Photocatalytic degradation of SO2 by diffuser of light pipe coated with Nanometer TiO2 thin films

Diffusers are important parts of a light pipe which can diffuse light evenly to the place need to illuminate. The lamphouses used in the experiment were two ultraviolet radiation lamps with the power of each lamp 8W and main wavelengh was 365nm. The ultraviolet intensity on the surface of the catalyst was about 120μW/cm2. The experiments also showed that diffusers without photocatalysis could reduce the fraction volume of SO2 in a little box of 0.1 m3 volume made up of stainless steel from 1.0 × 10-6 to 0.36 × 10-6. Diffuser coated with photocatalysis within 1h SO2 fraction volume decomposed from 1.0 × 10-6 down to 0.25 × 10-6 with faster and more complete degradation of SO2. The experimental results showed that the performance of photocatalysis combined with diffusers of light pipe had better effect in a small space.