Hydrothermal Synthesis and Photocatalytic Properties of Bi2WO6

Ying LIU, Wei-Min WANG, Zheng-Yi FU, Hao WANG, Yu-Cheng WANG, Jin-Yong ZHANG
2011 Journal of Inorganic Materials  
摘 要: 水热法合成了 Bi 2 WO 6 粉体, 并采用 XRD、FESEM 及 UV-Vis 分光光度计对样品进行表征, 研究了不同合 成条件对产物形貌和催化性能的影响. UV-Vis 漫反射谱表明产物在紫外和可见光区域均有吸收. 样品的光催化性 能通过降解 RhB 溶液来评价. 结果表明: 180℃, pH=2 下合成 24h 获得的 Bi 2 WO 6 紫外光催化性能最好, 反应速率常 数为 0.03688/min. 还讨论了不同 pH 值对合成样品催化性能的影响. 催化剂的稳定性实验通过 180℃, pH=2 下合成 24h 获得的 Bi 2 WO 6 多次催化实验来评估, 结果表明 4 次循环实验后, 样品的催化性能未有明显地衰减. 在可见光下 照射 150min, 催化剂对染料的降解率达到 38%. 关 键 词: Bi 2 WO 6 粉体; 水热合成; 光催化性能; 罗丹明 B 中图分类号: TQ135 文献标识码: A Abstract: Series of bismuth tungstate (Bi 2 WO 6 ) catalysts were
more » ... d through simple hydrothermal route and characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and UV-Vis diffuse reflectance spectroscope (DRS). The effects of synthesis conditions on the morphologies and properties of products were studied. UV-Vis diffuse reflectance spectra indicated that the samples had absorption in both UV and visible light areas. Their photocatalytic activities were determined by photodegradation of Rhodamine B (RhB) under UV and visible light irradiation (λ> 420 nm). The results indicated that sample reacted at 180℃ for 24h (pH=2) had the best photocatalytic activities, with reaction rate constant k of 0.03688/min. The stability of photocatalysts was estimated, no obvious loss of photocatalytic property was detected after four cyclic tests. After 150min visible light irradiation, the degradation rate of dye to the Bi 2 WO 6 reacted at 180℃ for 24h (pH=2) reached 38%.
doi:10.3724/sp.j.1077.2011.01169 fatcat:7xd6euzztzgtzdvii6vsst7amu