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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermally stable SiO2@TiO2 core@shell nanoparticles for application in photocatalytic self-cleaning ceramic tiles

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Author(s):
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Ferreira-Neto, Elias P. [1, 2] ; Ullah, Sajjad [3, 2, 4] ; Martinez, Vitor P. [1] ; Yabarrena, Jean M. S. C. [1] ; Simoes, Mateus B. [1] ; Perissinotto, Amanda P. [1] ; Wender, Heberton [4] ; de Vicente, Fabio S. [5] ; Noeske, Paul-Ludwig M. [6] ; Ribeiro, Sidney J. L. [2] ; Rodrigues-Filho, Ubirajara P. [1]
Total Authors: 11
Affiliation:
[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
[3] Univ Peshawar, Inst Chem Sci, Peshawar 25120, KP - Pakistan
[4] Fed Univ Mato Grosso do Sul UFMS, Inst Phys, Av Costa e Silva S-N, BR-79070900 Campo Grande, MS - Brazil
[5] Sao Paulo State Univ UNESP, Dept Phys, Inst Geosci & Exact Sci, BR-13500970 Rio Claro, SP - Brazil
[6] Fraunhofer Inst Mfg Technol & Adv Mat, D-28359 Bremen - Germany
Total Affiliations: 6
Document type: Journal article
Source: MATERIALS ADVANCES; v. 2, n. 6, p. 2085-2096, MAR 21 2021.
Web of Science Citations: 0
Abstract

Photocatalyst-coated self-cleaning ceramic tiles are in high demand for indoor and outdoor applications aimed at keeping a clean environment. Their industrial processing, however, often requires firing at temperature (1000-1200 degrees C) much higher than the thermal stability limits of common photocatalysts (<1000 degrees C) which results a significant loss in self-cleaning activity of the tiles. To address this issue, we have coated commercial ceramic tiles with thermally stable core@shell SiO2@TiO2 particles, which even after single-fire industrial treatment (1000-1140 degrees C), exhibit excellent self-cleaning activity, much higher than that of control tiles prepared with commercial benchmark P25 TiO2 photocatalyst. Importantly, the photocatalytic activity of SiO2@TiO2 particles, in both powder form and as coatings on ceramic tiles, enhanced with the increase in calcination temperature (to as high as 1000-1140 degrees C) which is in sharp contrast to the normal photocatalytic behavior of unsupported TiO2. This article explores in details the exceptionally high and industrially relevant thermal stability of silica-supported anatase nanocrystals (5 nm) (SiO2@TiO2) against phase transition and crystallite growth and brings new insight into the effect of core@shell configuration on the thermal stability and photoactivity of SiO2@TiO2 particles. A comprehensive discussion on the relationship between core@shell structure, thermal stability and photoactivity is presented. These SiO2@TiO2 particles with ideal physicochemical characteristics (small phase-pure anatase nanocrystals with higher resistance towards crystallite growth, phase transformation or surface-area loss upon calcination) are ideal photocatalytic materials for efficient photodegradation of organic pollutants for effective environmental remediation and other applications that involve high-temperature processing such as self-cleaning coatings and photocatalytic ceramics. (AU)

FAPESP's process: 13/24948-3 - CO2 Fixation by SiO2@TiO2 nanoparticles decorated with Iron Ferrocyanide (Prussian Blue) and Ruthenium Ferrocyanide: Toward high Sustainability of Biorefineries and Ammonia Synthesis Plants.
Grantee:Elias Paiva Ferreira Neto
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/19785-1 - CO2 as a raw material for hybrid multi-functional materials: improving the sustainability of industrial processes
Grantee:Ubirajara Pereira Rodrigues Filho
Support Opportunities: Research Program on Global Climate Change - Regular Grants
FAPESP's process: 18/01934-0 - Aerogels based on transition metal disulfides and bacterial cellulose: bifunctional nanomaterials with photocatalytic and adsorptive properties for environmental applications
Grantee:Elias Paiva Ferreira Neto
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 15/22828-6 - Pushing the boundaries of optical fibers: from photonics to optogenetics and environmental monitoring
Grantee:Younes Messaddeq
Support Opportunities: Research Projects - SPEC Program