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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。
A series of Ti O2 nanotubes were prepared by controlling the oxidation reaction time by electrochemical anodic oxidation. The morphology, phase structure and compositional elements of Ti O2 nanotubes were analyzed by SEM, XRD and XPS. Photoelectrocatalysis of Ti O2 nanotubes and Photocatalytic Degradation of Reactive Organic Dyes. The results show that the increase of the oxidation reaction time leads to the increase of the diameter and the length of the TiO 2 nanotubes, thus accelerating the generation efficiency of photogenerated electron-hole pairs and increasing the catalytic activity. However, when the oxidation time is too long, the surface of the TiO 2 nanotube Of regularity decreased, surface defects increased, resulting in photo-generated electron - hole recombination rate increased, but to reduce the catalytic activity; suitable anodization time of 120min.