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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.)

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

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Author(s):
Dawson, Margaret [1] ; Soares, Gabriela Byzynski [2, 3] ; Ribeiro, Caue [3]
Total Authors: 3
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of Nanoscience and Nanotechnology; v. 13, n. 7, p. 5126-5133, JUL 2013.
Web of Science Citations: 5
Abstract

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)

FAPESP's process: 09/10998-3 - Kinetic parameters involved in the photodegradation of pesticides catalyzed by TiO2 nanoparticles: comparative studies on the contribution of charge transfer and free radicals oxidation
Grantee:Gabriela Byzynski Soares
Support Opportunities: Scholarships in Brazil - Doctorate