Optical and application study of gas-liquid discharge excited by bipolar nanosecond pulse in atmospheric air.
In this study, a bipolar nanosecond pulse with 20ns rising time is employed to generate air gas-liquid diffuse discharge plasma with room gas temperature in quartz tube at atmospheric pressure. The image of the discharge and optical emission spectra of active species in the plasma are recorded. The plasma gas temperature is determined to be approximately 390K by compared the experimental spectra with the simulated spectra, which is slightly higher than the room temperature. The result indicated that the gas temperature rises gradually with pulse peak voltage increasing, while decreases slightly with the electrode gap distance increasing. As an important application, bipolar nanosecond pulse discharge is used to sterilize the common microorganisms (Actinomycetes, Candida albicans and Escherichia coli) existing in drinking water, which performs high sterilization efficiency.
Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
Sen
S
Wang
Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, China. Electronic address: wangwenc@dlut.edu.cn.
Wen-chun
WC
Wang
Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
De-zheng
DZ
Yang
Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
Zhi-jie
ZJ
Liu
Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
Shuai
S
Zhang
D001274:Atmospheric Pressure; D004058:Diffusion; D060766:Drinking Water / Q000382:microbiology*; D004867:Equipment Design; D006358:Hot Temperature; D058626:Plasma Gases / Q000737:chemistry*; D013242:Sterilization / Q000295:instrumentation*; D018508:Water Purification / Q000295:instrumentation*
D060766:Drinking Water; D058626:Plasma Gases
Gas–liquid diffuse discharge; Nanosecond pulse; Room temperature plasma; Water sterilization