Resolution of Formaldehyde Solution by Atmospheric Pressure Low Temperature Helium and Oxygen Mixture Gas Plasma Generated in Water

Abstract

In this study, atmospheric pressure low temperature plasma was generated by using a high voltage pulse power supply (1 – 10 kV, 20 kHz) under the water. Helium gas and oxygen gas were flow into between parallel flat electrodes with glass plates to produce a dielectric barrier glow discharge. Using this plasma, the formaldehyde solution was decomposed. The decomposition rate of formaldehyde was up to about 33% when treated for 6 hours, with underwater plasma generated under the conditions of applied voltage: 10 kV, He gas flow rate: 80 sccm, O₂ gas flow rate: 15 sccm.