En el presente trabajo se reporta la síntesis y caracterización morfológica de nanotubos de ZnO, fabricados a partir de semillas de óxido de zinc fabricadas por el método del rociado pirolítico. El crecimiento de los nanotubos de ZnO se llevó a cabo sumergiendo los sustratos con las semillas de ZnO en una solución acuosa de nitrato de zinc y metenamina. Las muestras fabricadas bajo diferentes condiciones se analizaron en su morfología por Microscopia Electrónica de Barrido.

PROCYT 226- 2008 -CONCYTEC-OAJ

sponce@ulima.edu.pe;jquinof@ulima.edu.pe;agutarra@ulima.edu.pe

In this work, a SiO2-TiO2 coating, composed of different numbers of TiO2 and SiO2 layers, was fabricated by a spray-coating technique. The films were deposited onto ignimbrite rock and divided into two groups according to the number of SiO2 layers applied, 10 and 15 layers of SiO2 and 5 layers of TiO2 for each group. The morphology and chemical composition of the synthesized samples were characterized by field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometer (EDS), which reveal the successful SiO2-TiO2 coating on ignimbrite. The photocatalytic activities of samples obtained were evaluated toward the decomposition of 3 ppm of methyl orange (MO). Finally, NOx gas degradation was studied. The obtained results evidenced that the SiO2 and TiO2 coating improved the photocatalytic activity of ignimbrite.