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

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. · International Journal of Photoenergy (2020) · DOI: 10.1155/2020/4756952

Resumen

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.

Instituciones: Universidad Nacional de San Agustín de Arequipa; Universidad Nacional de Ingeniería