Removal of VOC by photocatalytic degradation involving photochemical reaction with O3 under short-wavelength UV irradiation.

Photocatalytic degradation of volatile organic compounds (VOC) with short-wavelength UVlight (254 nm) is an attractive technique in the view of perfect mineralization to CO2. In thisstudy, shorter wavelength of UV light involving 185 nm which generates O3 was used as a lightsource, and as a photocatalyst, titanium dioxide (TiO2) and its mixture with ozonedecomposition catalyst (ODC) was tested to improve photocatalytic activity. Their validity wasevaluated from the removal ratio of toluene by photocatalysis and the size distribution ofgenerated particles by gas-to-particle conversion. Using shok-wavelength UV-light with 185nm and O3, both photocatalytic degradation and photochemical reaction (gas-to-particleconversion) via labile species (i. e. O3, O*, OH etc.) caused simultaneously VOC destruction.