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Oxidation Degradation of Aqueous Carbofuran Induced by low temperature plasma

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plasma Science and Technology 2008年第3期10卷 348-351页

作者：蒲陆梅高锦章虎玉森梁慧光肖雯王兴民 Science College of Gansu Agriculture University Lanzhou 730070 China Chemistry Department Northwest Normal University Lanzhou 730070 China

The oxidative degradation of aqueous carbofuran, a heavily used toxic carbamate insecticide by low temperature plasma, was investigated. The results show that the treatment efficiency increases with the increase in initial concentration. Raising the treatment temperature and changing the pH value can result in enhanced degradation of carbofuran in solution. The results also show that low temperature plasma treatment can effectively remove chemical oxygen demand （COD） of carbofuran in the solution.

关键词： carbofuran low temperature plasma oxidative degradation

low temperature plasma Application to Treat Malodor of Sewage Plant

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Low Temperature Plasma Application to Treat Malodor of Sewag...

Inhibiting Effects of Hydrogen Peroxide Induced by low temperature plasma on Melanoma Cells

亚太绿色氧化还原技术国际研讨会

作者： Xu Xiaohong1 Wu Chundu1 2* Chu Jinyu1 2* Zhang Bo1 Chen Zhigang1 1.School of the Environment Jiangsu University Zhenjiang China Jiangsu 212013 2.Jiangsu Provincial Key Laboratory of Modern Agricaltural Equipment and Technology Jiangsu University Zhenjiang

According to the malodor origin and the component of some sewage treatment plant, the article uses the low temperature plasma technology to decompose the malodor. It achieves the controlling goal of m

关键词： low temperature plasma Sewage plant Malodor

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Inhibiting Effects of Hydrogen Peroxide Induced by Low Tempe...

Axial uniformity diagnosis of coaxial surface wave linear plasma by optical emission spectroscopy

第十八届全国等离子体科学技术会议

作者： Jin-ren Liu Xing-min Shi Gui-min Xu Guan-Jun Zhang Environment and Genes Related to Diseases Key Laboratory of Education Ministry School of Public Health State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering

The potential application of low temperature plasma(LTP) in anticancer has attracted great attention from researchers.The mechanism of plasma anticancer action may be related to the reactive oxygen and nitrogen oxygen species generated by LTP.The aim of this study is to identify the inhibiting effects of hydrogen peroxide(H2 O2) induced through plasma-medium interaction on B16 melanoma cells cultured in vitro.For this purpose,helium plasma jet is used to irradiate medium with different time,thereby generating plasma-activated medium(PAM),which is applied to the cancer cells afterwards.Catalase(CAT) is added into PAM to degrade H2 O2 as intervention groups and pure H2 O2 is added into fresh medium as positive group.The content of H2 O2 in medium and cell,cell morphology,cell viability,cell cycle distribution,apoptosis and DNA damage are detected with coumarin boronic acid fluorescence probe,inverted biological microscope observation,3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay,flow cytometry,single cell geleletrophoresis and 8-hydroxy-2-deoxyguanosine(8-OHd G)ELISA kit,respectively.The results show that the content of H2 O2 in PAM increases with prolongation of LTP treatment time after incubation for 0 h and 24 h.However,the intracellular content does not change significantly.MTT assay reveals that the PAM of 75 s treatment causes48.3% growth inhibition,but the rate of that with CAT intervention and H2 O2 group are 13.4%and 41.2%,respectively.The cell morphology results show that the degree of cell damage in 75 s PAM group is equal with the cells in H2 O2 group,whereas the cells in CAT intervention group are normal.Flow cytometer results show that compared with control group,PAM with longer treatment times and pure H2 O2 can cause more cell arresting in G1 phase and apoptosis.But CAT can prevent these changes in cell cycle and cell apoptosis.Single cell geleletrophoresis and8-OHd G assay show that CAT can protect DNA from H2 O2 damage.These findings indicate that H2 O2 induced by LTP in m

关键词： low temperature plasma the reactive oxygen and nitrogen oxygen species

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plasma Science and Technology 2022年第2期24卷 80-92页

作者：张文瑾卫新宇陈龙威林启富江贻满刘成周单家芳 Institute of plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031People's Republic of China

The coaxial surface wave linear plasma with preeminent axial uniformity is developed with the 2.45 GHz microwave generator.By optical emission spectroscopy,parameters of the argon linear plasma with a length over 600 mm are diagnosed under gas pressure of 30 and 50 Pa and different microwave powers.The spectral lines of argon and Hβ(486.1 nm)atoms in excited state are observed for estimating electron excitation temperature and electron density.Spectrum bands in305–310 nm of diatomic OH(Σ-Π+A X22 i)radicals are used to determine the molecule rotational temperature.Finally,the axial uniformity of electron density and electron excitation temperature are analyzed emphatically under various conditions.The results prove the distinct optimization of compensation from dual powers input,which can narrow the uniform coefficient of electron density and electron excitation temperature by around 40%and 22%respectively.With the microwave power increasing,the axial uniformity of both electron density and electron excitation temperature performs better.Nevertheless,the fluctuation of electron density along the axial direction appeared with higher gas pressure.The axial uniformity of coaxial surface wave linear plasma could be controlled by pressure and power for a better utilization in material processing.

关键词： surface wave plasma low temperature plasma optical emission diagnosis

Investigation of stimulated growth effect using pulsed cold atmospheric plasma treatment on Ganoderma lucidum

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plasma Science and Technology 2022年第11期24卷 106-113页

作者：李孟琦黄晓义熊紫兰 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Cold atmospheric plasma(CAP)driven by pulsed high-voltage power has specific advantages in various fields,such as the growth promotion of edible fungi in plasma agriculture.Compared with other strains,Ganoderma lucidum has the significant advantage of high medicinal value,but the shortcomings of low yield,long growth cycle,and an uneven market quality.In this study,Ganoderma lucidum was treated with a CAP powered by a homemade pulsed highvoltage power supply.Three groups of Ganoderma lucidum were treated under different conditions.The stalk lengths and pileus areas of Ganoderma lucidum were recorded to evaluate growth status.Results showed that treatment frequency affected growth status considerably.Ganoderma lucidum was treated with 40 s plasma once a week and showed an improved growth status with a 33.63%increase in average stalk length and a 28%increase in the number of individuals whose pileus areas was greater than the average.Meanwhile,the growth speed was accelerated.However,treatment at an excessive frequency would damage and slow down the growth of Ganoderma lucidum.

关键词： low temperature plasma plasma agriculture edible fungi Ganoderma lucidum stimulated growth

The Solubility of Natural Cellulose After DBD plasma Treatment

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plasma Science and Technology 2008年第6期10卷 743-747页

作者：武军曾凤彩陈炳枪 Beijing Area Major Lab of Printing & Packaging Material and Technology Beijing Institute of Graphic CommunicationBeijing 102600China

Natural cellulose was treated by an atmospheidc DBD plasma. The solubility of cellulose in a diluted alkaline solution after the plasma treatment was investigated. The properties were characterized by X-ray photoelectron spectroscopy （XPS）, Fourier-transform infrared spectroscopy （FTIR） and scanning electron microscopy （SEM）. The results indicated that the surface of cellulose treated by the argon DBD plasma was significantly etched, and the relevant force of hydrogen bonding was decreased. This might be the essential reason for the solubility improvement of natural cellulose in the diluted alkaline solution. Through a comparison of two discharge modes, the atmospheric DBD plasma gun and the parallel plate capacitively coupled DBD plasma, it was found that the atmospheric DBD plasma gun was more effective in fragmentizing the cellulose due to its production of a high energy plasma based on its special structure.

关键词： low temperature plasma natural cellulose surface treatment solubility

Investigation of biomass surface modification using non-thermal plasma treatment

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plasma Science and Technology 2018年第11期20卷 101-107页

作者：林木森 Ahmad Zulazlan Shah ZULKIFLI TNB Research Sdn. Bhd. Research Institution Area 43000 Kajang Selangor Malaysia

The effects of non-thermal plasma （NTP） treatment on biomass in the form of pulverized palmbased empty fruit bunches （EFB） are investigated. Specifically, this study investigates the effects of NTP treatment on the surface reactivity, morphology, oxygen-to-carbon （O/C） ratio of the EFB at varying treatment times. The surface reactivity is determined by the reaction of antioxidant functional groups or reactive species with 2,2-diphenyl-l-picrylhydrazyl （DPPH）. By measuring the concentration of the DPPH with a spectrophotometer, the change in the amount of antioxidant functional groups can be measured to determine the surface reactivity. The reactions of the various lignin components in the EFB with respect to the NTP treatment are discussed by qualitatively assessing the changes in the Fourier transform infrared （FTIR） spectra. The surface morphology is examined by a scanning electron microscope. To determine the amount of oxygen deposited on the EFB by the air-based NTP treatment, the oxygen and carbon contents are measured by an energy dispersive x-ray detector to determine the O/C ratio. The results show that the NTP reactor produced reactive species such as atomic oxygen and ozone, increasing the surface reactivity and chemical scavenging rate of the EFB. Consequently, the surface morphology changed, with an observed rougher surface from the images of the EFB samples. The change in the appearance of the surface is accompanied by a high O/C ratio, and is caused by reactions of certain components of lignin due to the NTP treatment, The lignin component that was modified is believed to be syringyl, as the syringyl portion in the lignin of EFBs is higher compared to the other components. Syringyl components are detected in the range of F-FIR wavenumbers of 1109-1363 cm-1. With increasing NTP treatment times, the absorbance （of the peaks in the PTIR spectra） for syringyl related C-H and lignin associated C=C bonds decreases as the syringyl decomposes. The resulting release of carboxyl compounds increases the absorb

关键词： biomass surface modification empty fruit bunch low temperature plasma lignin components syringyl

Design of Thomson scattering diagnostic system on linear magnetized plasma device

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plasma Science and Technology 2022年第6期24卷 53-56页

作者：徐梦梦张乔枫谢锦林 Department of plasma Physics and Fusion Engineering School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026People's Republic of China CAS Key Lab of Geoscience Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026People's Republic of China

In addition to the magnetic confinement fusion plasma,Thomson scattering has been applied to measure electron density and temperature of low-temperature plasmas.Based on a linear magnetized plasma device,a set of Thomson scattering diagnostic system is designed to diagnose the plasma with n_(e)=10^(18)–10^(19)m^(-3)and T_(e)=2–5eV.Due to low plasma temperature and density,this diagnostic system needs high spectral resolution and collection efficiency to meet the requirements of electron velocity distribution function measurements.Through the bench test,it is confirmed that the spectral resolution reaches 0.01 nm,and theoretical collection efficiency is high enough to obtain a Thomson scattering spectrum by 1000 accumulations.

关键词： Thomson scattering low temperature plasma EVDF

Higher resolution helium measuring system for deuterium plasma on EAST tokamak via normal Penning gauge

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plasma Science and Technology 2017年第1期19卷 90-96页

作者：王厚银胡建生余耀伟曹斌吴金华沈国清万朝 Institute of plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China

Although the deuterium and helium have almost the same mass,a Penning Optical Gas Analyzer（POGA） system on the basis of the spectroscopic method and Penning discharging has been designed on EAST,since 2014.The POGA system was developed successfully in 2015,it was the first time that EAST could detect helium partial pressure in deuterium plasma（wall conditioning and plasma operation scenario）.With dedicated calibration and proper adjustment of the parameters,the minimum concentration of helium in deuterium gas can be measured as about 0.5% instead of 1% on the other tokamak devices.Moreover,the He and D2 partial pressures are measured simultaneously.At present,the measurable range of deuterium partial pressure is 1×10^-7 mbar to 1×10^-5mbar,meanwhile the range of helium is 1×10^-8 mbar to 1×10^-5 mbar.The measurable range can be modified by means of the adjustment of POGA system＇s parameters.It is possible to detect the interesting part of the gas with a time resolution of less than 5 ms（the 200 ms because of conductance of transfer pipe at present）.The POGA system was routinely employed to wall conditioning and helium enrichment investigation in2015.Last but not the least,the low temperature plasma of POGA is generated by normal penning gauge Pfeiffer IKR gauge instead of Alcatel CF2 P,which has been suspended for a few years and was used for almost all the POGA systems in the world.

关键词： penning discharge helium pressure detecting low temperature plasma PMT IKR 251 gauge