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

• Autores: Gallegos Florez, Daily Maria Magdalena, Guzman Ale, Rivalino Benicio, Huaracallo Idme, Albeniz Ferdinand, Lazo Alarcon, Luis Antonio, Apaza Huallpa, Edgar, Castro, Yolanda, Giovanny Ramos, Pierre, Rodriguez Rodriguez, Juan Martin
• Formato: artículo
• Fecha de Publicación: 2020
• Institución: Universidad Nacional de Ingeniería
• Repositorio: UNI-Tesis
• Lenguaje: inglés
• OAI Identifier: oai:cybertesis.uni.edu.pe:20.500.14076/29122
• Enlace del recurso: http://hdl.handle.net/20.500.14076/29122; https://doi.org/10.1155/2020/4756952
• Nivel de acceso: acceso abierto
• Materia: Spray-coating technique; Field emission scanning electron microscopy (FE-SEM); Photocatalytic; https://purl.org/pe-repo/ocde/ford#1.03.01

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.