Abstract
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.
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