微波辅助水热法制备TiO2/ZnO微球及其对抗生素的降解

Microwave Hydrothermal Preparation of TiO2/ZnO Microspheres and Photocatalytic Degradation of Antibiotics

采用微波辅助水热法制备TiO2/ZnO微球光催化剂。利用红外光谱、X射线衍射、扫描电镜、紫外-可见漫反射光谱等技术对该光催化剂进行表征。以亚甲基蓝及抗生素为目标降解物,200W高压汞灯为光源,考察TiO2与ZnO摩尔比、水热时间、水热温度及煅烧温度对催化剂光降解活性的影响。结果表明,当TiO2∶ZnO摩尔比为1∶1,水热反应温度140℃,水热时间30min,500℃煅烧条件下制备的TiO2/ZnO光催化剂具有较好降解活性,光照50min,对亚甲基蓝降解率达96.15%,对环丙沙星、诺氟沙星和氧氟沙星降解率分别为87.80%、94.51%和93.39%。

TiO2/ZnO photocatalysts were prepared by microwave-assisted hydrothermal method with titanium sulfate and zinc acetate as raw materials.The as-prepared samples were characterized by Fourier infrared spectrum,X-ray powder diffraction,scanning electron microscope,UV-Vis diffuse reflection.The effect of the molar ratio of TiO2 and ZnO,hydrothermal time,reaction temperature,calcining time and calcination temperature on the catalyst photodegradation efficiency were discussed by the degradation of methylene blue and antibiotics under 200 W high pressure mercury lamp.The results showed that the TiO2 doped ZnO photocatalyst with circular microsphere structure,and the molar ratio of TiO2 and ZnO can effectively reduce the ZnO electron-hole recombination rate.The optimum synthesis condition is hydrothermal temperature 140℃,time reaction 30 min,calcination time 4 hand calcination temperature 500℃.The TiO2/ZnO microspheres had good degradation activity.Under irradiation 50 min the degradation of methylene blue,ciprofloxacin,norfloxacin and ofloxacin reached to 96.15%,87.80%,94.51%and 93.39%,respectively.