表面活性剂对水热制备钨酸铋形貌及光催化性能的影响

通过简单水热制备了大小均一,直径约为2.5 μm的球状Bi2WO6粉体.系统研究表面活性剂SDS和PVP对水热制备Bi2WO6光催化剂的影响.利用XRD,EDS,SEM,TEM和DRS等分析技术对催化剂的组成、形貌、比表面积和带隙宽度等进行了表征.实验结果表明,表面活性剂对催化剂的形貌和催化活性有较大影响.在水热制备过...

Influence of surfactant on the morphology and photocatalytic activity of Bi_2WO_6 by hydrothermal synthesis

The flower-like microsphere Bi₂WO₆ with an average diameter of 2.5 μm is synthesized by a simple hydrothermal method in the presence of surfactant sodium dodecyl sulfate (SDS) or polyvinylpyrrolidone (PVP). The crystalline phase, compositions, morphology, microstructure, surface area and band gap energy of the Bi₂WO₆ are characterized by X-ray diffraction, X-ray energy-dispersive spectrum, scanning electron microscopy, transmission electron microscopy and absorption spectra. It is found that surfactant has a significant influence on the microstructure and properties of the samples. The surfactant SDS enhances the surface area and photocatalytic activity of Bi₂WO₆, while the surfactant PVP has an opposite effect. Under Xe lamp irradiation, the Bi₂WO₆ sample prepared in the presence of SDS can degrade dye rhodamine B (RhB) effectively.