TiO2纳米管的改性及光助催化性能研究

利用水热法制备了两种TiO2纳米管催化剂，用不同浓度硫酸对制备得到的TiO2纳米管进行酸化。结合XRD、SEM、TEM、DRS等手段对制备得到的样品进行物理结构和表面特性分析。结果表明，水热法制备得到的TiO2纳米管径为15nm左右，壁厚2—3nm，长度为40-100nm。以酸性橙Ⅱ为目标物考察了TiO2纳米管及其被硫酸酸化过的TiO2纳米管在石英玻璃反应器的光催化氧化性能。结果表明，在相同的条件下酸化的TiO2纳米管催化活性要远远高于未酸化的TiO2纳米管，这可能是因为S—O键具有很强的诱导效应，使得表面Ti^4＋的Lewis酸性增强，使光生电子一空穴对的分离效率提高，促进光催化反应的进行，即提高了TiO2纳米管的光催化性能。

Study on nanotube's change in nature and photocatalytic capacity

The hydrothermal method is used to obtain two types of TiO_2 nanotube catalysts,to which the vitriol with different density is applied to acidify them.Then,the final sample products are analyzed in their physical structure and surface feature with the help of XRD,SEM,TEM,and DRS.As a result,the TiO_2nanotube obtained by hydrothermal method is around 15nm in diamerer,2~3 nm in tube wall thickness and 40~100 nm in length.In quartz glass reactor,the photocatalytic capacity of TiO_2 nanotube and acidified nanotube by vit6riol is examined by using Acid Orange II.The result shoes that under the same condition the acidified TiO_2 nanotude is more catalytic than the non-acidified one most probably because S=O is very inductive and the surface Ti~(4+) is stronger in Lewis acidity,so that TiO_2 nanotube's photocatalytic capacity is improved.