Abstract
Anatase titania (TiO 2) particles were synthesized from titanium(IV) chloride (TiCl 4) and oxygen (O 2) through an improved gas-phase reaction process under rapid heating and rapid quenching conditions. The obtained particles were decahedral-shaped highly crystalline particles with specific surface area of 5–40 m 2 g −1. These particles exhibited a level of photocatalytic activity higher than the representative commercial TiO 2 photocatalysts for oxidative decomposition of acetic acid in an aqueous solution and acetaldehyde in air. Their higher level of activity is considered to be due to a combination of their moderate specific surface area and high crystallinity.
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