Preparation Of TiO₂ Multi-nanostructure And Its Structural Characterization

Due to the strong photocatalytic activity, the high efficiency of photoelectric conversion, complete degradation for the organic matter and little secondary pollution, TiO₂ has been widely used in photocatalytic decomposition of water, wastewater treatment, air purifier, prevent mist-self-cleaning coating, antibacterial materials, etc. In recent years, a lot of researches were carried out in the field of expanding TiO₂ applications, improving their catalytic properties.In the present work, TiO₂ nanomaterials were prepared from Ti-Cu-Pd amorphous alloy by chemical corrosion. The properties of as-formed TiO₂ nanomaterials were investigated systematically. Then the F- ions were employed as the active agent in the reaction to improve the structure and performance of the TiO₂ nanomaterials.We focus on the preparation method and the role of the noble metal Pd in formation of the TiO₂ nanomaterials and their performance. The Pd-TiO₂ was characterized by scanning electron microscopy?SEM?, transition electron microscopy?TEM? and X-ray diffraction?XRD?. The results show that the TiO₂ nanomaterials prepared by amorphous alloy with Pd would expose more high energy?001? facets, exhibit higher surface activity. Furthermore, the TiO₂ nanomaterials prepared by Ti-Cu-Pd amorphous alloys exhibit higher photocatalytic activity than the commercial P25 and the TiO₂ nanomaterials prepared by Ti-Cu amorphous alloy.With the addition of low-concentration F- ions in the etching solution, the phase of TiO₂ nanomaterials changed from rutile type to anatase type. When high-concentration F- ions were added in the etching solution the?NH₄?_0.3TiO_1.1F_2.1 would be formed. The?NH₄?_0.3TiO_1.1F_2.1 would transformed to the single anatase phase after the calcination. The addition of F- improves the photocatalytic activity of the as-formed TiO₂ nanomaterials for degradation of the RhB under UV-Vis light.