A magnetic TiO2 photocatalyst doped with iodine for organic pollutant degradation

作者：He Zhiqiao; Hong Tianmi; Chen Jianmeng; Song Shuang^*

来源：Separation and Purification Technology, 2012, 96: 50-57.

DOI：10.1016/j.seppur.2012.05.005

• Iodine-doped TiO2
• Magnetic separation
• Phenol
• SiO2-coated Fe3O4
• Visible light irradiation

A series of iodine-doped titanium dioxide (I-TiO2) photocatalysts was synthesized by using silica-coated Fe3O4 (SF) as the magnetic core (abbreviated here as ITSF), in order to facilitate the efficient recovery of these photocatalysts. Transmission electron microscopy and X-ray diffraction results indicated that the ITSF nanoparticles had a ternary structure with a core of Fe3O4, a SiO2 mesosphere and an I-TiO2 crust with a mixture of anatase and rutile phases. Magnetic measurements with a vibrating sample magnetometer showed that the ITSF core-shell structures exhibited favorable superparamagnetic behaviors and the magnetic saturation value decreased after coating with the non-magnetic I-TiO2 layer. The photocatalytic activity of the particles was tested by degrading an aqueous phenol solution under visible-light illumination. The photocatalytic activity of the multi-functional hybrid magnetite nanoparticles was enhanced with increasing content of TiO2, while the magnetism of the composite particles decreased. Moreover, an optimum molar ratio of 1:10 I/TiO2 was determined for the efficient degradation of phenol. The study showed that the presence of SF magnetic core would be helpful in the separation and recovery of I-TiO2 photocatalysts.

• 出版日期2012-8-21
• 单位浙江工业大学