State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, PR China.
Dalton Trans. 2011 Dec 21;40(47):12670-5. doi: 10.1039/c1dt10889a. Epub 2011 Aug 4.
A pure phase of Bi(2)TiO(4)F(2) 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 Bi(2)TiO(4)F(2) are explored by degradation of Rhodamine B (RhB) and phenol. The results show that Bi(2)TiO(4)F(2) exhibits much higher photocatalytic performances than Bi(4)Ti(3)O(12) 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 Bi(4)TiO(4)F(2) in solution, in agreement with the proposed mechanism. Thus, Bi(2)TiO(4)F(2) can be used as a new efficient photocatalyst.
通过简单的水热法合成了具有层状 Auriwillius 结构的纯相 Bi(2)TiO(4)F(2)纳米薄片。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、高分辨率透射电子显微镜 (HRTEM) 和紫外可见漫反射光谱对所制备的样品进行了表征。通过光致发光 (PL) 技术检测光催化反应中产生的 OH 自由基。通过 DFT 计算研究了电子结构。通过 Rhodamine B (RhB) 和苯酚的降解来探索 Bi(2)TiO(4)F(2)的光催化性能。结果表明，由于独特的层状结构和 F 的存在，Bi(2)TiO(4)F(2)表现出比 Bi(4)Ti(3)O(12)更高的光催化性能。F 作为电子捕获剂，增强了光生电子-空穴对的分离，从而导致更高的光催化活性。与对苯二甲酸的反应表明，Bi(4)TiO(4)F(2)在溶液中经 UV 照射会形成 OH 自由基，这与提出的机制一致。因此，Bi(2)TiO(4)F(2)可用作一种新的高效光催化剂。
