Fe(Ⅲ)团簇表面修饰Bi_2WO_6及其界面电子转移增强催化性能机制

Fe( Ⅲ) Clusters Modification on the Surface of 3D Bi_2WO_6 Nanostructures with Enhanced Photocatalytic Activities via the Interface Charge Transfer

采用水热法制备了分级结构的Bi_2WO_6微球,在此基础上采用回流法将Fe(Ⅲ)沉积在其表面,获得了系列Fe(Ⅲ)修饰的Fe(Ⅲ)/Bi_2WO_6催化材料,采用XRD、UV-Vis-DRS、SEM等测试技术对其组成、形貌和能带结构进行表征分析。以偶氮染料罗丹明B (RhB)为模拟污染物对其活性进行测试。活性测试结果表明,Fe(Ⅲ)表面修饰增强了Bi_2WO_6光催化剂RhB的对吸附对能力,提高了光生电子-空穴的分离能力并有效拓宽了Bi_2WO_6光催化材料对可见光的吸收范围,促进了·OH和·O_2^-的产生,Fe(Ⅲ)/Bi_2WO_6的催化活性比Bi_2WO_6增强了约2. 4倍。

Hierarchical Bi2WO6 microspheres were prepared by hydrothermal method.Fe(Ⅲ) was deposited on its surface by a following reflux method.The resulted Fe(Ⅲ)/Bi2WO6 catalytic materials were characterized by XRD,UV-Vis-DRS,SEM to investigate its composition,morphology and band structure.Rhodamine B (RhB) was selected as model pollutant to evaluate the photocatalytic activity of as-prepared Fe(Ⅲ)/Bi2WO6 photocatalysts.The results revealed that Fe(Ⅲ) loading significantly enhance the adsorption ability of Bi2WO6 photocatalyst,improve the separation ability of photogenerated electrons and holes,broaden the visible-light responsive region as well.Furthermore,Fe(Ⅲ) loading promote the generation of both ·OH and ·O 2^-.The photocatlaytic activity experimental results show that the catalytic activity of Fe(Ⅲ)/Bi 2 WO 6 is about 2.4 times higher than that of Bi2WO6 for photocatalytic degradation of Rhodamine B .