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Activated persulfate by dbd plasma and activated carbon for the degradation of acid orange Ⅱ

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Plasma Science and Technology 2020年第3期22卷 59-65页

作者： Weigang CHEN Haixia WU Jiawei FAN Zhi FANG Shaohua LIN College of Urban Construction Nanjing Tech UniversityNanjing 211816People’s Republic of China School of Automation and Electrical Engineering Nanjing Tech UniversityNanjing 211816People’s Republic of China School of Civil Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China

In this study, the effect of activated peroxydisulfate(PDS) by dielectric barrier discharge(dbd) plasma and activated carbon(HGAC) on the removal of acid orange Ⅱ(AOⅡ) was investigated. The effects of applied voltage, PDS dosage, HGAC dosage, initial pH value, and inorganic anions on the removal rate of AOⅡ were discussed. The main free radicals degrading azo dyes during the experiment were also studied. Experimental results show that the removal rate of AOⅡ in dbd/HGAC/PDS synergistic system is much higher than that in the single system. With the applied voltage of 16 kV, HGAC dosage of 1 g l-1, PDS and AOⅡ molar ratio of 200:1, initial pH value of 5.4 and concentration of AOⅡ solution of 20 mg l-1, the removal rate of AOⅡ reached 97.6% in dbd/HGAC/PDS process after 28 min of *** and neutral conditions are beneficial for AOⅡ removal. Sulfate and hydroxyl radicals play an important role in the removal of AOⅡ. Inorganic anions are not conducive to the removal of AOⅡ.

关键词： dbd plasma activated carbon persulfate sulfate radical acid orange Ⅱ

Ozone generation enhanced by silica catalyst in packed-bed dbd reactor

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Plasma Science and Technology 2021年第8期23卷 89-94页

作者： Xin ZENG Yafang ZHANG Liangyin GUO Wenquan GU Ping YUAN Linsheng WEI School of Resources Environmental&Chemical Engineering Nanchang UniversityNanchang 330031People's Republic of China

In this paper,three dielectric barrier discharge(dbd)configurations,which were plain dbd with no packing,dbd with packed pure quartz fibers and dbd with packed loaded quartz fibers,were employed to investigate the effect and catalytic mechanism of catalyst materials in a packed-bed ozone *** the experimental results,it was clear that the dbd configuration with packed pure fibers and packed loaded fibers promotes ozone *** the packed-bed reactor,ozone concentration and ozone yield were enhanced by an increase of electric field in the discharge gap with the packed-bed ***,the enhancement of ozone concentration and yield for the dbd reactor packed by loaded fibers with silica nanoparticles was due to the catalysis of silica nanoparticles on the fiber *** adsorption of silica nanoparticles on the fiber surface can prolong the retention time of active species and enhance surface reactions.

关键词： dbd ozone generation packed-bed reactor silica catalysis surface reaction

Classification and uniformity optimization of mesh-plate dbd and its application in polypropylene modification

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Plasma Science and Technology 2019年第5期21卷 51-59页

作者： Yan HUI Na LU Pengzhen LUO Kefeng SHANG Nan JIANG Jie LI Yan WU School of Electrical Engineering Dalian University of Technology

The classification of spatial characteristics and discharge modes of dielectric barrier discharge(dbd)are gaining increasing attention in industrial applications,especially in the field of surface treatment of *** this work,gray level histogram(GLH)and Fourier energy spectrum based on the digital image processing tech no logy are applied to investigate the spatial structure and discharge mode of mesh-plate *** coefficient of variation(CV)is calculated to describe the uniformity of the *** results show that the discharge mode of mesh-plate dbd changes from periodic discharge to filamentary discharge when the applied voltage increases from 11-15 ***,a more regular spatial structure is obtained under lower applied voltages during the discharge *** is also found that the apertures of mesh electrodes which are below 1 mm have smaller values of CV compared to plate electrodes,indicating more uniform ***,polypropylene is treated by mesh-plate dbd for surface *** hydrophilicity is significantly improved as the water contact angle decreased by 64°,and the dyeing depth is also enhanced.

关键词： mesh-plate dbd gray level histogram Fourier energy spectrum CV surface modification

High-Sensitivity In-Situ Diagnosis of NO_2 Production and Removal in dbd Using Cavity Ring-Down Spectroscopy

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Plasma Science and Technology 2014年第2期16卷 142-148页

作者：吴兴伟李聪张辰飞丁洪斌 Key Laboratory of Materials Modification by Laser Ion and Electron BeamsChinese Ministry of EducationSchool of Physics and Optical Electronic TechnologyDalian University of Technology

A highly-sensitive in-situ diagnosis approach for nitrogen dioxide （NO2） has been developed in dielectric barrier discharge （dbd） based on pulsed cavity ring-down spectroscopy （CRDS）. Absorption bands of NO2 in a spectral region from 508 nm to 509 nm were used, and a detection limit of 17.5 ppb was achieved. At this level of sensitivity, the quantitative and real-time monitoring of the production and removal of NO2 are accomplished for the first time in the discharge region. By measuring the removal amount and rate at different NO2 initial number densities from 1.54 ×10^13 cm^-3 to 2.79 × 10^14 cm^-3, we determined the relationship between them and NO2 initial number densities. The removal amount linearly increases with the initial number density, while the removal rate increases logarithmically. At a lower initial number density, the removal rate is limited. By considering the chemical kinetic mechanism in plasma, a qualitative explanation for the above phenomena is proposed： the additional NO2 produced by discharge limits the removal rate, since the NO2 concentration is dominated by the competition between the forward reactions （production） and the reverse reactions （removal）.

关键词： dbd CRDS NO2 production NO2 removal

Insight into the remaining high surface energy of atmospheric dbd plasma-treated polyethylene web after three months' aging

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Plasma Science and Technology 2019年第1期21卷 79-86页

作者： Hua LI Zhengduo WANG Lizhen YANG Qiang CHEN Laboratory of Plasma Physics & Materials Beijing Institute of Graphic Communication

In this paper, we report the modification of polyethylene(45 μm in thickness) webs through a roll-to-roll dielectric barrier discharge plasma treatment in an open atmospheric *** work differs from the normal adopted corona discharge treatment at an atmospheric pressure, in that three monomers: allylamine, acrylic acid, and ethanol, are inlet into the discharge zone by argon(Ar) carrier gas. As a comparison, Ar plasma treatment is also carried out. We focus on the aging properties of treated plastics in the open air. It is found that the modified webs can retain the surface energy as high as 50.0?±?1 mN m^(-1) for more than three months. After characterization of the as-prepared and aged samples by the surface roughness, the wettability, and the chemical structure, the mechanism of retaining high surface energy is then presumed. We think that the initial high surface energy just after plasma treatment is correlated to the grafted functional groups, while the over 50.0 mN m^(-1) remaining surface energy after three month aging is due to the stable concentrations of oxygen-contained and nitrogencontained groups by post-reaction on the surfaces.

关键词： aging atmospheric dbd treatment polyethylene surface energy remaining

Experimental study on the characteristics of dbd plasma coal liquefaction by using coal nanopowder

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Plasma Science and Technology 2019年第11期21卷 86-92页

作者： Song Chol PAK Kuk Song HAN Yong Jun KIM Hak Chol CHOE Faculty of Physical Science Kimchaek University of Technology

A new method for liquefying coal using dielectric barrier discharge plasma has been *** utilizing waste oil as the solvent and processing coal nano powder in the plasma for 10 min,we have attained a liquid yield of more than 80%.The experiment shows that not only the coal nanopowder promoted the liquefaction process,but hydrogen radicals improved the liquid yield *** the plasma processing,the phenomenon of the changing color of the nanopowder solution and not producing a solid residue has been obviously *** rational parameters that affected the liquefaction of coal nanopowder have been achieved through the experiment,and the liquefied products have been analyzed.

关键词： liquefaction dbd plasma coal nanopowder

Plasma induced degradation of Indigo Carmine by bipolar pulsed dielectric barrier discharge(dbd) in the water-air mixture

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Journal of Environmental Sciences 2004年第5期16卷 808-812页

作者： ZHANGRuo-bing WUYan LIGuo-feng WANGNing-hui LIJie InstituteofElectrostaticandSpecialPower DalianUniversityofTechnologyDalian116024China

Degradation of the Indigo Carmine(IC) by the bipolar pulsed dbd in water-air mixture was studied. Effects of various parameters such as gas flow rate, solution conductivity, pulse repetitive rate and ect., on color removal efficiency of dying wastewater were investigated. Concentrations of gas phase O 3 and aqueous phase H 2O 2 under various conditions were measured. Experimental results showed that air bubbling facilitates the breakdown of water and promotes generation of chemically active species. Color removal efficiency of IC solution can be greatly improved by the air aeration under various solution conductivities. Decolorization efficiency increases with the increase of the gas flow rate, and decreases with the increase of the initial solution conductivity. A higher pulse repetitive rate and a larger pulse capacitor C\-p are favorable for the decolorization process. Ozone and hydrogen peroxide formed decreases with the increase of initial solution conductivity. In addition, preliminary analysis of the decolorization mechanisms is given.

关键词： water treatment water-air mixture dbd Indigo Carmine

Titanium Alloy Surface Modification by a Spatio-Temporal Atmospheric Pressure dbd Afterglow

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Plasma Science and Technology 2007年第6期9卷 670-673页

作者： E.PANOUSIS F.CLEMENT J.F.LOISEAU N.SPYROU B.HELD J.LARRIEU F.GUERTON Laboratory of Gas Electronics and Plasmas-Pau University 64000 PauFrance Electrotechnic Materials LaboratoryUniversity of Patras26500 Patras-RioGreece Laboratory of Gas Electronics and Plasmas-Pau University 64000 PauFrance Electrotechnic Materials Laboratory University of Patras26500 Patras-RioGreece Laboratoire Interdisciplinaire de Spectroscopie Electronique University of Namur5000 NamurBelgium

The experimental work reported here is devoted to the study of the modifications inflicted on the surface of titanium alloy specimens by an atmospheric pressure dielectric barrier discharge（dbd） reactor in both spatial and temporal afterglow conditions. A commercially available （AcXys Technologies） modified reactor system was used for the surface treatment of the TiA6V4 titanium alloy that is widely used in the aeronautical industry. Wettability surface characterisation and XPS analyses are performed to give a macroscopic and microscopic insight to the surface modifications. Best operating conditions, at constant input energy, were obtained for a duty cycle equal to 10%.

关键词： dbd titanium alloy atmospheric pressure

Luminous Activity Study of a Long Atmospheric Pressure dbd Afterglow

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Plasma Science and Technology 2007年第6期9卷 678-681页

作者： E.PANOUSIS F.CLEMENT N.SPYROU J.F.LOISEAU C.MONGE B.HELD Laboratory of Gas Electronics and Plasmas-Pau University 64000 PanFrance Electrotechnic Materials LaboratoryUniversity of Patras26500 Patras-RioGreece Laboratory of Gas Electronics and Plasmas-Pau University 64000 PanFrance Electrotechnic Materials Laboratory University of Patras26500 Patras-RioGreece

The experimental work reported here is devoted to the study of the luminous activity of a long dielectric barrier discharge （dbd） afterglow at atmospheric pressure. The discharge plasma is generated in a commercially available （AcXys Technologies） reactor, using a N2 flow of a few tens SL/min, whereas the luminous afterglow when channelled into a quartz tube extends at a distance of 50 cm, finishing in a luminous arrow at the tube＇s exit. The luminous activity of the afterglow is studied by means of photomultiplier scans and optical emission spectroscopy, revealing an interesting transient phase. An attempt is made to correlate this effect with the active species＇ creation and destruction mechanisms.

关键词： dbd flowing afterglow optical emission spectroscopy