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

摘要

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.