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用固相反应合成法合成了光催化剂Fe2BiTaO7,通过XRD、SEM、TEM、紫外-可见漫反射等表征方法对其组织结构及光催化性能进行了研究。结果表明Fe2BiTaO7为立方晶系烧绿石结构,空间群为Fd3m,禁带宽度为1.72 e V。通过比较Fe2BiTaO7、P25TiO2、掺氮Ti O2和Bi2In Ta O7的可见光光催化降解罗丹明B,发现Fe2BiTaO7降解效果及催化活性均高于其它催化剂,并且Fe2BiTaO7降解罗丹明B效率是掺氮二氧化钛的1.5倍。Fe2BiTaO7降解罗丹明B的曲线符合一级动力学,一级动力学常数为0.022 93 min-1。研究了罗丹明B可能的降解路径和Fe2BiTaO7在可见光下降解苯酚的效果。Fe2BiTaO7(可见光)光催化剂系统适用于纺织工业废水处理。
The photocatalyst Fe2BiTaO7 was synthesized by the solid-state reaction method. The structure and photocatalytic activity of Fe2BiTaO7 were studied by XRD, SEM, TEM and UV-Vis diffuse reflectance spectroscopy. The results show that the Fe2BiTaO7 is cubic pyrochlore structure with a space group of Fd3m and a forbidden band width of 1.72 eV. The photocatalytic degradation of rhodamine B by Fe2BiTaO7, P25TiO2, nitrogen-doped Ti O2 and Bi2In Ta O7 shows that the degradation efficiency and catalytic activity of Fe2BiTaO7 are higher than those of other catalysts, and the degradation efficiency of Fe2BiTaO7 is 1.5 times that of nitrogen-doped titanium dioxide . The curve of Fe2BiTaO7 degrading rhodamine B conformed to the first-order kinetics, the first-order kinetic constant was 0.022 93 min-1. The possible degradation pathway of rhodamine B and the effect of Fe2BiTaO7 on phenol degradation in visible light were studied. Fe2BiTaO7 (visible light) photocatalyst system is suitable for textile industrial wastewater treatment.