三维分级花球结构Bi_2WO_6的制备及其光催化性能研究

Preparation and Photocatalytic Properties of Three-Dimensional Hierarchical Bi_2WO_6 with Flower-Like Structures

以L-赖氨酸为模板剂,采用水热法成功制备出三维分级花球结构Bi_2WO_6光催化剂。采用X射线衍射(XRD)、扫描电镜(SEM)等测试方法对所制备样品进行了表征。研究了水热反应过中反应温度、时间及L-赖氨酸添加量等因素对样品形貌的影响,提出三维分级花球结构Bi_2WO_6的可能形成机理。此外,以罗丹明B溶液为模拟染料废水,在模拟太阳光照射下考察了样品的光催化活性,结果表明:以L-赖氨酸为模板剂所制备的花球形Bi_2WO_6(L-BWO)具有较高的光催化活性,与不添加模板剂情况下所制备的片状Bi_2WO_6(BWO)相比,L-BWO光催化剂的降解效率约是BWO的1.5倍。

Three-dimensional hierarchical Bi_2WO_6 with flower-like structures were successfully prepared by hydrothermal method using L-lysine as template agent. The as-prepared samples were characterized by X-ray diffraction( XRD),scanning electronic microscope( SEM) techniques,etc. The effects of hydrothermal temperature,reaction time and amounts of L-lysine on the morphologies of Bi_2WO_6 were investigated and a possible formation mechanism for three-dimensional hierarchical Bi_2WO_6 microspheres was proposed. Moreover,the photocatalytic activities of the samples were evaluated on the degradation of rhodamine B solution( a simulated dye wastewater) under simulated solar irradiation. The results indicate that the flower-like Bi_2WO_6microspheres( BWO-L) obtained in the presence of L-lysine exhibited enhanced photocatalytic activity. In comparison with plate-like Bi_2WO_6( BWO) obtained in the absence of template agent,the photodegradation efficiency of BWO-L sample was about 1. 5 times higher than that of BWO sample.