【摘要】 采用电化学阳极氧化方法,通过控制氧化反应时间制备了一系列Ti O2纳米管,采用SEM、XRD和XPS分别对Ti O2纳米管的形貌、物相结构和组成元素进行了分析,并研究了Ti O2纳米管的光电催化及光催化降解有机染料的反应活性。结果表明,氧化反应时间的增长会导致Ti O2纳米管的管径和长度增加,从而加快光生电子-空穴对的生成效率,提高催化活性;但氧化时间过长时会使Ti O2纳米管表面的规整度下降,表面缺陷增多,致使光生电子-空穴对的再结合速率提高,反而使催化活性降低;适宜的阳极氧化时间为120min。更多还原

【Abstract】 A series of Ti O2 nanotubes were prepared by anodizing method in different oxidation time. The morphology, crystal structure and the element composition of these Ti O2 nanotubes were characterized by SEM, XRD and XPS, respectively. The corresponding photoelectron-catalytic and photocatalytic performance of the Ti O2 nanotubes were studied by the photo-current density measurement and the photo-degradation of Rh B. The re-sults showed that the optimized anodization time was 120 mins, at which the incident photon to current conversion efficiency(IPCE)of the Ti O2 nanotubes reached 18%, and the reaction rate constant of the photocatalytic degradation of Rh B reached 6 ×10-3min-1.更多还原