Abstract
Spherical and nanoporous TiO 2 and TiO 2–SiO 2 mixed micro-particles with four different compositions (20/80, 50/50, 80/20, 90/10 in weight ratio of TiO 2/SiO 2) were prepared by spray drying method from colloidal mixtures of amorphous silica and anatase titania nanoparticles. The as-prepared particles were heat-treated at 900 °C for 0.5–5 h. The TiO 2 and TiO 2–SiO 2 particles were spherical in shape and the average particle diameter was about 1 μm. The anatase mass fraction and the specific surface area of TiO 2–SiO 2 (50 wt.% SiO 2) mixed particles were kept to 61.5% and 30.6%, respectively, of their initial values after 5 h heat-treatment whereas these values of TiO 2 particles were rapidly decreased to 13.0% and 1.2% of their initial values, respectively, within 30 min after heat-treatment. And the anatase mass fraction and specific surface area increased as SiO 2 content in the TiO 2–SiO 2 mixed particles increased.
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