期刊
PLASMA PROCESSES AND POLYMERS
卷 12, 期 3, 页码 252-259出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppap.201400129
关键词
bacteria inactivation; gas-liquid phase atmospheric pressure plasma; plasma process in liquid; reactive species
资金
- National Natural Science Foundation of China [11005126, 11205203, 11035005]
- Hefei Institutes of Physical Science, Chinese Academy of Sciences (CASHIPS) [YZJJ201331]
- City University of Hong Kong Applied Research Grant (ARG) [9667085]
- Hong Kong Research Grants Council (RGC) General Research Funds (GRF) [CityU 112212]
A direct current (DC) gas-liquid phase atmospheric-pressure argon (Ar) plasma is used to inactivate Staphylococcus aureus suspended in the liquid. The characteristics of the gas-liquid plasma such as gas temperature, electron excitation temperature, and electron density are investigated by optical emission spectroscopy (OES). Direct plasma treatment for 40 min results in more than 2.0-log cell reduction. The emission spectra obtained from the gas-liquid phase plasma show the presence of hydroxyl radicals and atomic oxygen which give rise to effective inactivation of microorganisms. The energetic particles generated from the plasma tend to induce chemical effects such as formation of hydroxyl and hydrogen peroxide and reduced pH. The water sample after plasma treatment retains the inactivation ability for a long time and the germicidal effects arise from residual H2O2 and acidic pH. These effects have potential applications in plasma biomedicine and water purification.
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