The hollow Fe₃O₄/mesoporous SiO₂/TiO₂ (FST) composite microspheres were prepared with the multistep coating technique through sol-gel and hydrothermal process. The composite microspheres have a unique a network hollow structure intersected with Fe₃O₄ nanorods, mesoporous SiO₂ interlayer and TiO₂ nanoparticles. The magnetization saturation and coercivity values of the FST microspheres are 9.4 emu/g and 45.98 Oe so that the composite microspheres could be effectively separated from the suspension by an external magnetic field and redispersed for further reuse. The as-synthesized FST microspheres show a high surface area (338 m²/g) and a large pore volume (0.44 cm³/g). The FST microspheres exhibit high photocatalytic activity under the UV light, and the degradation rate of methyl orange could reach up to 95.0%. It is important that the hollow structure and anatase TiO₂ nanoparticles in mesoporous channels are both attributed to the enhanced photocatalytic performance of the FST photocatalyst.

采用溶胶-凝胶法和水热法，采用多步涂覆技术​​制备了空心Fe ₃ O ₄ /介孔SiO ₂ / TiO ₂（FST）复合微球。复合微球具有独特的网络空心结构，该结构与Fe ₃ O ₄纳米棒，介孔SiO ₂中间层和TiO ₂纳米颗粒相交。FST微球的磁化饱和度和矫顽力值为9.4 emu / g和45.98 Oe，因此复合微球可通过外部磁场有效地从悬浮液中分离出来并重新分散以进一步使用。合成后的FST微球显示出高表面积（338 m² / g）和大孔体积（0.44 cm ³ / g）。FST微球在紫外光下表现出较高的光催化活性，甲基橙的降解率可达95.0％。重要的是中孔通道中的中空结构和锐钛矿型TiO ₂纳米颗粒都应归因于FST光催化剂的增强的光催化性能。