Generation of reactive species in atmospheric pressure dielectric barrier discharge with liquid water

Zelong ZHANG (张泽龙); Jie SHEN (沈洁); Cheng CHENG (程诚); Zimu XU (许子牧); Weidong XIA (夏维东)

doi:10.1088/2058-6272/aaa437

Plasma Science and Technology > 2018 > 20(4): 44009-044009. > DOI: 10.1088/2058-6272/aaa437

Zelong ZHANG (张泽龙), Jie SHEN (沈洁), Cheng CHENG (程诚), Zimu XU (许子牧), Weidong XIA (夏维东). Generation of reactive species in atmospheric pressure dielectric barrier discharge with liquid water[J]. Plasma Science and Technology, 2018, 20(4): 44009-044009. DOI: 10.1088/2058-6272/aaa437

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Generation of reactive species in atmospheric pressure dielectric barrier discharge with liquid water

1 Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, People’s Republic of China 2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 3 Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 4 School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China

Funds: This work was jointly supported by the Science Foundation of the Institute of Plasma Physics, the Chinese Academy of Sciences (No. DSJJ-14-YY02), National Natural Science Foundation of China (Grant Nos. 11475174 and 51777206).

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Received Date: September 29, 2017

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Abstract

Abstract

Atmospheric pressure helium/water dielectric barrier discharge (DBD) plasma is used to investigate the generation of reactive species in a gas–liquid interface and in a liquid. The emission intensity of the reactive species is measured by optical emission spectroscopy (OES) with different discharge powers at the gas–liquid interface. Spectrophotometry is used to analyze the reactive species induced by the plasma in the liquid. The concentration of OH radicals reaches 2.2 μm after 3 min of discharge treatment. In addition, the concentration of primary long-lived reactive species such as H₂O₂, NO₃^- and O₃ are measured based on plasma treatment time. After 5 min of discharge treatment, the concentration of H₂O₂, NO₃^-, and O₃ increased from 0 mg· L^-1 to 96 mg·L^-1, 19.5 mg·L^-1, and 3.5 mg·L^-1, respectively. The water treated by plasma still contained a considerable concentration of reactive species after 6 h of storage. The results will contribute to optimizing the DBD plasma system for biological decontamination.

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References (39)

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