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Type: Artigo de periódico
Title: Annealing Temperature Effects On Sol-gel Nanostructured Mesoporous Tio 2/sio2 And Its Photocatalytic Activity
Author: Strauss M.
Maroneze C.M.
De Souza E Silva J.M.
Sigoli F.A.
Gushikem Y.
Mazali I.O.
Abstract: Mesoporous TiO2/SiO2 (5 wt% TiO2) was synthesized by the sol-gel method and thermally treated up to 1273 K. The materials obtained were characterized by N2 adsorption/desorption isotherms, XRD, TEM, Raman and UV-vis diffuse reflectance spectroscopies. The results indicate the presence of thermally stable anatase TiO2 nanoparticles (∼20 nm) highly dispersed in the SiO2 matrix, with no evidence of particle growth for materials treated up to 1073 K. Important features related to the number of structural defects and short-distance ordering of TiO2 nanoparticles were found and they have a direct relationship with the photocatalytic performance of the materials. Higher photocatalytic activity toward methylene blue decolourisation was observed for solids annealed at higher temperatures. © 2010 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.matchemphys.2010.11.041
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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