos usando el tensoactivo no iónico Triton X100, fueron sometidos a TH por 48 horas a 120 °C, a lavado, secado a 70 °C/24 h y calcinación a 550 °C/2 h (rampa de 1°C/min.). Los óxidos mixtos que se caracterizaron por fisisorción de nitrógeno, SEM, TEM, FTIR, DRX y TGA, presentan área específica alta, en el intervalo de 190-805 m2/g y diámetro promedio de poro de 4,0-6,5 nm además muestran la presencia de la fase anatasa deseable en reacciones fotocatalíticas.
URI: http://hdl.handle.net/11190/103
Appears in Collections:Revista EIA

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