SiO2-TiO2 Films Supported on Ignimbrite by Spray Coating for the Photocatalytic Degradation of NOx Gas and Methyl Orange Dye

• Autores: Florez D.M.M.G., Ale R.B.G., Idme A.F.H., Alarcon L.A.L., Huallpa E.A., Castro Y., Apestegui P.G.R., Rodriguez Rodriguez J.M.
• Formato: artículo
• Fecha de Publicación: 2020
• Institución: Consejo Nacional de Ciencia Tecnología e Innovación
• Repositorio: CONCYTEC-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.concytec.gob.pe:20.500.12390/2636
• Enlace del recurso: https://hdl.handle.net/20.500.12390/2636; https://doi.org/10.1155/2020/4756952
• Nivel de acceso: acceso abierto
• Materia: General Materials Science; Atomic and Molecular Physics; General Chemistry; http://purl.org/pe-repo/ocde/ford#2.11.02

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. © 2020 Daily Maria Magdalena Gallegos Florez et al.