Generation of Hydrogen Peroxide in Gas Bubbles Using Pulsed Plasma for Advanced Oxidation Processes

Advanced oxidation process (AOP) is one of the most effective methods of decomposing persistent organic pollutants in water using OH radicals. The O₃/H₂O₂ method is widely used to form OH radials for AOP; however, this method needs a continuous H₂O₂ supply. The continuous generation of H₂O₂ using plasma is appropriate for the O₃/H₂O₂ method, since plasma is readily available anywhere electricity is. This paper presents suitable conditions for pulsed plasma generation in oxygen bubbles for effective and rapid formation of H₂O₂. The experimental results show that low-voltage-driven and long pulsewidth plasma is best for H₂O₂ generation. The highest H₂O₂ generation rate of 61.8 mg/h and energy yield of 2.1 g/kWh were obtained at 2.5-kV voltage, 4-kHz pulse frequency, and 1-μs pulsewidth.