期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 204, 期 -, 页码 1-10出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2016.11.006
关键词
Ag@Agl/Bi-BiOI; Synergism; Photocatalysis; Disinfection; Mechanism
资金
- NSFC [21373051, U1305242]
- Project of Education Office of Fujian province [JK15002]
- Science and Technology project of the Education Office of Fujian Province of P.R. China [JA12017]
- National Basic Research Program of China (973 Program) [2012CB722607]
Ag@AgI/Bi-BiOI (AABB) three-dimentional (3D) nanoarchitectures, synthesized by solvothermal reaction and photoreduction method, were used as high-effective visible light driven (VLD) photocatalysts for the inactivation of Escherichia coli K-12 (E. cob K-12) and were characterized by TEM, SEM, XRD, BET, XPS and DRS. The prepared 30%AABB exhibited the best bacteria disinfection efficiency, and the quantity of viable bacteria could almost inactivate after being illuminated for 18 min. The enhanced photocatalytic performance can be attributed to the improved separation efficiency of the photogenerated electron-hole pairs because of its multivariant nanoarchitectures with simultaneous electron transfers (Bi -> BiOICBM -> Ag -> AgIVBM). Furthermore, the SEM technology was applied to certify the photocatalytically lethal effect to E. coli K-12 and the rupture of bacterial membranes. In this work, the antibacterial mechanism was studied by employing Photoluminescence (PL), Photoelectrochemical Techniques, Electron Spin Resonance (ESR), and scavengers of different reactive species, revealing the pivotal roles of h(+), e(-), and center dot O-2(-) in the photocatalytic process. This study indicated that the fabricated AABB photocatalysts could be potentially utilized to disinfect bacteria in water. (C) 2016 Elsevier B.V. All rights reserved.
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