Cuboid-like Bi2Fe4O9/Ag with Graphene-Wrapping Tribrid Composite with Superior Capability for Environmental Decontamination: Nanoscaled Material Design and Visible-Light-Driven Multifunctional Catalys

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• 作者：Zhong-Ting Hu ; Shun Kuang Lua ; Teik-Thye Lim
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：November 2, 2015
• 年：2015
• 卷：3
• 期：11
• 页码：2726-2736
• 全文大小：845K
• ISSN：2168-0485

文摘

A cuboid-like Bi₂Fe₄O₉/Ag with graphene-wrapping tribrid nanoarchitecture was fabricated using a delicate multistep synthesis process. It is designed to effectively enhance the performance of the pristine Bi₂Fe₄O₉ in the removal of organic pollutants [up to 97% of methylene blue (MB) removal in 30 min under visible light irradiation] through ternary collaboration among Bi₂Fe₄O₉, silver nanoparticles (AgNPs), and reduced graphene oxide (rGO). The challenges, such as mass transfer of pollutants in water treatment, recombination of electrons/holes, and interconversion between Fe(III) and Fe(II) states within Bi₂Fe₄O₉, could be addressed effectively. The resulting samples (i.e., Bi₂Fe₄O₉/Ag/rGO, Bi₂Fe₄O₉/Ag, and Bi₂Fe₄O₉) were characterized by various techniques, and their differences in physical and chemical properties were investigated. Meanwhile, their applications in the removal of organic pollutants were assessed via photo-Fenton oxidation and photocatalysis under visible light irradiation. The findings demonstrate the individual functions of AgNP [i.e., electrical conduction and enhanced interconversion of Fe(III) and Fe(II)] and rGO (i.e., antirecombination of electrons/holes and enhanced mass transfer of organic pollutants) within the Bi₂Fe₄O₉/Ag/rGO composite. A schematic illustration of the mechanism of the removal of organic pollutants using the multifunctional Bi₂Fe₄O₉/Ag/rGO is presented.