Citation: LIN Xue, YU Li-Li, YAN Li-Na, YAN Yong-Sheng, GUAN Qing-Feng, ZHAO Han. Controllable Synthesis and Photocatalytic Activity of Layered, Flowerlike, and Rodlike Bismuth Titanate Nanostructures[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(11): 2415-2421. doi: 10.3969/j.issn.1001-4861.2013.00.346
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Layered, flowerlike, and rodlike bismuth titanate (Bi4Ti3O12, BIT) nanostructures were synthesized via the controllable hydrothermal method. The phase structures and morphologies were measured by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). XRD patterns demonstrate that the as-prepared samples are of layered-perovskite structure. FESEM shows that BITcrystals can be fabricated in different morphologies by simply manipulating the reaction parameters of hydrothermal process. The UV-Vis diffuse reflectance spectra (UV-Vis DRS) reveal that the band gaps of BIT photocatalysts are 2.63~2.95 eV. The as-prepared BIT photocatalysts exhibit higher photocatalytic activities in the degradation of methyl orange (MO) under visible light irradiation (λ>420 nm) compared with traditional N-doped TiO2 (N-TiO2). Layered BIT nanostructures show the highest photocatalytic activity. Up to 95.0% MO is decolorized after visible light irradiation for 360 min. In addition, the reason for the difference in the photocatalytic activities obtained at different conditions was studied based on the structures and morphologies.
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