铁离子掺杂磁载TiO_2光催化剂的制备及光催化性能(英文)

PREPARATION AND PHOTOCATALYTIC PROPERTIES OF Fe(Ⅲ)-DOPED TiO_2 MAGNETICALLY SEPARABLE PHOTOCATALYST

采用溶胶-凝胶法,制备了一种具有锐钛矿结构的新型磁载Fe(Ⅲ)掺杂纳米TiO2/SiO2/Fe3O4(FTSF)光催化剂。制备的FTSF粉体样品的颗粒尺寸为10～20nm,颗粒为复合包覆型结构。通过降解1×10-4mol/L甲基橙溶液表征了FTSF样品的光催化效率。结果表明:Fe(Ⅲ)的加入明显地增强了样品的光催化活性和可见光吸收能力,当Fe(Ⅲ)的含量为0.9%(摩尔分数),并在400℃煅烧3h的FTSF粉体样品具有最佳光催化活性,对甲基橙溶液有较高的降解能力,在紫外光辐照90min,甲基橙的降解率超过95%。利用样品的磁性特点可将其从被降解溶液中回收,回收率可达98%(质量分数),循环使用时光催化效率仍保持在80%,具有较好的应用前景。

Fe（Ⅲ）-doped TiO2/SiO2/Fe3O4 （FTSF） photocatalyst with anatase structure and a particle size range of 10--20nm was synthesized by the sol-gel process, and its photocatalytic efficiency was characterized through degradation of 1 × 10^-4 mol/L methyl orange solution. The results show that the adsorption capability in the visible region and photocatalytic activity of FTSF samples with suitable Fe （Ⅲ） dopant content can be improved. The FTSF powder sample calcined at 400℃ for 3 h and doped with 0.9% （in mole, the same below） Fe （Ⅲ） has the highest photocatalytic efficiency, and its degradation ratio is over 95% for methyl orange solution after ultraviolet light irradiation treatment for 90 min. In addition, more than 98% （in mass） FTSF powder particles can be separated from the solution after degradation treatment using magnetic iron and its photocatalytic efficiency can be maintained at 80%. It is considered that the FTSF powder doped with 0.9% Fe （Ⅲ） is a promising photocatalyst.