期刊
PLASMA SCIENCE & TECHNOLOGY
卷 25, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2058-6272/ac7db9
关键词
plasma photocatalysis; sterilization; corona discharge; Au; TiO2 nanocatalyst; synergetic effect
The study reports a plasma photocatalytic system (PPS) constructed from a needle array corona discharge and Au/TiO2 plasmonic nanocatalyst, which improves the sterilization of Escherichia coli (E. coli) and reduces the formation of ozone (O-3) as a secondary pollutant. The presence of Au/TiO2 in the PPS enhances the interaction between plasma, E. coli, and nanocatalysts, leading to efficient sterilization and suppression of O-3 formation. The Au/TiO2 can be excited by ultraviolet-visible light emitted from the plasma to generate reactive radicals and oxidatively inactivate E. coli. This plasma photocatalytic system shows promise in developing high-efficiency sterilization techniques.
Efficient sterilization by a plasma photocatalytic system (PPS) requires strong synergy between plasma and photocatalyst to inactivate microorganisms while suppressing the formation of secondary pollutants. Here, we report that a PPS constructed from a needle array corona discharge and Au/TiO2 plasmonic nanocatalyst could remarkably improve the sterilization of Escherichia coli (E. coli) and alleviate formation of the discharge pollutant O-3. At 6 kV, the combination of corona discharge and Au/TiO2 achieves sterilization efficiency of 100% within an exposure time of 5 min. At 5 kV and an exposure time of 8 min, the presence of Au/TiO2 improves sterilization efficiency of the corona discharge from 73% to 91% and reduces the O-3 concentration from 0.38 to 0.04 ppm, whereas the presence of TiO2 reduces the sterilization efficiency and O-3 concentration to 66% and 0.17 ppm, respectively. The Au/TiO2 in the PPS enables a uniform corona discharge, enhances the interaction between plasma, E. coli and nanocatalysts, and suppresses the formation of O-3. Further, the Au/TiO2 can be excited by ultraviolet-visible light emitted from the plasma to generate electron-hole pairs, and thus contributes to the formation of reactive radicals and the oxidative inactivation of E. coli. The PPS constructed from a needle array corona discharge and Au-based plasmonic nanocatalyst provides a promising approach for developing high-efficiency sterilization techniques.
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