Destruction of VOC using photocatalyst under UC light irradiation - the influence of UV wavelength on mineralisation.

Avariety of gaseous pollutants in indoor air now are becoming an object to control. Thus, westudied a removal technique using TiO2 photocatalyst under 365 nm or 254 nm UV-lightirradiation for toluene, benzene, formaldehyde and acetaldehyde as examples of hazardousvolatile organic compounds (VOCS), in order to get detailed analytical data for productsderived from these contaminants. Although these compounds were effectively destructed, notonly CO2 but also high concentration of toxic compounds, such as aldehydes were formed inthe case of under 365 nm UV-light irradiation. However, TiO2 photocatalysis under 254 nmUV-light irradiation made possible to achieve high removal ratio of VOCS. In addition, a highconversion ratio to C02 was obtained. The purification technique using TiO2 photocatalystunder 254 nm UV-light irradiation is more effective than that under 365 nm W-lightirradiation.