期刊
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
卷 19, 期 1, 页码 442-452出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2019.15780
关键词
Bactericidal Activity; Faceted Anatase; Octahedral Anatase Particles (OAP); Decahedral Anatase Particles (DAP); Plasmonic Photocatalysis
类别
资金
- Grand Challenges Explorations Grant from Bill and Melinda Gates Foundation [GCE R8, OPP1060234]
- Bill and Melinda Gates Foundation [OPP1060234] Funding Source: Bill and Melinda Gates Foundation
Octahedral anatase particles (OAP) with eight equivalent {101} facets and decahedral anatase particles (DAP) with two additional {001} facets were modified with nanoparticles of noble metals (silver, copper, gold and platinum) by photodeposition, and applied for inactivation of Escherichia coli K12. XRD, DRS, XPS and STEM analyses confirmed the presence of noble metals nanoparticles (NPs) on the surface of faceted titania samples. Both OAP and DAP samples modified with silver and copper exhibited high bactericidal activities under visible light irradiation. It was also found that DAP under UV irradiation showed surprisingly high bactericidal activity, which could be attributed to efficient generation of reactive oxygen species, due to intrinsic properties of DAP, i.e., charge carriers' separation (migration of electrons and holes to {101} and {001} facets, respectively). However, an unexpected decrease in activity after DAP modification with gold and platinum NPs (mainly deposited on {101} facets) suggested that bacteria cells were directly decomposed on DAP surface. SEM images revealed that silver-modified samples caused severe damages of cell walls and membranes, due to antibacterial properties of silver (in the dark) and photocatalytic effect under visible and UV irradiation.
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