ZnFe2O4/Ag/TiO2复合材料的制备及其光催化性能

以硝酸银、钛酸四丁酯、无水氯化锌、六水氯化铁为原料，采用溶胶-凝胶法与溶剂热相结合的方法制备了ZnFe₂O₄/Ag/TiO₂复合材料，通过扫描电子显微镜、能谱分析仪、X射线粉末衍射仪、X射线光电子能谱仪、振动样品磁强计、紫外可见分光光度计对样品进行表征及测试。结果表明： ZnFe₂O₄/Ag/TiO₂-10具有最佳的光催化效果，在紫外和可见光下对染料的降解率都能达到90%以上，具有优异的紫外可见光光催化活性。ZnFe₂O₄/Ag/TiO₂具有独特的磁性，能在外部磁场作用下进行回收利用，这使其在实际应用中成为可能。通过磁分离技术重复回收利用5次后仍然保持优良的光催化性能，说明ZnFe₂O₄/Ag/TiO₂-10具有优异的磁性及较高的光催化循环稳定性。

Preparation and photocatalytic properties of ZnFe2O4/Ag/TiO2 composite

ZnFe₂O₄/Ag/TiO₂ composites were prepared with silver nitrate, tetrabutyl titanate, anhydrous zinc chloride, and ferric chloride hexahydrate as raw materials by sol-gel and solvothermal methods. The samples were characterized and tested by scanning electron microscope, energy spectrum analyzer, X-ray powder diffractometer, X-ray photoelectron spectrometer, vibrating sample magnetometer, ultraviolet visible spectrophotometer. The results showed that ZnFe₂O₄/Ag/TiO₂-10 had the best photocatalytic effect, and the degradation rate of dye can reach more than 90% under both ultraviolet and visible light. It had excellent ultraviolet/visible light photocatalytic activity. And after being compounded with ZnFe₂O₄, ZnFe₂O₄/Ag/TiO₂ had unique magnetism, which can be recycled under the action of external magnetic field, which makes it possible in practical application. Through magnetic separation technology, the photocatalysis performance of ZnFe₂O₄/Ag/TiO₂-10 was still excellent after recycling for five times, which showed excellent magnetism and high photocatalytic cycle stability.