Study on the Antibacterial Property of Ag-deposited N-/S-doped TiO2 P25 Nanoparticles against Escherichia coli
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Abstract:
To broaden the spectral response of nanoscale TiO2 and to enhance its visible-light photocatalytic antibacterial activity, in this study, chemical deposition of silver (Ag) and the doping of nonmetal elements nitrogen (N) and sulfur (S) was performed to prepare modified P25 antibacterial materials (Ag-P25, Ag-N-P25, and Ag-S-P25) with commercial TiO2 nanoparticles as the raw material. The antibacterial effects of these three P25 materials were studied against Escherichia coli under visible light. The study showed that all the three antibacterial materials had good inhibitory effects on E. coli growth. The antibacterial rate of the modified P25 materials increased with the extension of illumination time under visible light. The antibacterial effects of the three materials were in the following order: Ag-S-P25 > Ag-N-P25 > Ag-P25. When the materials were illuminated for 100 min, the antibacterial rate of Ag-S-P25, Ag-N-P25, and Ag-P25 reached 100%, which was 21% higher than that of pure P25 material. The results from scanning electron microscopy (SEM) and electrophoresis of the bacterial plasmid DNA showed that the E. coli cells were damaged by these three materials, which also caused the leakage of plasmid DNA and led to the death of bacteria. Further study and discussion on the E. coli inactivation mechanism of modified P25 materials can provide a theoretical and experimental foundation for the development of new antibacterial materials for food preservation.
