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采用水热法,通过调节前驱体溶液中的HNO_3浓度合成了不同形貌的Bi_2WO_6。利用X射线衍射、Raman光谱、扫描电子显微镜、比表面积分析仪和紫外–可见漫反射谱对样品进行表征,探讨了Bi_2WO_6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HNO_3浓度对Bi_2WO_6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HNO_3浓度为0.2 mol/L时,所制备的花状微球Bi_2WO_6在氙灯辐照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。
Hydrothermal method was used to synthesize Bi_2WO_6 with different morphologies by adjusting the concentration of HNO_3 in the precursor solution. The samples were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, surface area analyzer and UV-Vis diffuse reflectance spectroscopy to discuss the formation mechanism of Bi_2WO_6. The xenon lamp was used to simulate the sunlight, the photocatalytic activity of the sample on rhodamine B (Rh B) was investigated and the photocatalytic mechanism was analyzed. The results show that changing the concentration of HNO3 in the precursor has no obvious effect on the phase composition and crystal structure of Bi_2WO_6, but it has a significant effect on the morphology and photocatalytic activity. When the concentration of HNO_3 in the precursor solution was 0.2 mol / L, the degradation rate of Rh B reached 82.5% after irradiated with xenon lamp for 120 min, and the flower-like microspheres Bi_2WO_6 still showed after 3 times of recycling A good stability.