Oxidative Decoloration of Dyes by Pulsed Discharge Plasma over a Water Surface under Argon Atmospheric

抄録

Pulsed discharge plasma is typical oxidation technologies for disposing organic compounds in aqueous solutions. In this paper, electric field generated by pulsed high-voltage discharge plasma over water surface has been performed under argon atmosphere to degrade dye compounds. The effects of various parameters with pulsed high-voltage arc discharge plasma are studied for decoloration of Orange G, Orange II, Congo Red, Naphthol Blue Black. The experiments were conducted at 313 K and 0.2 MPa using a batch type reactor. Intermediate compounds from the degradation of dyes in the aqueous products were analyzed by UV-Vis (ultra violet -visible) spectrophotometer. The dyes degradation increases with increasing peak pulse voltage applied which leads to the formation of its derived compounds. The decoloration rate significantly increased also with the number of pulse discharge plasma. When the number of discharge plasma was 20000x with 9 kV peak pulse voltage applied, the degradation of Orange G, Orange II, Congo Red, and Naphthol Blue Black could approach to 50.81 wt%, 41.64 wt%, 56.41 wt%, and 53.25 wt%, respectively.