Photocatalytic Bi₂WO₆ and magnetic Fe₃O₄ nanoparticles were synthesized with hydrothermal process, and then were bonded together with polyethylene glycol and oxidized to form Fe₃O₄/Bi₂WO₆ and γ-Fe₂O₃/Bi₂WO₆ nanocomposites. The microstructure, component, magnetic response and photocatalytic degradation to ciprofloxacin (CIP) were studied with x-ray diffraction, N₂ adsorption-desorption isotherms, energy dispersive spectrometer, vibrating sample magnetometer and UV/Vis spectrophotometer. Bi₂WO₆ nanoparticles presented the highest CIP removal of about 98% in 120 min under visible light irradiation, which was higher than that of Fe₃O₄/Bi₂WO₆ (90%) and γ-Fe₂O₃/Bi₂WO₆ (65%) nanocomposites. Both Bi₂WO₆-based nanocomposites could be easily separated by external magnetic field in 1 min. Fe₃O₄/Bi₂WO₆ nanocomposites showed the better synergistic effect of magnetic response and photocatalytic performance under visible light irradiation. Moreover, the photocatalytic mechanism for magnetic nanocomposites was deduced based on the energy band theory of semiconductor heterojunction contact.

光催化的Bi ₂ WO ₆和磁性的Fe _3个ö ₄纳米颗粒与水热法合成，然后用聚乙二醇结合在一起，并氧化形成的Fe ₃ ö ₄ /铋₂ WO ₆和γ-的Fe ₂ ö ₃ /铋₂ WO _6种纳米复合材料。用X射线衍射，N ₂吸附-解吸等温线，能量色散光谱仪，振动样品磁力仪和UV / Vis分光光度计研究了环丙沙星（CIP）的微观结构，组分，磁响应和光催化降解。碧₂WO _6个纳米粒子呈现最高CIP去除约98％在可见光照射下120分钟，这是比Fe更高₃ ö ₄ /铋₂ WO ₆（90％）和γ-的Fe ₂ ö ₃ /铋₂ WO ₆（65％）纳米复合材料。两种Bi ₂ WO ₆基纳米复合材料都可以在1分钟内轻松地被外部磁场分离。Fe ₃ O ₄ / Bi ₂ WO ₆纳米复合材料在可见光照射下表现出较好的磁响应和光催化性能的协同效应。此外，基于半导体异质结接触的能带理论推导了磁性纳米复合材料的光催化机理。