||This study investigated the decomposition efficiency of acetone using unmodified (pure TiO2) and modified TiO2 (TiO2/ITO、TiO2/N) prepared by sputtering technology. The influence of operating parameters including wavelength and relative humidity on the decomposition efficiency of acetone was further discussed. Operating parameters investigated included light wavelength (350~400, 435~500, and 506~600 nm), photocatalysts (TiO2/ITO, TiO2/N, and TiO2), and relative humidity (RH) (0%, 50%, and 100%).|
In the experiments, acetone was degraded by photocatalysts in a self-designed batch photocatalytical reactor. Samples coated with TiO2 were placed in the batch reactor. The incident light with different wavelength was irradiated by a 20-watt lamp. Moreover, a low-pressure mercury lamp for UV light or LED lamps for blue and green lights were placed on the top of reactor. Acetone was injected into reactor by using a gasket syringe. Reactants and products were analyzed quantitatively by a gas chromatography with a flame ionization detector followed by a methaneizer (GC/FID-Methaneizer).
The structure of the photocatalyst film surface showed taper and the width of column ranged from 100 to 200 nm. The film structure showed crystallization cylindrical surface and the thickness of the photocatalyst film was in the range of 4.0-4.3 μm. The highest decomposition efficiency of acetone was observed by using TiO2/ITO under visible-light with 50% RH. The synthesis of TiO2 was mainly anatase for the tested photocatalysts. AFM images showed that the photocatalyst surface appeared rugged and the shape showed a mountain ridge distribution .
Keywords: sputtering technology, modified photocatalysts, photosensitive, acetone, photocatalytic oxidation, acetone decomposition