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Title: Inhibition effect of SO2 on NOx and VOCs during the photodegradation of synchronous indoor air pollutants at parts per billion (ppb) level by TiO2
Authors: Ao, CH
Lee, SC 
Zou, SC
Mak, CL 
Keywords: Titanium dioxide
Trace level
Issue Date: 2004
Publisher: Elsevier
Source: Applied catalysis B : environmental, 2004, v. 49, no. 3, p. 187-193 How to cite?
Journal: Applied catalysis B : environmental 
Abstract: Sulfur-containing compounds are well-known catalyst poisons. To evaluate the feasibility of photocatalytic technology for indoor air purification, a typical atmospheric SO 2 concentration of 200 parts per billion (ppb) was selected. In order to further evaluate the impact of SO 2 on the photocatalytic activity of other typical indoor air pollutants, SO 2 was co-injected with 200ppb NO and 20ppb benzene, toluene, ethylbenzene, and o-xylene (BTEX) using TiO 2 (P-25) as photocatalyst coated on a glass fiber filter. A concurrent photodegradation of SO 2 with NO, SO 2 with BTEX, and SO 2 with NO and BTEX was also conducted. Results showed that no photodegradation of SO 2 was found. However, the blank glass fiber filter adsorbed more than 75% of the SO 2 . The conversion of NO decreased by 8% and the generation of NO 2 increased by 10% with the presence of SO 2 . A similar inhibition effect was found on the photodegradation of BTEX with the presence of SO 2 . The presence of SO 2 decreased the conversion of BTEX by more than 10%. Ion chromatography analysis on the TiO 2 glass fiber filter showed that sulfate ion was formed from the adsorption of SO 2 . The formation of sulfate ion inhibited the formation of nitrate ion, which increased the generation of NO 2 . It is suggested that the inhibition effect of SO 2 is due to the sulfate ion competing with the pollutant for adsorption sites on TiO 2 . The promotion effect of NO on BTEX was also reduced by the presence of SO 2 .
ISSN: 0926-3373
EISSN: 1873-3883
DOI: 10.1016/j.apcatb.2003.12.011
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