纳米复合材料TiO_2/ZnFe_2O_4的制备及光催化性能

Preparation and photocatalytic property of nanoscale TiO_2/ZnFe_2O_4 composites

用高分子网络凝胶法制备TiO_2/ZnFe_2O_4纳米复合材料,研究了掺杂ZnFe_2O_4对TiO_2平均粒径、晶型及其光催化性能的影响.结果表明,掺杂的ZnFe_2O_4纳米晶高度分散、均匀地分布在TiO_2表面,促进了TiO_2向稳定的金红石相转变,并抑制了晶粒的长大.ZnFe_2O_4掺杂量为2%的TiO_2/ZnFe_2O_4粉体在500℃煅烧后,在可见光范围内具有最佳的次甲基蓝降解效果,降解率达到100%.ZnFe_2O_4的掺杂扩展了TiO_2的光谱响应范围.

Nanoscale composites TiO2/ZnFe2O4 were prepared by the polyacrylamide gel method. The effects of ZnFe2O4 concentration and sintered temperature on the properties and photocatalytic activities of TiO2 were studied by XRD, TEM and UV-Vis. The results showed that the surface of TiO2 was covered equally with dispersing highly nanocrystal ZnFe2O4, which accelerated the anatase-to-rutile phase transformation of TiO2 and inhibited the growth of TiO2 particles. The photocatalytic experimental results demonstrated that methylene blue could be photodegraded completely by TiO2/ZnFe2O4 with 2%（wt） ZnFe204 dope concentration under visible light irradiation after sintered at 500℃. The dope of ZnFe2O4 has expanded spectrum response range of TiO2.