【摘要】 采用三步方法合成了可回收的Fe₃O₄/SiO₂/Bi₂WO₆磁性复合光催化剂,通过溶剂热法合成具有磁性的Fe₃O₄,用溶胶凝胶法在Fe₃O₄表面覆盖SiO₂层后将磁性颗粒与Bi₂WO₆纳米片相结合。光催化剂的形貌结构及性能通过XRD、SEM、PL、UV-vis进行表征测试。结果表明,直径约500 nm的Fe₃O₄微球附着在边长约500 nm的Bi₂WO₆纳米片的表面,SiO₂在两者之间起到了粘连作用。光催化剂Fe₃O₄/SiO₂/Bi₂WO₆对于罗丹明B的光降解活性较好,且有一定磁性,可以通过外加磁场将其从溶液中分离,有较大的应用潜力。更多还原

【Abstract】 The magnetically recoverable photocatalyst Fe₃O₄/SiO2/Bi₂WO₆ was synthesized by a three-step approach. After a hydrothermal process of preparing ferroferric oxide（Fe₃O₄）, these Fe₃O₄ nanoparticles were coated with SiO₂ by a sol-gel method. Finally, Fe₃O₄/SiO₂ nanoparticles were immobilized onto the surface of Bi₂WO₆ by a second hydrothermal process. The morphology, structure and properties of the composite were characterized by XRD, SEM, PL spectra and UV-vis absorption spectrum. The results show that the Bi₂WO₆ nanosheet structures with an average diameter of 500 nm are further decorated by Fe₃O₄ nanoparticles with an average diameter of 500 nm.The photocatalytic activity of Fe₃O₄/SiO2/Bi₂WO₆ to degrade rhodamine B is close to that of pure Bi₂WO₆. The photocatalyst with appropriate superparamagnetism can be easily re-collected by applying an external magnetic field. It shows potential applications in pollutant degradation.更多还原