Degradation of acid orange II using negative pulsed discharge plasma from a nozzle-cylinder electrode coated with TiO2

作者：Sun Ming^*; Wang Shaoqi; Zhang Ying

来源：High Voltage Engineering, 2013, 39(10): 2514-2519.

DOI：10.3969/j.issn.1003-6520.2013.10.027

• Acid Orange II
• Degradation rate
• Discharge plasma
• Negative pulsed discharges
• Nozzle-cylinder electrodes
• Treatment time

Many sub-products of pulsed discharge, such as ultraviolet light, strong electric fields, shock waves and active species, are effective in treating wastewater. To improve the efficiency of the discharge plasma technology in removing pollutants, adding TiO2photo-catalyst to pulsed discharges could help. A negative-pulsed-discharge system, which has nozzle discharge electrodes with or without TiO2coating, is used to degrade azo dye Acid Orange II, and the effects of several key conditions (maximum pulse voltage, pulse repetition frequency, initial mass concentration of Acid Orange II initial solution pH, treatment duration, the phase of discharge, and the existence of TiO2) on the degradation are experimentally investigated. The degradation of Acid Orange II increases with maximum pulse voltage, pulse repetition frequency, and treatment duration, and it is larger when putting the discharge electrode on the solution surface than in air or inside the solution, i.e. the discharge in gas phase is more effective than that in gas-liquid phase or liquid phase. The degradation decreases as the initial mass concentration of the solution increases. It also relates to pH and is higher at acidic conditions than at neutral or alkaline conditions. Compared to treatments without TiO2, the ones using the nozzle discharge electrode with TiO2coated increase the degradation of Acid Orange II by 5 %. It is concluded that the proposed system with TiO2added in can remove Acid Orange II from wastewater effectively.

• 出版日期2013
• 单位上海海事大学