title: Bactericidal activity and mechanism of Ti-doped BiOI microspheres under visible light irradiation.
abstract: Ti doped BiOI microspheres were successfully synthesized through a solvothermal method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectra (DRS) spectroscopy, respectively. The as-synthesized microspheres had 3D hierarchical structures, and the morphologies and visible-light-driven (VLD) disinfection performances were found to be determined by the amount of loaded Ti. The incorporation of Ti in the lattice of BiOI broadened the band gap of BiOI and enhanced the VLD disinfection activity. Ti doped BiOI microspheres with the optimal Ti content exhibited excellent antibacterial performances against both representative Gram-negative and Gram-positive strains, which completely inactivated 3.0×10(7)CFUmL(-1)E. coli in 24min and 3.0×10(6)CFU mL(-1)S. aureus in 45min, respectively. Active species including h(+), e(-), O2(-) and H2O2 were found to play important roles in disinfection system. Moreover, the damage of cell membrane and emission of cytoplasm directly led to the inactivation.
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
authors.forename: Jialiang
authors.initials: J
authors.lastname: Liang
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Deng
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
authors.forename: Mian
authors.initials: M
authors.lastname: Li
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
authors.forename: Tongyan
authors.initials: T
authors.lastname: Xu
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China. Electronic address: tongmeiping@iee.pku.edu.cn.
authors.forename: Meiping
authors.initials: M
authors.lastname: Tong
mesh_terms: D001729:Bismuth / Q000008:administration & dosage / Q000737:chemistry*; D002384:Catalysis; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development* / Q000528:radiation effects; D008027:Light; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008863:Microspheres; D056951:Photoelectron Spectroscopy; D013211:Staphylococcus aureus / Q000187:drug effects / Q000254:growth & development* / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D014025:Titanium; D001729:Bismuth
keywords: Active species; Disinfection effects; Inactivation mechanisms; Photocatalytic disinfection; Ti doped BiOI microspheres