煅烧温度、煅烧时间和Fe^(3+)掺杂量对TiO_2光催化性能的影响

The Effect of Calcination Temperature,Calcination Time and Fe^(3+)-doped Amount on the Photocatalytic Activity of TiO_2

以钛酸四正丁酯为先驱物,采用溶胶-凝胶法制备了纯TiO2和Fe3+掺杂的纳米TiO2(Fe3+/TiO2)光催化剂,并用XRD、UV-Vis等进行了表征,系统研究了煅烧温度、煅烧时间和Fe3+掺杂量对催化剂在自然光条件下光催化降解甲基橙性能的影响。结果表明,相同煅烧温度下,Fe3+/TiO2的粒径比纯TiO2的粒径小。制备纯TiO2和Fe3+/TiO2的最佳煅烧时间分别为4h和3h,最佳煅烧温度均为773K。适量掺入Fe3+可以显著提高纳米TiO2在自然光条件下的光催化降解活性,Fe3+/TiO2中Fe3+的最佳掺杂量为10.00%,相应的脱色效率为28.37%。

Pure and Fe^3＋-doped TiO2 nanoparticle photocatalysts are prepared by the sol-gel method using Ti- （OC4 H9 ）4 as precursor, and it is characterized by X-ray diffraction（XRD） and UV-Vis. The effect of calcination temperature, calcination time and Fe^3＋-doped amount on the photocatalytic activity of TiO2 are investigated by photocatalytic degradation of methyl orange irradiated by sunlight. The optimal calcination time for pure TiO2 and Fe^3＋ -doped TiO2 is 4h and 3h, respectively. The optimal calcination temperature is 773K for both pure TiO2 and Fe^3＋-doped TiO2. The amount of Fe^3＋-doped can remarkably increase the catalytic activity of TiO2 under nature light irradiation, the optimal amount of Fe^3＋ in Fe^3＋ -doped TiO2 is 10.00%, and the corresponding decolorization efficiency is 28. 37 %.