Hahn MS  Yun CY  Yi J

Vol. 11,  No. 3, pp. 123-128, Sep.  2005

이산화티탄 백금 가시광 전자ㆍ정공 분리 광촉매 활성

PDF

Among various metal oxides semiconductors, TiO2 is the most studied semiconductor for environmental clean-up applications due to its unique ability in photocatalyzing various organic contaminants, its chemical inertness, and nontoxicity. TiO2, however, has a few drawbacks to be solved such as reactivity mainly working under ultraviolet irradiation (λ<387 nm)and electron - hole recombination on TiO2. In this study, to extend the absorption range of TiO2 into the visible range and enhance electron - hole separation, we synthesized platinum (Pt) deposited C-TiO2. The presence of Pt as an electron sink has been known to snhance the separation of photogenerated electron-hole pairs and induce the thermal decomposition. The characterization of as-synthesized Pt-C-TiO2 was performed by Transmission Electron Microscopic (TEM), the Brunuer-Emmett-Teller (BET) method, X-ray Diffractometer (XRD), UV-vis spectrometer (UV-DRS), and X-ray Photoelectron Spectroscopy (XPS). In order to estimate the photocatalytic activity of the synthesized materials, the photoelectron Spectroscopy (XPS). In order to estimate the photocatalytic activity of the synthesized materials, the photodegradation experiment of an azo dye (Acid Red 44;C10H7N=NC10H3(SO3Na)2OH)was carried out by using an Xe arc lamp (300 W, Oriel). A 420 nm cut-off filter was used for visible light irradiation. From the results, Pt-deposited C-TiO2 showed a far superior phothdegradation activity to Degussa P25, the commercial product under the irradiation of visible light and enhanced photocatalytic activity of visible-working C-TiO2. This is a useful result into the application for the purification system of dye wastewater using visible energy of sun light.