Abstract
Nanosecond pulse power is employed to excite a N2/O2 bubble discharge using hollow needle electrode underwater at atmospheric pressure. The discharge images, waveforms of applied voltage and discharge current, and optical emission spectra are recorded to investigate plasma characteristics and diagnose the active species in the discharge region with varying O2/N2 proportion, and the spectrophotometry is applied to measure the H2O2 concentration in the liquid phase. A glow-like discharge is obtained with bubbling N2, whereas the discharge transfers to a filament mode when mixing O2, and obvious filament regime is built when the volume proportion of O2 is above 80%. With the increase of O2 proportion, the emission intensity of O increases rapidly but that of OH decreases sharply. The effects of pulse voltage and pulse repetition on emission intensity are studied to optimize discharge parameters. The liquid pH values have an uptrend within plasma treatment for 30 s and then decrease with increasing treatment time.
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