TiO_(2)/Bi_(2)WO_(6)复合光催化剂的制备及光催化性能研究

Preparation and photocatalytic properties of TiO_(2)/Bi_(2)WO_(6) composite photocatalyst

TiO_(2)/Bi_(2)WO_(6)异质结是当前最具潜力的一种可见光响应半导体光催化剂。以富含缺陷的TiO2纳米带为基体,采用水热法,诱导Bi2WO6在基体缺陷位点进行异质生长,从而合成具有异质结构的TiO_(2)/Bi_(2)WO_(6)复合材料。利用XRD、SEM、UV-Vis等技术,分析了基体表面缺陷、Bi2WO6负载量对TiO_(2)/Bi_(2)WO_(6)复合材料微观结构和性能的影响。结果表明,在基体表面引入缺陷,可以使TiO_(2)/Bi_(2)WO_(6)复合材料在可见光下对有机污染物Rh B的降解速率提高约50%。Bi2WO6负载量为0.12时的TiO_(2)/Bi_(2)WO_(6)复合材料,在可见光下,辐照6 min后对Rh B的降解率达99.3%,辐照30 min后对MB的降解率达99.7%,辐照15 min后对TC-HCl的降解率达87.7%。

TiO_(2)/Bi_(2)WO_(6) heterojunction is one of the most potential visible light responsive semiconductor photocatalysts.In this paper,TiO_(2)/Bi_(2)WO_(6) composites with heterogeneous structure are synthesized by hydrothermal method with TiO2 nanobelts rich in defects as the matrix.The effects of matrix surface defects and Bi2WO6 loading on the microstructure and properties of TiO_(2)/Bi_(2)WO_(6) composites are analyzed by XRD,SEM and UV-Vis techniques.The results show that the degradation rate of organic pollutant Rh B in TiO_(2)/Bi_(2)WO_(6) composites can be increased about 50%by introducing defects on the surface of the matrix.When the loading of Bi2WO6 is 0.12,the degradation rates of Rh B,MB and TC-HCl are 99.3%,99.7%and 87.7%respectively after irradiation for 6 min,30 min and 15 min.