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 O
₃
/H
₂
O
₂
method is widely used to form OH radials for AOP; however, this method needs a continuous H
₂
O
₂
supply. The continuous generation of H
₂
O
₂
using plasma is appropriate for the O
₃
/H
₂
O
₂
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 H
₂
O
₂
. The experimental results show that low-voltage-driven and long pulsewidth plasma is best for H
₂
O
₂
generation. The highest H
₂
O
₂
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-
$\mu \text{s}$
pulsewidth.