Fe3O4@SiO2@TiO2-Co/rGO磁性光催化剂的合成及其光催化活性研究

采用溶胶-凝胶法和水热法（HTM）合成了Fe₃O₄@SiO₂@TiO₂-Co/rGO复合纳米粒子（磁性光催化剂），通过X射线衍射、扫描电子显微镜及其能量分散光谱和UV-vis漫反射光谱对产物进行了表征分析.研究了Co掺杂量、溶液pH值、亚甲基蓝（MB）溶液初始浓度以及干扰离子（例如Cl^-、SO₄^2-、CO₃^2-）等因素对MB降解的影响，并对磁性光催化剂的可重复使用性进行了分析.正常实验条件下（pH=7，MB]=10 mg/L，磁性光催化剂用量=0.1 g/50 mL），150 min内MB最大去除率达到98.24%.干扰离子影响MB降解次序为CO₃^2- < Cl^- < SO₄^2-，磁性光催化剂重复使用7次MB光降解率仅下降7.07%，新型磁性光催化剂具有良好的MB降解性能和较高的重复使用性能.

Synthesis and Photocatalytic Activity of Fe3 O4@SiO2@TiO2-Co/rGO Magnetic Photocatalyst

The Fe₃O₄@SiO₂@TiO₂-Co/rGO nanoparticles(magnetic photocatalyst) synthesized by sol-gel method and hydrothermal method (HTM). The synthesized catalysts were characterized by X-ray Diffraction, UV-vis Diffuse reflectance spectroscopy, Scanning electron microscopy and Energy Dispersive Spectrometer. The effects of Co doping amount, pH of solution, initial concentration of methylene blue (MB) solution and interference ions (e.g., Cl^-, SO₄^2-, CO₃^2-) on MB degradation were studied, and the reusability of the magnetic photocatalyst was analyzed. In normal experimental conditions (pH=7, MB=10 mg/L, photocatalyst dosage=0.1 g/50 mL), maximum MB solution removal was obtained 98.24% in 150 min reaction time. Interfering ions reduced MB solution degradation in order of CO₃^2- < Cl^- < SO₄^2-, and the photodegradation rate of MB decreased by only 7.07% after the magne-tic photocatalyst was reused for 7 times. It could be concluded that the synthesized photocatalyst has good perfor-mance and high reusability.