Study of photocatalytical reaction of methylene blue on metal nanoparticles modified-TiO2 film

• Main Authors: Yang - chi Tsung, 楊繼宗
• Other Authors: Chung - Chin Yu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/63648913183186103021

碩士 === 萬能科技大學 === 工程科技研究所 === 100 === Blending the metal in the TiO2 thin film can enhance the photocatalytic efficiency of the TiO2 thin film and the metal beneath nanometer can enhance the photocatalytic efficiency also. So this research use the nano-metal (gold, silver, platinum) doping on titanium dioxide (TiO2) thin film to compare the photocatalytic efficiency between the nano-metal modified TiO2 film and original TiO2 film, and discuss different factors how to influence photocatalytic decomposition of the modified TiO2 film. These factors include process of the thin film produced, different kinds of metals, concentration of metal, oxidation-reduction cycles (ORC) and the pH value. The examination of metalliferous solution may use UV- visible (UV-Vis) light to determine its metal characteristic peak and the specific wavelength range. The identity of TiO 2 thin film materials may use the distinction scans type electron microscope (SEM) to examine its contours of surface, the metal and the TiO2 content proportion being determined by ultimate analysis (EDS), the oxide of element by photoelectron spectroscope (XPS), diffraction spectroscope (XRD) uses for to the crystal structure analysis finally penetrates in the type electron microscope (TEM) observing the metal size of solution. Research of the photocatalytic decomposition is that different TiO2 thin film was placed in the photocatalytic reactor and photodegradated methylene blue solution to explore the different photolysis efficiency of TiO2 films. The experiment shows that nano silver solution had the most outstanding photocatalytic efficiency. About the redox state, the solution of gold salt has a better catalytic efficiency than gold nanoparticles. Concentration of metalliferous solution will influence the photocatalytic efficiency of TiO2 thin film that 500 ppm nano-silver solution had the highest photocatalytic efficiency. The pH value of solution will also influence the photocatalytic efficiency of TiO2 thin film that pH=8 conditions had the highest photocatalytic efficiency. By above conclusions, the nano-metal doping TiO2 thin film can effectively enhance the photocatalytic efficiency of TiO2 thin film. Therefore, we can use similar procedure to produce better TiO2 film that can expand the utility of TiO2 thin film in sewage disposal.