Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

• The coaxial-flow gas phase reactor was used to prepare decahedral anatase particles.
• The method ensures high reproducibility and reaction yield of the DAPs synthesis.
• The influence of preparation parameters on the DAPs properties was discussed.
• DAPs show high level of photocatalytic activity for various reaction systems.

Decahedral-shaped anatase particles (DAPs) were prepared by a gas-phase process consisting of titanium(IV) chloride oxidation. The use of a coaxial-flow gas-phase reactor resulted in high reaction yield (ca. 70%) and good reproducibility of DAPs production. The influence of controlled and resultant preparation parameters on the process course and on DAPs properties (such as specific surface area, particle size and particle morphology) is discussed in detail. Correlations between preparation parameters and product properties indicated the best conditions for obtaining DAPs of high quality and thus with a high level of photocatalytic activity for various reaction systems.

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