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

Autor(es):Mostrar menos -

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS ADVANCES; v. 2, n. 6, p. 2085-2096, MAR 21 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 13/24948-3 - Fixação de CO2 por Nanoparticulas de SiO2@TiO2 decoradas com Ferrocianeto de Ferro (Azul da Prússia) e Ferrocianeto de Rutênio: Uma Possível Alternativa para o aumento de Sustentabilidade de Biorefinarias e Plantas de Síntese de Amônia
• Beneficiário: Elias Paiva Ferreira Neto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/19785-1 - CO2 como matéria-prima para materiais híbridos multifuncionais: uma colaboração para aumentar a sustentabilidade de processos industriais
• Beneficiário: Ubirajara Pereira Rodrigues Filho
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 18/01934-0 - Aerogéis de dissulfetos de metais de transição e celulose bacteriana: nanomateriais bifuncionais com propriedades fotocatalíticas e adsortivas para aplicações ambientais
• Beneficiário: Elias Paiva Ferreira Neto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/22828-6 - Ultrapassando as fronteiras de fibras ópticas: da fotônica até optogenética e monitoramento de meio ambiente
• Beneficiário: Younes Messaddeq
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC