Removal of Organic Pollutants in Water by a Nanosecond Pulsed Sliding Discharge

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Environmentally persistent organic pollutants have become a concern to the sustainability of the environment, and many of them are harmful to human health. This work explores the feasibility of a lowtemperature plasma-based technology for the degradation of organic pollutants such as Rhodamine-B (Rh-B) and trifluoroacetic acid (TFA) in water. Applying 300-ns, 20 kV pulses at 500 Hz to a strip line-like electrode configuration, sliding discharges are generated at the gas-water interface in one atmospheric air or nitrogen above contaminated water. An average Rh-B reduction of 30% and 19% were achieved with air and nitrogen, respectively, when 20 μM of Rh-B solution flew through the reactor at a flow rate of 1 mL/s, Over 90% degradation of Rh-B was obtained after 9 cycles of treatment of the plasma operated at 0.12 J per pulse or an average power of 60 W using ambient air as the working gas. The impact of the voltage, working gas, and initial concentration of the organic pollutants on the degradation rate and energy efficiency are discussed. This work demonstrates that the nanosecond sliding discharge-based plasma reactor is a promising technology for water purification and the removal of organic compounds.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.