Enhanced Degradation of Acid Orange 7 Solution by Non-thermal Plasma Discharge with TiO2

The combination of TiO2 photocatalyst with non-thermal gliding arc discharge for the degradation of organic pollutant Acid Orange 7 (AO7) was studied in aqueous solution. The effects of different parameters including initial concentration of TiO2, carrier gas source and initial pH value were studied. The variations of H2O2, O3 and OH· active species and catalytic performance of reusing TiO2 were also investigated. It was shown that the optimum conditions for AO7 were TiO2 concentration of 1.0 g/L, oxygen as the carrier gas, and the initial pH value at acidic or basic. The crystal type of TiO2 didn’t changed after repeated three times.