微波辅助水热法制备TiO_2/ZnO微球及其对抗生素的降解
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摘要
采用微波辅助水热法制备TiO_2/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TiO_2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TiO_2∶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TiO_2/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%。
TiO_2/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 TiO_2 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 TiO_2 doped ZnO photocatalyst with circular microsphere structure,and the molar ratio of TiO_2 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 TiO_2/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.
TiO_2/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 TiO_2 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 TiO_2 doped ZnO photocatalyst with circular microsphere structure,and the molar ratio of TiO_2 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 TiO_2/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.
引文
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