Synthesis and Characterization of Nano titania Particles Embedded in Mesoporous Silica with Both High Photocatalytic Activity and Adsorption Capability

Citations Over TimeTop 10% of 2005 papers

Abstract

TiO(2)-xSiO(2) composites with a high specific surface area (up to 645 m(2)/g), large pore volume, and narrow distribution with average pore sizes ranging from 15 to 20 A have been synthesized by the sol-gel method. The results of characterization by XRD, BET, TEM, FTIR, and DRUV reveal that these TiO(2)-xSiO(2) composites exhibit a core/shell structure of a nano titania/Ti-O-Si species modified titania embedded in mesoporous silica. As compared to pure anatase, the embedding of nano titania particles into the mesoporous silica matrix results in a substantial blue shift of absorption edge from 3.2 to 3.54 eV and higher UV absorption intensity, which are attributed to the formation of the Ti-O-Si species modified titania in the interface between titania and silica. The as-synthesized TiO(2)-xSiO(2) composites exhibit both much higher absorption capability of organic pollutants and better photocatalytic activity for the photooxidation of benzene than pure titania. The better photocatalytic activity of as-synthesized TiO(2)-xSiO(2) composites than pure titania is attributed to their high surface area, higher UV absorption intensity, and easy diffusion of absorbed pollutants on the absorption sites to photogenerated oxidizing radicals on the photoactive sites.

Related Papers

• → Green synthesis of mesoporous anatase TiO₂nanoparticles and their photocatalytic activities(2017)179 cited
• → Floating photocatalyst of B–N–TiO2/expanded perlite: a sol–gel synthesis with optimized mesoporous and high photocatalytic activity(2016)66 cited
• → La-modified mesoporous TiO2 nanoparticles with enhanced photocatalytic activity for elimination of VOCs(2014)9 cited
• → Hard-templating synthesis and enhanced photocatalysis of mesoporous titanium dioxides nanoparticles(2018)5 cited
• → Preparation of Ce, N-Codoped Mesoporous Titania Photocatalyst with High Photocatalytic Activity under Visible Light(2017)1 cited