Odorous VOC removal by TiO TiO2 photocatalysts underUV and visible light

摘要

There are many odorous volatile organic compounds (VOCs) presented in indoor andrnoutdoor air near pollutant sources. Several technologies to remove the VOCs andrnreduce odor are available, of which the photocatalytic method has the advantages ofrnlow temperature operation as well as renewable capacity. The most famousrnphotocatalysts are the TiO2 based particles or films. They are capable of removingrnvarious kinds of odorous materials with the assistance of natural sunlight or artificialrnlight sources within the UV light range. Recently the TiO2 based photocatalystsrnhave been modified to be able to utilize a visible light source.rnThis study intends to produce TiO TiO2 based photocatalysts with the plasma assistedrnmethod. The N2 carrier gas is dissociated into N atoms in the plasma environmentrnand then doped into the photocatalyst for purposes of utilizing visible light sources.rnThe TiO2 based photocatalysts were tested to evaluate performance on removing therntoluene and isopropanol (IPA). The removal of both IPA and toluene with thernN-doped TiO2 was demonstrated to be better than pure anatase TiO TiO2 photocatalysts.rnResults of the batch reactor tests showed that near complete removals of IPA underrnboth UV (with 20 min. at 10W) and visible light (within 60 min. at 10W) sourcesrnwere achieved with the N-doped TiO2 photocatalysts. The results demonstrate thatrnthe N-doped TiO2 photocatalyst has a high potential application in the indoor/outdoorrnair pollution control.