• 文献标题:   Reduced graphene oxide wrapped Fe3O4@TiO2 yolk-shell nanostructures as a magnetic recyclable photocatalytic antibacterial agent
  • 文献类型:   Article
  • 作  者:   ZHANG ZY, FANG YR, ZHUO L, YUAN H, ZHANG LS
  • 作者关键词:   titanium oxide, ferroferric oxide, photocatalytic antibacterial, reduced graphene oxide, magnetic adsorption separation, medical wastewater treatment
  • 出版物名称:   JOURNAL OF ALLOYS COMPOUNDS
  • ISSN:   0925-8388 EI 1873-4669
  • 通讯作者地址:  
  • 被引频次:   9
  • DOI:   10.1016/j.jallcom.2022.164001 EA FEB 2022
  • 出版年:   2022

▎ 摘  要

In this study, we report reduced graphene oxide wrapped Fe3O4@TiO2 yolk-shell nanostructures (G-Fe3O4@TiO2) as a magnetic recyclable photocatalytic antibacterial agent for medical wastewater treatment. The yolk-shell structure with a magnetic oxide core was synthesized using a template-assisted route and graphene wrapping was added using the one-step method. The obtained samples were characterized by TEM, XRD, XPS, FTIR, Raman and BET analysis. Owing to the photocatalysis property, TiO2 exhibits certain antibacterial effect by generating reactive oxygen species (ROS). As an excellent conductor, Fe3O4 improves the photocatalytic performance of TiO2 after forming a yolk-shell structure. Moreover, the synergistic effect of Fe3O4 magnetism and graphene adsorption ensure bacteria removal under external magnetic field. Graphene inhibits the recombination of photogenerated electron-hole pairs, maximizing the bactericidal activity of the material. With the dual functions of photocatalytic bactericidal and magnetic targeting to separate bacteria, the removal percentage of Staphylococcus aureus (S. aureus) cocultured with G-Fe3O4@TiO2 reached up to 99.9% in 4 h exposure to visible light and external magnetic field, higher than 61% in Escherichia coli (E. coli). Therefore, G-Fe3O4@TiO2 could effectively remove typical bacteria on the premise of biosafety, which provided an ideal recyclable material for medical wastewater treatment. (c) 2022 Elsevier B.V. All rights reserved.