期刊
DALTON TRANSACTIONS
卷 40, 期 47, 页码 12670-12675出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt10889a
关键词
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资金
- National Basic Research Program of China [2007CB613302]
- National Natural Science Foundation of China [20973102, 51021062, 51002091, 21007031]
- China Postdoctoral Science Foundation [20090461200]
- Independent Innovation Foundation of Shandong University, IIFSDU [2009GN050]
A pure phase of Bi2TiO4F2 nanoflakes with layered Aurivillius structure are synthesized by a simple hydrothermal method. The as-prepared sample is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflectance spectroscopy. The OH radicals produced during the photocatalytic reaction is detected by a photoluminescence (PL) technique. The electronic structure is investigated by DFT calculations. The photocatalytic properties of Bi2TiO4F2 are explored by degradation of Rhodamine B (RhB) and phenol. The results show that Bi2TiO4F2 exhibits much higher photocatalytic performances than Bi4Ti3O12 due to the unique layered structure and the existence of F. F acts as an electron trapper, which enhances the separation of photogenerated electron-hole pairs, and lead to higher photocatalytic activity. Reaction with terephthalic acid demonstrates that OH radicals are formed as a result of UV irradiation of Bi4TiO4F2 in solution, in agreement with the proposed mechanism. Thus, Bi2TiO4F2 can be used as a new efficient photocatalyst.
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