以钛酸丁酯、硝酸铋和硝酸银为原料,FTO为基底,采用水热法结合超声沉积法合成了Ag2 O/TiO2异质结光催化剂.采用场发射扫描电子显微镜(FESEM)、X射线衍射仪(XRD)、紫外-可见吸收光谱(UV-Vis)分析测试手段对样品的形貌和结构进行了表征.结果表明,Ag2O/TiO2异质结是由直径约200 ～ 300 nm的TiO2纳米棒镶嵌着Ag2O纳米颗粒组成,与TiO2纳米棒阵列相比,Ag2O/TiO2异质结在可见光区有明显的光吸收.Ag2O/TiO2异质结的光催化效率明显提高.尤为重要的是,经光处理后,最终得到稳定的Ag-Ag2O/TiO2三元体系,并对Ag-Ag2 O/TiO2三元体系提高光催化稳定性和活性的机理进行了分析.
Ag2O/TiO2 heterojunction photocatalysts were synthesized on FTO through hydrothennal method and ultrasonic precipitation method with precursors (Ti (Obu)4,Bi (NO3) 2 and AgNO3).The structures and morphologies of Ag2O/TiO2 heterostructure were investigated by field emission scanning electron microscopy (FESEM),X-ray diffraction (XRD) and UV-Vis spectra.The results indicate that Ag2O/TiO2 heterostructures consist of TiO2 nanorod arrays decorated with 200-300 nm Ag2O nanoparticles.Compared to the pure TiO2 nanorod arrays,the Ag2O/TiO2 heterostructures exhibit obviously absorption under visible light irradiation.Ag2O/TiO2 heterojunction photocatalytic activity improves significantly.Further,through visible light irradiation treatment,Ag-Ag2O/TiO2 composite stability system were fabricated,the mechanism for improving photocatalytic stability and activity of Ag-Ag2O/TiO2 composite system was also proposed.
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