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

Daily Maria Magdalena Gallegos Florez, Rivalino Benicio Guzman Ale, Albeniz Ferdinand Huaracallo Idme, Luis Antonio Lazo Alarcon, Edgar Apaza Huallpa, Yolanda Castro, Pierre Giovanny Ramos Apestegui, Juan Martin Rodriguez Rodriguez

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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.

Original languageEnglish
Article number4756952
JournalInternational Journal of Photoenergy
StatePublished - 2020

Bibliographical note

Funding Information:
This work was funded by the Universidad Nacional de San Agust?n de Arequipa, with the topic: "Evaluaci?n de Materiales Fotocataliticos y sus Aplicaciones en la Restauracion y Mantenimiento del Patrimonio Cultural de la Ciudad de Arequipa" (No. Contrato IBA 0021-2016) and the collaboration of Eva Jimenez Relinque for her technical assistance in the analysis of NOx degradation of the Institute of Building Sciences E. Torroja-Madrid. P.G.R.A and J.M.R.R wants to thank the project 32-2019-FONDECYT-BM-INC.INV.

Publisher Copyright:
© 2020 Daily Maria Magdalena Gallegos Florez et al.


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