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Abstract A continuous gas–liquid flowing film reactor with a nanosecond‐pulsed power supply was utilized for the degradation of perfluorooctanoic acid (PFOA) as assessed by fluoride (F−) formation. PFOA, 50 mg/L, dissolved in deionized water was supplied at 2 ml/min with an argon carrier gas. The liquid phase was analyzed for F−using ion chromatography. The power supply pulse frequency (f) was varied between 0.25‐ and 10‐kHz using a constant 16‐kV input voltage and 40‐ns pulse width. The highest F−production rate (), 1.57 × 10−8 mol/s, occurred at 5 kHz whereas the highest efficiency of F−production (), 9.12 × 10−9 mol/J, was found at 0.25 kHz.
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null (Ed.)The influence of pulse frequency (1−60 kHz) in a nanosecond filamentary discharge propagating along a flowing liquid water film was assessed with regards to the formation of chemical species with argon and helium carrier gasses. The production rate and energy yield for H₂O₂ and H₂ were measured for both carrier gases, and O₂ formation was determined for helium. The effect of pulse frequency on the energy dissipated per pulse as well as electron density was also investigated. The results indicate that the energy yield for H₂O₂ decreases with increasing pulse frequency while the energy yields of H₂ and O₂ remain relatively unaffected. It is proposed that the difference in the trends of the liquid versus the significantly longer residence time of the liquid phase allowing for more degradation of formed hydrogen peroxide before it is able exit the reactor.more » « less
