Preparation and Photocatalytical Performance of TiO2:SiO2 Nanocomposites Produced by the Polymeric Precursors Method

Autor(es)

Dawson, Margaret ^[1] ; Soares, Gabriela Byzynski ^{[2, 3]} ; Ribeiro, Caue ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

^[3] Embrapa Instrumentacao, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Nanoscience and Nanotechnology; v. 13, n. 7, p. 5126-5133, JUL 2013.
• Citações Web of Science: 5

Resumo

Anatase TiO2 is a promising photocatalyst due to its chemical stability, non-toxic characteristics, notable UV light absorption as well as photo-corrosion resistance and oxidative properties. Surface area and TiO2 dispersion quality are important factors that affect photoactivity of TiO2:SiO2 nanoconnposites. In order to improve these factors, TiO2 nanoparticles were immobilized on mesoporous silica substrate through the polymeric precursors method, obtaining the nanoconnposites in a simple routine. The TiO2 resin was synthesized by the polymeric precursors method and different resin thickness (0.5; 1.0; 2.0; 3.5; 5.0 nm) on silica were synthesized by calcination during 4 hours at 450 degrees C in pH 1.5. The selected pH for immobilization ensured adhesion of TiO2 nanoparticles onto the silica substrate surface. X-Ray Diffraction patterns indicate that all samples were predominantly anatase phase and immobilization improved surface area. Ametryn kinetic evaluation presents better results for SAM 3.5 and SAM 0.5. The results show that difference in TiO2 loading, surface area and crystallinity of samples are factors that influence photocatalytic efficiency. (AU)

• Processo FAPESP: 09/10998-3 - Avaliação de parâmetros cinéticos envolvidos na fotodegradação de pesticidas catalisada por nanopartículas de TiO2: estudos comparativos sobre a contribuição de processos de transferência de carga e oxidação por radicais livres
• Beneficiário: Gabriela Byzynski Soares
• Modalidade de apoio: Bolsas no Brasil - Doutorado