La^(3+)-SiO_2掺杂纳米TiO_2的合成及其光催化降解甲基橙的研究  

Synthesis of La^(3+)-SiO_2 Doped Nano-TiO_2 and Photo catalytic Degradation of Methyl Orange

作　　者：胡红民[1] 俞建长[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350108

出　　处：《中国稀土学报》2009年第5期629-634,共6页Journal of the Chinese Society of Rare Earths

基　　金：福建省高新技术项目基金项目(2004H008)资助

摘　　要：以三嵌段非离子表面活性剂P123为模板,采用水热法合成了La3+-SiO2掺杂纳米TiO2,通过X射线衍射(XRD)、红外光谱(FT-IR)、紫外-可见漫反射吸收光谱(DRS)等手段,考察了La3+-SiO2掺杂纳米TiO2的结构与光学特性。实验结果表明,La3+和SiO2掺杂使TiO2的晶粒在生长过程中受到阻碍。Ti-O-Si键和Ti-O-La键的形成抑制了金红石相的形成和晶粒长大,提高了TiO2的热稳定性,有利于获得高纯度锐钛矿相纳米TiO2。La3+-SiO2掺杂将TiO2的光响应范围拓宽至可见光区,提高了纳米TiO2的光催化性能。与纯纳米TiO2相比,La3+-SiO2掺杂纳米TiO2光催化降解甲基橙的性能显著提高。La^3 ＋ -SiO2 doped nano-TiO2 was synthesized via hydrothermal process with tri-block non-ion surfacrant P123 as template. The structures and optical properties of the synthesized samples were characterized via XRD, DRS, FT-IR etc. The results showed that the grain growth of TiO2 was hindered by La^3＋ and SiO2 doping. The formation of Ti - O - Si bond and Ti -O -La bond suppressed the formation of the rutile phase and the growth of titanium dioxide crystals, andimproved thermal stability of TiO2, therefore obtained high purity of anatase phased nano-TiO2. The spectra response range of TiO2 was extended to visible light substantially by La^3 ＋-SiO2 doping, then photocatalytic performance was improved effectively. Compared with pure nano-TiO2, the performance of La^3＋-SiO2 doped nano-TiO2 which photocatalyticly degraded methyl orange was increased signifieantly.

关 键 词：纳米TIO2 La3+-SiO2掺杂 光催化降解 稀土 

分 类 号：TQ134.11[化学工程—无机化工]