摘要
In this paper,unipolar pulse(including positive pulse and negative pulse)and bipolar pulse voltage are employed to generate diffuse gas–liquid discharge in atmospheric N2with a rumpetshaped quartz tube.The current–voltage waveforms,optical emission spectra of excited state active species,FTIR spectra of exhaust gas components,plasma gas temperature,and aqueous H2O2,NO2-,andNO3-production are compared in three pulse modes,meanwhile,the effects of pulse peak voltage and gas flow rate on the production of reactive species are studied.The results show that two obvious discharges occur in each voltage pulse in unipolar pulse driven discharge,differently,in bipolar pulse driven discharge,only one main discharge appears in a single voltage pulse time.The intensities of active species(OH(A),and O(3p))in all three pulsed discharge increase with the rise of pulse peak voltage and have the highest value at 200 ml min-1of gas flow rate.The absorbance intensities of NO2and N2O increase with the increase of pulse peak voltage and decrease with the increase of gas flow rate.Under the same discharge conditions,the bipolar pulse driven discharge shows lower breakdown voltage,and higher intensities of excited species(N2(C),OH(A),and O(3p)),nitrogen oxides(NO2,NO,and N2O),and higher production of aqueous H2O2,NO2-,andNO3-compared with both unipolar positive and negative discharges.
作者
梁建平
周雄峰
赵紫璐
袁皓
王红丽
王文春
杨德正
Jianping LIANG;Xiongfeng ZHOU;Zilu ZHAO;Hao YUAN;Hongli WANG;Wenchun WANG;Dezheng YANG(Key Lab of Materials Modification(Dalian University of Technology),Ministry of Education,Dalian 116024,People's Republic of China)
基金
supported by National Natural Science Foundation of China(Nos.51977023,51677019,and 11965018)
Fundamental Research Funds for the Central Universities in China(No.DUT18LK42)。