Gas-Phase Photocatalytic Degradation Of Volatile Organic Compounds On Nanometer Titanium Dioxide

TiO₂ Photocatalytic Oxidization, one of the advanced oxidization processes(AOP), has developed in recent 30 years. Compared with liquid phase reaction process, gas phase photocatalytic oxidation reaction features high reaction velocity, good exploitation rate of light, large volume flow, which could oxidize reactant completely and free of solvent influence, and therefore lead to the wide application.we took 1,1,1-trichloroethane(TCE), trichloromethane(TCM) and benzene as simulated pollutants and mainly investigated the influences of gaseous diffusion, catalyst dosage, initial concentration, relative humidity, gas flow rate and catalyst activity on the degradation reaction in the gas-solid phase photocatalytic experimental device designed by ourself using TiO₂-coated film as photocatalyst and UV light as photosource. The degradation efficiency under sunlight irradiation was studied and also the preliminary reaction kinetics.The results indicated the great degradation efficiency of TCE, TCM and benzene. When the initial concentration of TCE, TCM and benzene was no...