Inexpensive synthesis of a high-performance Fe3O4-SiO2-TiO2 photocatalyst： Magnetic recovery and reuse  

作　　者：Nadir Abbas Godlisten N. Shao Syed M. Imran Muhammad S. Haider Hee Taik Kim 

机构地区：[1]Department of Chemical Engineering, Hanyang University, Ansan-si, Gyeonggi-do 426-791, Republic of Korea [2]Department of Civil and Environmental Engineering, Hanyang University, Ansan-si, Gyeonggi-do 426-791, Republic of Korea [3]Department of Chemical Engineering, University of Gujrat, HH Campus, Punjab, Pakistan

出　　处：《Frontiers of Chemical Science and Engineering》2016年第3期405-416,共12页化学科学与工程前沿（英文版）

摘　　要：A sol-gel technique has been developed for the synthesis of a magnetite-silica-titania （Fe3O4-SiO2-TiO2） tertiary nanocomposite with improved photocatalytic properties based on the use of inexpensive titania and silica precursors. The exceptional photocatalytic activity of the resulting materials was demonstrated by using them to photocatalyze the degradation of methylene blue solution. The best formulation achieved 98% methylene blue degradation. An interesting feature of the present work was the ability to magnetically separate and reuse the catalyst. The efficiency of the catalyst remained high during two reuses. The synthesized nanomaterials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron micro- scopy （TEM）, Fourier transform infrared （FTIR） spectro- scopy, ultra-violet-visible spectroscopy, diffuse reflectance spectroscopy, and thermogravimetric analysis. XRD ana- lysis revealed the formation of multicrystalline systems of cubic magnetite and anatase titania crystals. SEM and TEM characterization revealed well-developed and homo- geneously dispersed particles of size less than 15 nm. FTIR spectra confirmed the chemical interaction of titania and silica. It was further noticed that the optical properties of the prepared materials were dependent on the relative contents of their constituent metal oxides.A sol-gel technique has been developed for the synthesis of a magnetite-silica-titania （Fe3O4-SiO2-TiO2） tertiary nanocomposite with improved photocatalytic properties based on the use of inexpensive titania and silica precursors. The exceptional photocatalytic activity of the resulting materials was demonstrated by using them to photocatalyze the degradation of methylene blue solution. The best formulation achieved 98% methylene blue degradation. An interesting feature of the present work was the ability to magnetically separate and reuse the catalyst. The efficiency of the catalyst remained high during two reuses. The synthesized nanomaterials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron micro- scopy （TEM）, Fourier transform infrared （FTIR） spectro- scopy, ultra-violet-visible spectroscopy, diffuse reflectance spectroscopy, and thermogravimetric analysis. XRD ana- lysis revealed the formation of multicrystalline systems of cubic magnetite and anatase titania crystals. SEM and TEM characterization revealed well-developed and homo- geneously dispersed particles of size less than 15 nm. FTIR spectra confirmed the chemical interaction of titania and silica. It was further noticed that the optical properties of the prepared materials were dependent on the relative contents of their constituent metal oxides.

关 键 词：sol-gel photocatalysis magnetic recovery TiO2 FE3O4 SiO2 

分 类 号：O611.4[理学—无机化学] O643.36[理学—化学]