Degradation of Acid Orange Ⅱ using Negative Pulsed Discharge Plasma from a Nozzle-Cylinder Electrode Coated with TiO2
作者单位：Institute of Electrostatics Shanghai Maritime University
会议名称：《中国物理学会第十八届全国静电学术会议》
会议日期：2013年
学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学]
基 金：supported by grants from the National Natural Science Foundation of China(51207089) Shanghai Maritime University(20120097)
关 键 词：Nozzle-cylinder electrode Discharge plasma Negative pulsed discharge Acid Orange Ⅱ Degradation rate
摘 要：Multiple effects generated in pulsed discharge, such as ultraviolet light, strong electric fields, shock waves and active species, can be used to treat wastewater effectively. In order to improve the efficiency of the removing the pollutants by the discharge plasma technology, TiO2 photo-catalyst has been added to the pulsed discharge process.A negative pulsed discharge system containing a nozzle discharge electrode coated with TiO2 is used to degrade azo dye Acid Orange Ⅱ. The effects of peak value of the high-voltage pulse, pulse repetition rate, initial concentration of Acid Orange Ⅱ, initial solution p H, and treatment time on the degradation of Acid Orange Ⅱ are investigated using nozzle discharge electrode with and without a TiO2 coating in the experiments. The degradation of Acid Orange Ⅱ in the gas phase, liquid phase and gas-liquid phase discharge are compared by changing the relative position between the nozzle electrode and the surface of the *** degradation of Acid Orange Ⅱ increases with peak value of the highvoltage pulse, pulse repetition rate and treatment time. The degradation of Acid Orange Ⅱ increases when the discharge electrode is positioned on the surface of the solution, rather than in air or solution. The degradation of Acid Orange Ⅱ decreases as its initial concentration increases, and also depends on pH;it was higher under acidic conditions than neutral or alkaline. The results reveal that this system effectively removes Acid Orange Ⅱ from wastewater. The degradation of Acid Orange Ⅱ increases by 5 % when the nozzle discharge electrode is coated with TiO2.