Use of the Sol–Gel Method for Titania Coating and the Effect of Support Silica Particle Size

Publisher： VSP

ISSN： 1568-5527

Source： Advanced Powder Technology, Vol.19, Iss.1, 2008-01, pp. : 39-48

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Abstract

For silica particles of two different sizes (0.9 and 3.2 m), TiO₂ coating was performed using the sol–gel method. The results showed that size of primary TiO₂ particles that accumulated on the silica surface was essentially the same regardless of the silica particle sizes. Reduction in specific surface area of TiO₂-coated silica particles after calcination was observed to the same extent for both cases. Activity of the TiO₂-coated silica particles was evaluated by photocatalytic decomposition of 2,4-dinitrophenol. The decomposition rate constant for both support sizes was proportional to the surface area of the anatase phase of TiO₂ coated on silica particles. The decomposition rate constant was also essentially the same for both particle sizes. It was found that the silica particle size had a small effect on the surface morphology of the TiO₂-coated silica particle and its photocatalytic activity.