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Spectroscopic diagnosis of plasma in atmospheric pressure negative pulsed gas-liquid discharge with nozzle-cylinder electrode

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Plasma Science and Technology 2018年第5期20卷 30-35页

作者： Ming SUN Zhan TAO Zhipeng ZHU Dong WANG Wenjun PAN Institute of Electrostatics Shanghai Maritime UniversityShanghai 201306People＇s Republic of China Department of Electrical Automation Shanghai Maritime UniversityShanghai 201306People＇s Republic of China

The plasma characteristics of a gas-liquid phase discharge reactor were investigated by optical and electrical *** nozzle-cylinder electrode in the discharge reactor was supplied witha negative nanosecond pulsed *** optical emission spectrum diagnosis revealed that OH（A2∑＋ → X2Π,306–309 nm）,N32（CΠ→B3Πg,337 nm）,O（3p5p→3s-5s-0,777.2 nm）and O（3p3p→3s3s0,844.6 nm）were produced in the discharge plasma *** electron temperature（Te）was calculated from the emission relative intensity ratio between the atomic O 777.2 nm and 844.6 nm,and it increased with the applied voltage and the pulsed frequency and fell within the range of 0.5–0.8 e *** gas temperature（Tg）that was measured by Lifbase was in a range from 400 K to 600 K.

关键词： gas-liquid negative pulsed discharge discharge plasma reactivate species nozzle-cylinder electrode diagnosis

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Degradation of Acid Orange Ⅱ using Negative Pulsed Discharge Plasma from a nozzle-cylinder electrode Coated with TiO2

Degradation of Acid Orange Ⅱ using Negative Pulsed Discharg...

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中国物理学会第十八届全国静电学术会议

作者： SUN Ming WANG Shaoqi ZHANG Ying Institute of Electrostatics Shanghai Maritime University

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.

关键词： nozzle-cylinder electrode Discharge plasma Negative pulsed discharge Acid Orange Ⅱ Degradation rate

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