Experiment on Indoor Pollutants Reduction from Duct System Applied with TiO2 Photocatalyst

Abstract

This study analyzed the indoor pollutants (toluene, formaldehyde) reduction performance of a ventilation duct system using a titanium dioxide photocatalyst(TiO2) to improve indoor air quality. The ventilation duct system has a loop-type closed circuit structure with a diameter of 100 mm and a length of 6.6 m that includes a reaction section to which UV lamps and photocatalysts are applied. The length of the reaction section was 0.6 m, and 0.18 m2 of the photocatalyst was applied. Toluene and formaldehyde were each injected at a concentration of 1 ppm, and the average airflow velocity inside the duct was set to 1 m/s and the experiment was performed. As a result of the experiment, toluene showed 0 ppm in 14 minutes and formaldehyde showed 0 ppm in 12 minutes after the photochemical reaction had started. Therefore, it was confirmed that the indoor pollutant concentration could be reduced when the TiO2 photocatalyst is applied to the ventilation duct system.