Synthesis of F,B-codoped Titanium Oxide - Rutile and Catalytic Study
| Autor: | Lin,Yiwen, 林怡彣 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 Titanium (IV) oxide(TiO2) photocatalytic technology has provided an effective and promising means for the remediation of environmental pollutants with low concentrations in air and water. Titanium dioxide has been used widely due to its low cost, photostability and non-toxicity. However, its wide application is still retarded by the low efficiency of the photo-oxidative process because TiO2 can be considered as an active photocatalyst only under ultraviolet (UV) light (wavelength < 387 nm). Therefore, in this study we reported the synthesis of doped TiO2 using a modified sol-gel method with trifluoroacetic anhydride and boric acid as the F and B sources, and the stimulation of photocatalytic activity of the F-doped and F, B-codoped TiO2 under visible light. The TiO2 catalyst was characterized by UV/VIS spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction method (XRD), Raman spectroscopy analysis and scanning electron microscope (SEM). In this study, the F-doped and F,B-codoped TiO2 could be found that the gain sizes were large and the powder properties changed with the increasing of temperature. The result of XPS spectra showed that the F and B were doped into the lattice TiO2. After cacination, the F-doped TiO2 samples(molar ratio of F to Ti=6:4) show rutile phase below700℃, but the FB co-doped TiO2 samples(molar ratio of F to Ti=10:90，B to Ti=0.01:1) have rutile phase till 700℃. The evidence showed the phenomenon of red shift for these modified doped TiO2 samples. In photocatalytic degradation experiments of methylene blue, the modified TiO2 photocatalysts show better photoactivities than those of the pure and P25 titanium (IV) oxide. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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