| 초록 |
Carbon-coasted TiO2 samples were prepared from the mixture of poly (vinyl alcohol) and commercial TiO2 (P-25) with different mass ratios at a heating temperatures of 500-900℃for 1h in high purity Argon gas flow. The samples were characterized by XRD, SEM, TEM, TGI and BET analysis. Adsorption properties and photocatalytic activities of commercial and carbon-coated TiO2 catalysts were compared for the oxidation of methylene blue (MB). The photocatalytic degradation of MB in a batch photocatalytic reactor, using a UV lamp as a light source and TiO2 as a photocatalyst, was investigated. The effects of various parameters such as the initial MB concentration, and the initial pH on the MB degradation rate of TiO2 photocatalysis were examined. In the presence of both UV light illumination and TiO2 catalyst, MB was more effectively degraded than with either UV or TiO2 alone. The reaction rate was found to obey pseudo first-order kinetics represented by the Langmuir–Hinshelwood model. It was also observed that carbon-coated samples gave faster kinetics for the oxidation of organic molecules. |
