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Photocatalytic activity of magnetically anatase TiO2 with high crystallinity and stability for dyes degradation: Insights into the dual roles of SiO2 interlayer between TiO2 and CoFe2O4

机译:高结晶度和稳定性的磁性锐钛矿型TiO2对染料降解的光催化活性:洞察TiO2和CoFe2O4之间SiO2中间层的双重作用

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摘要

A novel magnetically separable photocatalyst comprising hollow TiO2-SiO2-CoFe2O4 (TSC) was prepared. In the TSC photocatalyst, an SiO2 interlayer between CoFe2O4 core and TiO2 shell is used to both weaken adverse influence of the magnetic core on photocatalysis and increase the temperature of the transition from anatase to rutile phase TiO2, thus increasing the anatase TiO2 crystallinity. Such an interlayer promotes photocatalytic activity by changing the competition between the injecting process and reacting process of the photogenerated carriers. The photocatalytic activity of TSC was determined for degradation of dye molecules in water under either UV or visible light. The photocatalytic reaction of cationic dyes was governed by (OH)-O-center dot radicals, while O-2(center dot-) was the main active species in the initial photoreaction of anionic dyes. (C) 2016 Elsevier B.V. All rights reserved.
机译:制备了一种新型的可分离空心TiO2-SiO2-CoFe2O4(TSC)的光催化剂。在TSC光催化剂中,CoFe2O4核与TiO2壳之间的SiO2中间层既可以减弱磁核对光催化的不利影响,又可以提高从锐钛矿相转变为金红石相TiO2的温度,从而提高了锐钛矿TiO2的结晶度。这样的中间层通过改变光生载流子的注入过程和反应过程之间的竞争来促进光催化活性。确定了TSC在紫外或可见光下对染料分子在水中的降解的光催化活性。阳离子染料的光催化反应受(OH)-O-中心点自由基的支配,而O-2(中心点-)是阴离子染料初始光反应的主要活性物质。 (C)2016 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Applied Surface Science》 |2017年第31期|192-199|共8页
  • 作者单位

    Nanjing Univ, Sch Environm, Nanjing 210046, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, Nanjing 210046, Jiangsu, Peoples R China|Huaiyin Inst Technol, Key Lab Palygorskite Sci & Appl Technol, Sch Chem Engn, Huaian, Peoples R China;

    Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, ERERC, Nanjing 210093, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SiO2; Photocatalysis; Magnetic separation; Dye; Active species;

    机译:SiO2;光催化;磁分离;染料;活性物质;

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