Atmospheric pressure helium plasma jet and its applications to methylene blue degradation

Abstract

The optical and electrical characteristics of atmospheric pressure He plasma are investigated. The optical emission at the plasma-solution interface confirms the existence of active radicals such as O⋅H, O⋅ and H⋅. The dissipated power was estimated with Lissajous figure. The plasma plume length reaches a maximum length at flow rate of 7.5 L/min, which is accompanied by a peak value of dissipated power and currents. The Trot and Tvib decrease as He flow rate increases at a fixed discharge voltage. The degradation efficiency and decolorization of MB solution were found to be strongly dependent on the He flow rate.