| Summary: | 碩士 === 元智大學 === 化學工程與材料科學學系 === 98 === The different morphologies of pure rutile titania nanorods which can photodegrade organic were prepared at low temperatures, and loaded with silver to increase the photocatalytic effects. Titanium tetrachloride was used as a precursor and then mixed with ethanol and water for synthesis of titania nanorods. Parameters, involved in nanorods fabrication, such as reaction time, temperature and molar ratio, were studied and the synthesized nanorods were characterized by using different analytical instruments. From the X-ray diffraction results, we found the nanorods are rutile titania oxide crystal structures. Different morphologies of the nanorod samples were fabricated by the control of the operating parameters, such as flower-like, pinecone-like and hydrangea-like, observed by FESEM. The high specific surface area was obtained at low temperature and high [TiCl4] and [ethanol] by N2 adsorption-desorption isothermal. Photocatalysis of all these samples were tested and demonstrated the photocatalytic performance. The modification of the nanorod samples, mixed with 1% AgNO3, and heated in H2 environment at 350℃, can shift the light absorption to visible light region. Moreover, the modified nanorode sample demonstrated the photocatalytic performance more effectively.
Keywords : Titania nanorods , Rutile crystal , Silver, Photocatalysis, Sol-gel method.
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