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Characteristics of DC Gas‐Liquid Phase Atmospheric‐Pressure Plasma and Bacteria Inactivation Mechanism
Author(s) -
Shen Jie,
Sun Qiang,
Zhang Zelong,
Cheng Cheng,
Lan Yan,
Zhang Hao,
Xu Zimu,
Zhao Ying,
Xia Weidong,
Chu Paul K.
Publication year - 2015
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201400129
Subject(s) - plasma , hydrogen peroxide , chemistry , atmospheric pressure , radical , analytical chemistry (journal) , hydrogen , atmospheric pressure plasma , argon , oxygen , plasma cleaning , direct current , environmental chemistry , organic chemistry , physics , quantum mechanics , oceanography , voltage , geology
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 H 2 O 2 and acidic pH. These effects have potential applications in plasma biomedicine and water purification.