Title: Size controlled nanocrystalline TiO2 supported on mesostructured SBA-15 for better photocatalytic performance
Authors: Dipti R. Sahu; Sheng-Chang Wang; L.Y. Hong; Jow-Lay Huang
Addresses: Department of Natural and Applied Science, Namibia University of Science and Technology, Private Bag 13388, Windhoek, Namibia ' Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan, Taiwan ' Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701, Taiwan ' Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701, Taiwan
Abstract: Nanocrystalline TiO2 was prepared using sol gel hydrolysis and silica SBA-15 using organic solvent method. The synthesised SBA-15 served as the TiO2 support to reduce the TiO2 grain size and well-dispersed TiO2 for enhancement of photocatalytic activity. The synthesised titania/silica composites were characterised by X-ray diffraction, FTIR, TEM, UV-Visible spectroscopy, etc. TEM micrographs showed that the organic solute template method could prepare the titania-silica composite, and successfully embedded titania in SBA-15 channel. The mesoporous structure restrained the titania grain size within 5-7 nm which caused blue shift identified by UV-Vis spectra. The photo catalytic test of this material has been studied using methylene blue which shows improved performance than TiO2. Titania loading on the silica matrix decreases the surface area of the support and there is systematic decrease in their pore volume values, as titania content increases.
Keywords: mesoporous; titania; SBA-15; nanoparticle; pore size.
International Journal of Nano and Biomaterials, 2017 Vol.7 No.2, pp.150 - 161
Received: 07 Apr 2017
Accepted: 22 Oct 2017
Published online: 22 Feb 2018 *