稀土掺杂TiO_2纳米线阵列的可见光催化性能  

Photocatalysis of Rare-Earth-Doped TiO_2 Nanowire Arrays

作　　者：李改兰[1,2] 田玉明[1] 李昊昉[3] 赵媛媛[1] 

机构地区：[1]太原科技大学材料学院,太原030024 [2]太原城市职业技术学院,太原030027 [3]首都师范大学,北京100048

出　　处：《太原理工大学学报》2012年第3期264-268,共5页Journal of Taiyuan University of Technology

基　　金：山西省科技厅软科学基金资助项目(2009041018-03);太原科技大学博士项目启动资金(200726)

摘　　要：采用溶胶-电泳沉积法在多孔阳极氧化铝模板上制备了TiO2光催化纳米线,合成了具有高比表面积的糖葫芦状M/TiO2(M代表La3+、Ce3+、Nd3+)纳米线阵列体系。采用SEM对样品进行了表征,表明M/TiO2纳米线阵列保持了模板的有序性;对甲基橙的可见光降解实验表明,稀土金属离子掺杂TiO2纳米线阵列体系具有非常优良的可见光催化性能;紫外-可见吸收光谱测试表明,La3+、Ce3+、Nd3+掺杂增强了TiO2在可见光区域的吸收能力,吸收带边红移至可见光区,未掺杂的TiO2禁带宽度为3.24eV,掺La3+、Ce3+、Nd3+的M/TiO2禁带宽度分别减小至2.6eV、2.8eV、2.0eV,这和光催化性能是大致相对应的。Sol-electrophoresis deposition was used to prepare photocatalytic TiO2 nanowires on highly ordered porous anodis alumina template.The arrays of M/TiO2（M=La3＋,Ce3＋,Nd3＋） nanowire with the shape of string of candid haws were also prepared,which had high specific surface area.The characterization by scanning electron microscopy shows that the nanowires kept the orderliness of the template.The visible photodegradation of methyl orange solution shows that the rare-earth-doped TiO2 nanowire arrays exhibited excellent photocatalytic property.The UV-vis absorption measurement indicates that rare-earth doping by La3＋,Ce3＋ or Nd3＋ increased the absorption in visible region,and red-shifted the absorption edge to visible region,the bandgap of undoped TiO2 was 3.24 eV,while that of M/TiO2 for La3＋,Ce3＋ and Nd3＋ was decreased to 2.6,2.8 and 2.0 eV,respectively,in accordance with photocatalytic property.

关 键 词：溶胶-电泳沉积法 TiO2纳米线阵列 稀土金属离子掺杂 光催化性能 

分 类 号：TB383[一般工业技术—材料科学与工程]