Photocatalytic activity of TiO₂ particulate films prepared by depositing TiO₂ particles with various sizes

Abstract

TiO₂ particles of various sizes were prepared by grinding in cyclohexanone, and TiO₂ particulate films were obtained by depositing these TiO₂ particles with various sizes onto a glass or quartz substrate. The effect of the particle size and thickness on the photocatalytic properties of the films was evaluated via oxidative degradation of gaseous 2-propanol. The initial rate of 2-propanol degradation under UV light irradiation for the films deposited with 30nm TiO₂ particles increased with increasing film thickness up to 600nm, and reached a saturated value above this film thickness. Photocatalytic activity for the films with thickness below 600nm was larger when smaller TiO₂ particles were deposited onto the substrate, due to the increase in the surface area of the particulate films. Furthermore, saturated values of the photocatalytic activity for thick films were smaller for the films deposited with smaller particles, which is mainly attributed to the change in crystal form of the particles during the grinding treatment.

Keywords::

• Tio2 Photocatalyst Cyclohexanone 2-PROPANOL Particle Size