低温燃烧合成掺杂纳米TiO_2的光吸收和光催化性能  

Investigation of Light Absorption and Photocatalytic Performance of Doped-Titania by Low Temperature Combustion Synthesis

作　　者：刘中清[1] 周艳平[1] 葛昌纯[1] 

机构地区：[1]北京科技大学特种陶瓷粉末冶金研究开发中心,北京100083

出　　处：《稀有金属材料与工程》2006年第A02期104-108,共5页Rare Metal Materials and Engineering

摘　　要：以TiCl4为前驱体,采用低温燃烧合成工艺制备了同时掺杂Zn2+、Fe3+、Ce4+的纳米TiO2粉体,用紫外-可见光漫反射光谱表征粉体的光吸收特性,以亚甲基蓝为目标污染物研究了粉体在可见光辐射下的光催化活性;详细研究了Fe／Ce(mol)、(Fe+Ce)／Ti(mol)、柠檬酸／Ti(mol)、煅烧温度、煅烧时间等对产物光吸收带隙的影响。结果表明,通过改变合成条件可实现对掺杂二氧化钛粉体光吸收带隙的有效调制,最大红移使光吸收波长拓展至494 nm;光吸收带隙与光催化活性并没有直接的对应关系,只有适当的带隙宽度和带隙结构才具有较好的光催化活性。Nanosized co-doped titania with Zn^2＋, Fe^3＋ and Ce^4＋ were prepared by low temperature combustion synthesis（LTCS） using TiCl4 as the precursor. The light absorption performance of as-prepared samples was characterized by means of Uv-vis diffuse reflectance spectra. The study of photocatalytic activity has been carried out using methylene blue as objective contamination under visible light. The effects ofFe/Ce（mol）, （Fe＋Ce）/Ti（mol）, citric acid/Ti（mol）, calcination temperature and time on the light absorption performance of the resulting materials have been investigated in detail. The results showed that light absorption band gap could be modulated effectively by controlling over experimental conditions of LTCS, and that light absorption wavelength was extended to 494 nanometer due to extreme red shill Direct corresponding relationship between photocatalytic activity and light absorption band gap did not exist which suggested that only the materials with suitable band gap width and structure were provided with higher photocatalytic activity.

关 键 词：低温燃烧合成 掺杂二氧化钛 光吸收 光催化活性 

分 类 号：O614.411[理学—无机化学] O644.4[理学—化学]