复合TiO2纳米颗粒的TiO2纳米棒阵列的制备、表征及光催化性能研究

摘要

从提升光生电荷分离效率的角度出发,先采用一步水热法制备了单晶TiO2纳米棒阵列,再经简单的常温化学浴处理在其表面复合TiO2纳米颗粒,获得了核壳结构的TiO2纳米棒阵列-TiO2纳米颗粒(TNR@TNP),通过XRD、SEM、TEM对其结构和形貌进行了表征,并对其室温下降解气态苯的光催化性能进行了评价,通过光电流测试和XPS表征对其光催化降解机理进行了研究.结果表明,化学浴浸泡30 h的TNR@TNP的光催化降解气态苯的活性最强;TiO2纳米颗粒表面的氧空位缺陷能够捕获空穴,将空穴钉扎在其表面,而电子则沿着TiO2纳米棒阵列方向迁移至FTO导电玻璃,从而提升光生电荷分离效率,使得TNR@TNP的光催化活性明显增强.%From the perspective of promoting the separation efficiency of photo-induced charge,we firstly prepared single crystal TiO2 nanorod arrays by a one-step hydrothermal method,then fabricated TiO2 nanoparticles onto TiO2 nanorod arrays by a chemical bath treatment method at room temperature to obtain core-shell TiO2 nanorod arrays-TiO2 nanoparticles(TNR@TNP).We characterized their structures and morphologies by XRD,SEM,and TEM.Moreover,we evaluated the photocatalytic degradation property of TNR@TNP against gas benzene at room temperature,and investigated the photocatalytic degradation mechanism by photocurrent test and XPS analysis.Results indicated that TNR@TNP treated by a chemical bath treatment for 30 h showed the best photocatalytic degradation activity against gas benzene.The holes were trapped on the surface of TiO2 nanoparticles by oxygen vacancy defects,and the electrons transfered to FTO conducting glass along TiO2 nanorod arrays.Therefore,the separation efficiency of photo-induced charge were enhanced,and the photocatalytic activity of TNR@TNP was significantly improved.