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SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation

1
Graduate and Research Division, Engineering Faculty, Universidad Autónoma de Querétaro, Cerro de las Campanas, Santiago de Querétaro 76010, Mexico
2
Civil and Industrial Engineering Department, Engineering Faculty, Pontificia Universidad Javeriana Cali, Calle 18 #118-250, Cali 760031, Colombia
3
Group of Composite Materials, School of Materials, Faculty of Engineering, Universidad del Valle, Calle 13 #100-00, Cali 76001, Colombia
*
Author to whom correspondence should be addressed.
Coatings 2018, 8(4), 120; https://doi.org/10.3390/coatings8040120
Received: 2 February 2018 / Revised: 12 March 2018 / Accepted: 19 March 2018 / Published: 24 March 2018
(This article belongs to the Special Issue Nanocoatings with Air-Purifying Properties)
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Abstract

Use of silicon dioxide (SiO2) and titanium dioxide (TiO2) have been widely investigated individually in coatings technology, but their combined properties promote compatibility for different innovative applications. For example, the photocatalytic properties of TiO2 coatings, when exposed to UV light, have interesting environmental applications, such as air purification, self-cleaning and antibacterial properties. However, as reported in different pilot projects, serious durability problems, associated with the adhesion between the substrate and TiO2, have been evidenced. Thus, the aim of this work is to synthesize SiO2 together with TiO2 to increase the durability of the photocatalytic coating without affecting its photocatalytic potential. Therefore, synthesis using sonochemistry, synthesis without sonochemistry, physical characterization, photocatalytic evaluation, and durability of the SiO2, SiO2@TiO2 and TiO2 coatings are presented. Results indicate that using SiO2 improved the durability of the TiO2 coating without affecting its photocatalytic properties. Thus, this novel SiO2@TiO2 coating shows potential for developing long-lasting, self-cleaning and air-purifying construction materials. View Full-Text
Keywords: hydrophobic; photocatalytic; sonochemistry; coating; mortar hydrophobic; photocatalytic; sonochemistry; coating; mortar
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Rosales, A.; Maury-Ramírez, A.; Gutiérrez, R.-D.; Guzmán, C.; Esquivel, K. SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation. Coatings 2018, 8, 120.

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