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dielectric barrier discharge Plasma-Induced Photocatalysis and Ozonation for the Treatment of Wastewater

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Plasma Science and Technology 2008年第1期10卷 100-105页

作者： MOK YoungSun JO Jin-Oh LEE Heon-Ju Department of Chemical Engineering Cheju National University Jeju 690-756 South Korea Department of Energy Engineering Cheju National University Jeju 690-756 South Korea

The physicochemical processes of dielectric barrier discharge （DBD） such as insitu formation of chemically active species and emission of ultraviolet （UV）/visible light were utilized for the treatment of a simulated wastewater formed with Acid Red 4 as the model organic contaminant. The chemically active species （mostly ozone） produced in the DBD reactor were well distributed in the wastewater using a porous gas diffuser, thereby increasing the gas-liquid contact area. For the purpose of making the best use of the light emission, a titanium oxide-based photocatalyst was incorporated in the wastewater treating system. The experimental parameters chosen were the voltage applied to the DBD reactor, the initial pH of the wastewater, and the concentration of hydrogen peroxide added to the wastewater. The results have clearly shown that the present system capable of degrading organic contaminants in two ways （photocatalysis and ozonation） may be a promising wastewater treatment technology.

关键词： dielectric barrier discharge ozone ultraviolet light photocatalyst wastewater

Effects of Airflows on dielectric barrier discharge in Air at Atmospheric Pressure

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Plasma Science and Technology 2009年第2期11卷 177-180页

作者：王战任春生聂秋月王德真 State Key Laboratory for Materials Modification by Laser Ion and Electron BeamsDalian University of Technology

Effect of airflow on the dielectric barrier discharge in ambient air at atmospheric pressure is presented. The influence of airflow on the spatial distribution and intensity of a discharge were investigated experimentally. A critical frequency of 1 kHz was found. With the frequency above 1 kHz, when a fast airflow was introduced into the discharge gap, the discharge patterns varied from filaments to curved stripes and the curvature degree rose with an increase in the airflow speed. At the same time, the discharge intensity decreased. However with the discharge frequency below 1 kHz, the discharge intensity would get greater with an increase in the airflow speed.

关键词： plasma airflows dielectric barrier discharge

Effect of insulating oil covering electrodes on the characteristics of a dielectric barrier discharge

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Plasma Science and Technology 2020年第11期22卷 36-41页

作者： Trung Nguyen TRAN Bounyang OANTHAVINSAK Shinichiro KADO Hiroto MATSUURA Department of Quantum and Radiation Engineering Graduate School of EngineeringOsaka Prefecture UniversitySakaiOsaka 599-8570Japan Institute of Advanced Energy Kyoto UniversityUjiKyoto 611-0011Japan

In this study,the effects of the fluid cooling and electric field line deformation were investigated in a dielectric barrier discharge(DBD)plasma *** DBD plasma jet is improved by covering the ground electrode and a power electrode with insulating *** obtained positive results as insulating oil prevents arc formation,while it improved the supplied power and plasma jet length,and increased radical *** production of this nonthermal plasma jet is studied with polyvinyl alcohol-potassium iodide liquid.

关键词： atmospheric pressure plasma jet APPJ Lissajous figure dielectric barrier discharge plasma plume

Measurement of OH Radicals in dielectric barrier discharge Plasmas by Cavity Ring-Down Spectroscopy

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Plasma Science and Technology 2010年第2期12卷 166-171页

作者：赵国利朱爱民吴家婷刘忠伟徐勇 Laboratory of Plasma Physical Chemistry Dalian University of Technology Dalian 116024 China Laboratory of Materials Modification by Beams Dalian University of Technology Dalian 116024 China

Near-infrared continuous wave cavity ring-down spectroscopy was applied to mea- sure the OH radicals in dielectric barrier discharge plasmas, which play an important role in combustion systems, atmospheric chemistry and the removal of air pollutants by non-thermal plasmas. The P-branches of OH X2YIi （vI ： 2 ＋-- it 0） bands were used for number density measurements. The OH number density and plasma temperature were determined for different applied voltages, gas pressures and concentrations of both oxygen and water. The temporal evolu- tion of the OH number density was obtained by using the ＂time window＂ method, which was used to extract individual ring-down times at different times in a half period of the sine wave applied voltage in dielectric barrier discharge plasmas.

关键词： OH dielectric barrier discharge plasma cavity ring-down spectroscopy

Realization of homogeneous dielectric barrier discharge in atmospheric pressure argon and the effect of beads on its characteristics

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Plasma Science and Technology 2023年第5期25卷 77-84页

作者：冉俊霞张雪雪张宇吴凯玥赵娜何兴然代秀红梁启航李雪辰 College of Physics Science and Technology Hebei UniversityBaoding 071002People’s Republic of China Institute of Life Science and Green Development Hebei UniversityBaoding 071002People’s Republic of China School of Mathematics and Physics Handan UniversityBaoding 071002People’s Republic of China

This paper describes the realization of a homogeneous dielectric barrier discharge(DBD)in argon at atmospheric *** effect of the morphology of the dielectric surface(especially the dielectric surface covered by hollow ceramic beads(99%Al_(2)O_(3))with different diameters)on discharge is *** different dielectrics,the argon DBD presents two discharge modes:a filamentary mode and a homogeneous *** photography shows that the filamentary mode operates in a streamer discharge,and the homogeneous mode operates in a Townsend discharge *** is found that a homogeneous discharge can be generated within a certain voltage *** voltage amplitude range decreases,and the breakdown voltage increases with the increase in the mean diameter of the ceramic *** of the total current and optical emission signal present stochastic pulses per half voltage cycle for the filamentary mode,whereas there is one single hump per half voltage cycle for the homogeneous *** the homogeneous mode,the intensity of the optical emission decreases with the mean diameter of the ceramic *** optical emission spectrum is mainly composed of atomic lines of argon and the second positive system of molecular *** reveals that the electron density decreases with the increasing mean diameter of the ceramic *** vibrational temperature increases with the increasing mean diameter of the ceramic *** is believed that a large number of microdischarges are formed,and smaller ceramic beads have a larger activation surface area and more point *** liberated in the shallow well and electrons generated from microdischarges can increase the secondary electron emission coefficient of the cathode and provide initial electrons for discharge ***,the breakdown electric field is reduced,which contributes to easier generation of homogeneous *** is confirmed by the simulation results.

关键词： dielectric barrier discharge homogeneous discharge Townsend discharge microdischarge secondary electron emission

Study of Humidity Effect on Benzene Decomposition by the dielectric barrier discharge Nonthermal Plasma Reactor

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Plasma Science and Technology 2016年第6期18卷 686-692页

作者：马天鹏赵琼刘建奇钟方川 College of Environmental Science and Engineering Donghua University College of Electrical and Information Engineering Beifang University of Nationalities College of Science Donghua University

The humidity effects on the benzene decomposition process were investigated by the dielectric barrier discharge（DBD） plasma *** results showed that the water vapor played an important role in the benzene oxidation *** was found that there was an optimum humidity value for the benzene removal efficiency,and at around 60% relative humidity（RH）,the optimum benzene removal efficiency was *** a SIE of 378 J/L,the removal efficiency was 66% at 0% RH,while the removal efficiency reached 75.3% at 60% RH and dropped to 69% at 80% ***,the addition of water inhibited the formation of ozone and NO2 *** of the concentrations of ozone and NO2 decreased with increasing of the RH at the same specific input *** a SIE of 256 J/L,the concentrations of ozone and NO2 were 5.4 mg/L and 1791 ppm under dry conditions,whereas they were only 3.4 mg/L and 1119 ppm at 63.5%RH,***,the outlet gas after benzene degradation was qualitatively analyzed by FT-IR and GC-MS to determine possible intermediate *** results suggested that the byproducts in decomposition of benzene primarily consisted of phenol and substitutions of *** on these byproducts a benzene degradation mechanism was proposed.

关键词： relative humidity nonthermal plasma benzene decomposition dielectric barrier discharge

Effects of dielectric barrier discharge Plasma Treatment on Pentachlorophenol Removal of Granular Activated Carbon

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Plasma Science and Technology 2013年第10期15卷 1059-1065页

作者： JI Puhui QU Guangzhou LI Jie College of Resources and Environment Northwest Agriculture and Forestry UniversityYangling 712100 China Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture Yangling 712100 China Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education Dalian 116024 China

The pentachlorophenol （PCP） adsorbed granular activated carbon （GAC） was treated by dielectric barrier discharge （DBD） plasma. The effects of DBD plasma on the structure of GAC and PCP decomposition were analyzed by N2 adsorption, thermogravimetric, scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS） and gas chromatographymass spectrometry （GC-MS）. The experimental data of adsorption kinetics and thermodynamics of PCP on GAC were fitted with different kinetics and isotherm models, respectively. The results indicate that the types of N2 adsorption isotherm of GAC are not changed by DBD plasma, while the specific surface area and pore volume increase after DBD plasma treatment. It is found that the weight loss of the saturated GAC is the highest, on the contrary, the weight loss of DBD treated GAC is the least because of reduced PCP residue on the GAC. The XPS spectra and SEM image suggest that some PCP on the GAC is removed by DBD plasma, and the surface of GAC treated by DBD plasma presents irregular and heterogeneous morphology. The GC-MS identification of by-products shows that two main dechlorination intermediate products, tetrachlorophenol and trichlorophenol, are distinguished. The fitting results of experimental data of adsorption kinetics and thermodynamics indicate that the pseudo-first-order and pseudo-second order models can be used for the prediction of the kinetics of virgin GAC and DBD treated GAC for PCP adsorption, and the Langmuir isotherm model fits better with the data of adsorption isotherm than the Freundlich isotherm in the adsorption of PCP on virgin GAC and DBD treated GAC.

关键词： granular activated carbon dielectric barrier discharge plasma adsorption pentachlorophenol decomposition

Direct and Indirect Applications of dielectric barrier discharge Plasma to Catalytic Reduction of Nitrogen Oxides from Exhaust Gas

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Plasma Science and Technology 2006年第2期8卷 207-212页

作者： YOUNG Sun Mok Department of Chemical Engineering Cheju National University Jeju 690-756 Korea

dielectric barrier discharge （DBD） plasma was utilized to oxidize NO contained in the exhaust gas to NO2, ultimately improve the selective catalytic reduction of nitrogen oxides （NOx）. In the one case, DBD was created directly in the exhaust gas （direct application）, and in the an other case, ozone produced by DBD was injected into the exhaust gas （indirect application）. A comparative study between such direct and indirect applications of DBD plasma was made in terms of the NOx removal efficiency and the energy consumption. The NO2 content in the exhaust gas was changed by the voltage applied to the DBD device （for direct application） or by the amount of ozone added to the exhaust gas （for indirect application）. In both cases, NO was easily oxidized to NO2, and the change in NO2 content largely affected the NOx removal performance of the catalytic reactor placed downstream, where both NO and NO2 were reduced to N2 in the presence of ammonia as the reducing agent. The experiments were primarily concerned with the effect of reaction temperature on the catalytic NOx reduction at various NO2 contents. The direct and indirect applications of DBD were found to remarkably improve the catalytic NOx reduction, especially at low temperatures.

关键词： dielectric barrier discharge ozone catalytic reduction nitrogen oxides

UAV flight test of plasma slats and ailerons with microsecond dielectric barrier discharge

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Chinese Physics B 2018年第10期27卷 455-464页

作者： Zhi Su Jun Li Hua Liang Bo-Rui Zheng Biao Wei Jie Chen Li-Ke Xie Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi＇an 710038China School of Automation and Information Xi＇an University of TechnologyXi＇an 710048China

Plasma flow control（PFC） is a promising active flow control method with its unique advantages including the absence of moving components, fast response, easy implementation, and stable operation. The effectiveness of plasma flow control by microsecond dielectric barrier discharge（μs-DBD）, and by nanosecond dielectric barrier discharge（NS-DBD） are compared through the wind tunnel tests, showing a similar performance between μs-DBD and NS-DBD. Furthermore, theμs-DBD is implemented on an unmanned aerial vehicle（UAV）, which is a scaled model of a newly developed amphibious plane. The wingspan of the model is 2.87 m, and the airspeed is no less than 30 m/s. The flight data, static pressure data,and Tufts images are recorded and analyzed in detail. Results of the flight test show that the μs-DBD works well on board without affecting the normal operation of the UAV model. When the actuators are turned on, the stall angle and maximum lift coefficient can be improved by 1.3° and 10.4%, and the static pressure at the leading edge of the wing can be reduced effectively in a proper range of angle of attack, which shows the ability of μs-DBD to act as plasma slats. The rolling moment produced by left-side μs-DBD actuation is greater than that produced by the maximum deflection of ailerons,which indicates the potential of μs-DBD to act as plasma ailerons. The results verify the feasibility and efficacy of μs-DBD plasma flow control in a real flight and lay the foundation for the full-sized airplane application.

关键词： plasma flow control flight test dielectric barrier discharge UAV