title: Synthesis of magnetically separable Ag3PO4/TiO2/Fe3O4 heterostructure with enhanced photocatalytic performance under visible light for photoinactivation of bacteria.
abstract: 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's cells and lead to the death of the bacteria.
authors.affiliation: College of Sciences, Northeastern University , Shenyang 110004, China.
authors.forename: Jing-Wen
authors.initials: JW
authors.lastname: Xu
authors.forename: Zhi-Da
authors.initials: ZD
authors.lastname: Gao
authors.forename: Kun
authors.initials: K
authors.lastname: Han
authors.forename: Yongmin
authors.initials: Y
authors.lastname: Liu
authors.forename: Yan-Yan
authors.initials: YY
authors.lastname: Song
mesh_terms: D002384:Catalysis; D004926:Escherichia coli / Q000187:drug effects / Q000528:radiation effects*; D005290:Ferric Compounds / Q000138:chemical synthesis* / Q000494:pharmacology; D007700:Kinetics; D008027:Light; D060328:Magnetic Phenomena; D050296:Microbial Viability / Q000187:drug effects / Q000528:radiation effects*; D008962:Models, Theoretical; D053758:Nanoparticles / Q000648:ultrastructure; D054118:Nanospheres / Q000648:ultrastructure; D010710:Phosphates / Q000138:chemical synthesis* / Q000494:pharmacology; D018030:Silver Compounds / Q000138:chemical synthesis* / Q000494:pharmacology; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry* / Q000494:pharmacology; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D010710:Phosphates; D018030:Silver Compounds; C009495:titanium dioxide; C000499:ferric oxide; D014025:Titanium; C039072:silver phosphate
keywords: bactericidal activity; heterostructure; photocatalyst; photoinactivation; recyclability; visible light