Two kinds of activated carbon (AC) particles, which possess large adsorption capacity for gaseous ammonia and trichloroethylene (TCE), were selected as the carrier of TiO 2 ultrafine powders. Commercially available TiO 2 sol solutions were used as the source of TiO 2 powders. For the sake of comparison, porous glass (PG) particles and alumina (AL) particles were also selected as the carrier. The photocatalytic activity of TiO 2 /AC, TiO 2 /PG, and TiO 2 /AL was examined using a circulation reaction method. The photocatalytic degradation of gaseous ammonia and TCE was found apparently to obey the first-order reaction with respect to ammonia or TCE. The first-order reaction rate constant over TiO 2 /AC was shown apparently to be higher than those over TiO 2 /PG and TiO 2 /AL. The observed relationship between the apparent first-order rate constant and the TiO 2 catalyst loading could be interpreted satisfactorily in terms of a reaction model based on the premise that the degradation rate constant is proportional to the illumination intensity, whose decay obeys the Lambert-Beer law; this is an extension of the reaction model in a three-phase fluidized-bed reactor under illumination proposed in our preceding paper.
Photocatalytic degradation of gaseous ammonia and trichloroethylene over tio 2 ultrafine powders deposited on activated carbon particles
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