Synthesis of Magnetically Separable Ag3PO4/TiO2/Fe3O4 Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinact

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• 作者：Jing-Wen Xu ; Zhi-Da Gao ; Kun Han ; Yongmin Liu ; Yan-Yan Song
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：September 10, 2014
• 年：2014
• 卷：6
• 期：17
• 页码：15122-15131
• 全文大小：680K
• ISSN：1944-8252

文摘

Silver orthophosphate (Ag₃PO₄) is a low-band-gap photocatalyst that has received considerable research interest in recent years. In this work, the magnetic Ag₃PO₄/TiO₂/Fe₃O₄ heterostructured nanocomposite was synthesized. The nanocomposite was found to exhibit markedly enhanced photocatalytic activity, cycling stability, and long-term durability in the photodegradation of acid orange 7 (AO7) under visible light. Moreover, the antibacterial film prepared from Ag₃PO₄/TiO₂/Fe₃O₄ nanocomposite presented excellent bactericidal activity and recyclability toward Escherichia coli (E. coli) cells under visible-light irradiation. In addition to the intrinsic cytotoxicity of silver ions, the elevated bactericidal efficiency of Ag₃PO₄/TiO₂/Fe₃O₄ can be largely attributed to its highly enhanced photocatalytic activity. The photogenerated hydroxyl radicals and superoxide ions on the formed Ag/Ag₃PO₄/TiO₂ interfaces cause considerable morphological changes in the microorganism鈥檚 cells and lead to the death of the bacteria.

Keywords:

photocatalyst; heterostructure; visible light; photoinactivation; bactericidal activity; recyclability