中文摘要：

采用水热法，通过调节前驱体溶液中的HNO3浓度合成了不同形貌的Bi2WO6。利用X射线衍射、Raman光谱、扫描电子显微镜和紫外–可见漫反射谱对样品进行表征,探讨了Bi2WO6的形成机理。以氙灯模拟太阳光,考察了样品对罗丹明B（Rh B）的光催化性能并分析了光催化机理。结果表明：改变前驱体中的HNO3浓度对Bi2WO6样品的物相组成和晶体结构没有明显影响,但是对其形貌和光催化性能有显著影响。当前驱体溶液中的HNO3浓度为0.2 mol/L时,所制备的花状微球Bi2WO6在氙灯辐射120 min后对Rh B的降解率达到82.5%;在3次回收利用后仍表现出了良好的稳定性。

英文摘要：

Bi2WO6 particles with various morphologies were prepared by a hydrothermal method. The effect of HNO3 concentration in the precursor solution on the morphology and photocatalytic performance of Bi2WO6 particles was investigated. The as-synthesized Bi2WO6 samples were characterized by X-ray diffraction （XRD）, Raman spectroscopy, scanning electron microscopy, specific surface area measurement and UV-Vis diffuse reflection spectroscopy, respectively. The formation mechanism of Bi2WO6 particles was discussed. The photocatalytic activity of the Bi2WO6 was evaluated via the degradation of rhodamine B（RhB） under simulated sunlight （xenon lamp）. The photocatalytic mechanism of Bi2WO6 was also analyzed. The results reveal that the phase composition and the crystal structure of Bi2WO6 hardly change, but the morphology and the photocatalytic efficiency of Bi2WO6 distinctly change when the concentration of HNO3 in the precursor solution varies. The as-prepared flower-like Bi2WO6 microspheres with 0.2 mol./L HNO3 in the precursor solution show the maximum photocatalytic activities, and the photodegradation efficiency is 82.75% within 120 rain irradiation under simulated sunlight. Moreover, the sample is still stable after using for three recycles.