Preparations and photocatalytic characterization of tungsten oxide-doped titanium dioxide/carbon composites

• Main Authors: Chih-Hao Mao, 毛志豪
• Other Authors: Shi-Shiun Cheng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/82749271143897459282

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 97 === TiO2 is the most studied photocatalyst. High photocatalytic activity, low cost and easily prepared, but it shows negligible visible-light activity. This researchs mainly enhance the effect of TiO2 photocatalytic activities. Mesoporous titanium dioxide were prepared via sol-gel method, and in the prepared process doped tungsten atoms and carbon coating of photocatalyst was successful to prepared. The synthesized sample was characterized by X-ray Diffraction (XRD), Raman scattering spectroscopy (Raman), Fourier Transform Infrared Spectrometer (FTIR), Brunauer–Emmett–Teller (BET), Thermo Gravimetric analysis (TGA), Field Emission Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The photocatalyic activity of the synthesized composite particles was tested by photodegradation of Methylene Bule (MB) and Methyl Orange (MO) and Rhodamine B under UV illumination (365 nm) and compared with that of commerce photocatalyst P-25, ST-01. The result shows, the first part, doped titanium dioxide has photocatalytic activity such as photodegradations of Methylene Bule, which are much higher than those with pure titanium dioxide. The second part, PVA and tungsten on the same time to improve titanium dioxide, carbon coating of photocatalyst was successfully carried out by heating a powder mixture of poly(vinyl alcohol) and TiO2/WOx under N2 gas flow at temperature above 700 oC. Carbonization method was possessing high adsorbability, and have good adsorption and photodegradation ability to the Methylene Bule.