Inhibition Effect of SO sub(2) on NO sub(x) and VOCs During the Photodegradation of Synchronous Indoor Air Pollutants at Parts Per Billion (ppb) Level by TiO sub(2)

• Published in: Applied catalysis. B, Environmental Environmental, 2004-05, Vol.49 (3), p.187-187
• Main Authors: Ao, CH, Lee, S C, Zou, S C, Mak, CL
• Format: Article
• Language: English
• ISSN: 0926-3373
• DOI: 10.1016/j.apcatb.2003.12.011

Many types of catalysts are poisoned by the presence of sulfur-containing compounds. Tests investigating the feasibility of photocatalytic technologies for the purification of indoor air considered a typical atmospheric SO sub(2) concentration of 200 ppb. As part of the testing process, SO sub(2) was co-injected with 200 ppb NO and 20 ppb benzene, toluene, ethylbenzene, and o-xylene to help characterize the influences of other typical indoor air pollutants. These tests utilized TiO sub(2) coated on a glass fiber filter as the photocatalyst. Evidence showed no photodegradation of SO sub(2). A blank glass fiber filter proved capable of adsorbing over 75% of the SO sub(2). Researchers concluded that the inhibition effect of SO sub(2) was due to competition between the sulfate ion and pollutants for adsorption sites on TiO sub(2).