| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 95 === One of the important ways to enhance photocatalytic efficiency is to prepare catalyst with high surface area. In this work, by dissolving the commercial titanium dioxide (Degussa-P25) and hydrothermal-prepared TiO2 under the alkali condition, followed by hydrothermal treatment at 110 °C for 48 hr, the titanium dioxide nanotubes were successfully made. The products were characterized by transmission electron microscopy (TEM) for morphology, dimensions and size distribution; by X-ray diffraction (XRD) for crystalline phase; and by Brunauer-Emmett-Teller (BET) for surface area. Based on TEM, the as-prepared TiO2 were observed to be tube-shape with inner diameters of 8-11 nm, outer diameters of 10-13 nm, and average length of 80-150 nm. The BET measurement shows large enhancement in the specific surface area from 40-50 m2/g (DP-25) to 110-330 m2/g. From the XRD result, we observe the disappearance of titanium oxide anatase phase and rutile phase.The photocatalytic activity of as-prepared TiO2 was tested in the reaction of methylene blue photodegradation in aqueous solution.
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