论文部分内容阅读
利用含铬(Cr)(VI)废水,采用原位沉淀法制备高效铬酸银(Ag_2CrO_4)/凹凸棒石(ATP)复合光催化剂,通过X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱、紫外可见漫反射光谱、荧光光谱等对其结构和性能进行表征,并以罗丹明B为降解底物,考察其光催化性能。结果表明:加入的凹凸棒石有效控制了Ag_2CrO_4粒子的生长,使其粒径变小;所得复合光催化剂中Ag_2CrO_4的粒子直径约为15 nm,且沉积在凹凸棒石表面;和纯的Ag_2CrO_4相比,Ag_2CrO_4/ATP复合光催化剂的光催化性能和稳定性有较大提高,复合催化剂的光生电子–空穴对可实现高效分离和快速传输。
High performance silver (Ag 2 Cr 4 O) / attapulgite (ATP) composite photocatalysts were prepared by in situ precipitation method using chromium (VI) wastewater and characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Photoelectron spectroscopy, UV-visible diffuse reflectance spectroscopy and fluorescence spectroscopy were used to characterize their structures and properties. Rhodamine B was used as a substrate to investigate its photocatalytic activity. The results show that attapulgite can effectively control the growth of Ag_2CrO_4 particles and decrease the particle size of Ag_2CrO_4 particles. The diameter of Ag_2CrO_4 particles in the composite photocatalyst is about 15 nm and is deposited on the surface of attapulgite. The pure Ag_2CrO_4 phase The photocatalytic performance and stability of the Ag 2 CrO 4 / ATP composite photocatalyst are greatly improved. The photogenerated electron-hole pairs of the composite catalyst can be efficiently separated and transported rapidly.