Fe_2BiTaO_7纳米催化剂的组织结构及光催化性能（英文）

Structural and Photocatalytic Properties of Fe_2BiTaO_7 Nanocatalyst

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。

Fe2BiTa07 powder photocatalyst was synthesized by a solid state reaction method. The structural and photocatalytic properties of Fe2BiTaO7 were characterized by XRD, SEM, TEM and UV-Vis diffuse reflectance spectroscopy. The results show that Fe2BiTaO7 crystallizes with the pyrochlore-type structure, cubic crystal system and space group Fd3m. The estimated band gap of Fe2BiTaO7 is 1.72 eV. The photocatalytic degradation of rhodamine B over FezBiTaO7, P25 TiO2, N-doped TiO2 and Bi2InTaO7 was investigated under visible light irradiation. The photocatalytic efficiency with Fe2BiTaO7 catalyst is 1.5 times of N-doped TiO2 catalyst after 140 minutes under visible light irradiation. FezBiTaO7 has higher visible-light photocatalytic performance and shows much better aetivity than that of other photocatalysts. The photocatalytic degradation of rhodamine B follows the first-order reaction kinetics, and the first-order rate constant is 0.022 93 min^-1 for FezBiTaO7. The possible photoeatalytic degradation pathway of rhodamine B under visible light irradiation is suggested. In addition, the photocatalytic degradation of phenol over Fe2BiTaO7 catalyst was investigated under visible light irradiation. Fe2BiTaO7 （visible light） photocatalysis system is confirmed to be suitable for textile industry wastewater treatment.