铈掺杂二氧化钛纳米管的光催化性能

Photocatalytic Property of Cerium-doped Titanium Dioxide Nanotubes

摘要: 利用溶胶-凝胶法,以多孔有序阳极氧化铝膜为模板制备掺杂稀土铈的二氧化钛纳米管,用场发射扫描电子显微镜、X射线衍射仪和比表面仪对其进行表征;并以甲基橙为降解物,对未掺杂的二氧化钛纳米粉、纳米管以及掺杂铈的二氧化钛纳米粉和纳米管进行了光催化降解性能研究,并对降解机理进行了分析.结果表明：适量的掺杂有利于提高二氧化钛纳米管的光催化性能,提高对甲基橙的降解率;掺杂存在一个最佳量,本试验条件下为铈与钛的摩尔数比值在2%时,掺杂的二氧化钛纳米管光催化性能优于掺杂的纳米粉,在光照150 min后,甲基橙的降解率达80%以上.

Abstract: The cerium-doped titanium dioxide nanotubes were prepared by sol-gel method using porous anodic alumina as template.The samples were characterized by means of SEM,XRD and BET.The photocatalytic property of titanium dioxide nanotubes and nanopowders were stutied by degrading the methyl orange solution.The results show that appropriate content of cerium can effectively enhance the photocatalytic activity of TiO2 nanotubes.There is an optimal doped quantity,which is about 2%(mol ratio of Ce and Ti) under this test condition.The photocatalytic property of cerium-doped nanotubes is better than that of cerium-doped nanopowders.The degradation rate is more than 80% after 150 min light esposure.