TiO_2/SiO_2複合ナノ粒子の水熱合成とその光触媒性能

概要

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Anatase (TiO_2)/silica (SiO_2) composite nanoparticles over the compositional range of SiO_2 = 0-70.9mol% were directly formed from acidic precursor solutions of TiOSO_4 and tetraethylorthosilicate by hydrolysis under mild hydrothermal conditions at 200℃. With increasing SiO_2 content, the specific surface area of the as-prepared composite nanoparticles increased from 109 (SiO_2 = 0mol%) to 277 m^2/g (SiO_2 = 70.9mol%), which was associated with an increase in the amorphous phase content. The composite nanoparticles with a unique microstructure, i.e., anatase crystallites 14-16 nm in size that exist separately due to the presence of an amorphous silica phase in the TiO_2/SiO_2 interface, showed enhanced photocatalytic activities for the decomposition of methylene blue (MB) in aqueous solution and better removal of NO gas in comparison with pure anatase-type TiO_2. The highest photoactivity was obtained when the SiO_2 content in the composites was 25.1 mol% for MB decomposition and 48.2 mol% for NO oxidation.
社団法人日本セラミックス協会の論文
2004-03-01