Photocatalytic Activity And Synthesis Technology Of TiO₂-SiO₂-Fe₃O₄Nanoparticles With Core-shell Structure

Presently, the TiO₂nanoparticles have been used as photocatalytic material. However,the key constraint of this progress is that the TiO₂nanoparticles pollute the water whentreating the water. This research is focusing on synthesis the recoverable nanoparticles withhigh photocatalytic activity.The mainly superparamagnetic Fe₃O₄cores are introduced to make the photocatalystTiO₂can be recovered through a magnetic separator technology. However, the interactionbetween Fe₃O₄and TiO₂will influence the catalytic activity of TiO₂. The SiO₂was introducedas intermediate layer because of its well hydrophilicity and high stability. Therefore, theTiO₂-SiO₂-Fe₃O₄functional particles with TiO₂functional layer are synthesized in this paper.The TiO₂/SiO₂/Fe₃O₄functional particles are obtained through carbon reduction methodand sol-gel method，the repeatable of this method has been tested. The best experimentparameter of the Fe₃O₄, SiO₂/Fe₃O₄and TiO₂/SiO₂/Fe₃O₄are confirmed through the results ofTEM, XRD, VSM, BET and UV-Vis spectrum characterization. The photocatalytic activity ofthe TiO₂/SiO₂/Fe₃O₄particles was tested then, and the particles showed significantly highcatalytic activity under both UV-light and visible light irradiation. The recoverable property ofthe TiO₂/SiO₂/Fe₃O₄has also been demonstrated in this research.