水热法合成了Bi2WO6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Bi2WO6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Bi2WO6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%.
Series of bismuth tungstate (Bi2WO6) catalysts were synthesized 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 Bi2WO6 reacted at 180℃ for 24h (pH=2) reached 38%.
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