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Degradation of tiamulin by a packed bed dielectric barrier plasma combined with TiO_(2)catalyst

Plasma Science and Technology 2022年第9期24卷 117-126页

作者： Kun yang Hongwei SHEN Yueyue LIU yang LIU Pingji GE dezheng yang School of Science Shihezi UniversityShihezi 832003People’s Republic of China Key Laboratory of Environmental Monitoring and Pollutant Control of Xinjiang Bingtuan Shihezi UniversityShihezi 832003People’s Republic of China Key Lab of Materials Modification Dalian University of TechnologyMinistry of EducationDalian 116024People’s Republic of China

Recently,a plasma catalyst was employed to efflciently degrade antibiotic residues in the *** this study,the plasma generated in a packed bed dielectric barrier reactor combined with TiO_(2)catalyst is used to degrade the antibiotic tiamulin(TIA)loaded on the surface of simulated soil *** effects of applied voltage,composition of the working gas,gas flow rate and presence or absence of catalyst on the degradation effect were *** was found that plasma and catalyst can produce a synergistic effect under optimal conditions(applied voltage 25 k V,oxygen ratio 1%,gas flow rate 0.6 l min^(-1),treatment time 5 min).The degradation efflciency of the plasma combined with catalyst can reach 78.6%,which is 18.4%higher than that of plasma without *** the applied voltage is 30 k V,the gas flow rate is 1 l min^(-1),the oxygen ratio is 1%and the plasma combined with TiO_(2)catalyst treats the sample for 5 min the degradation efflciency of TIA reached 97%.It can be concluded that a higher applied voltage and longer processing times not only lead to more degradation but also result in a lower energy *** the oxygen ratio and gas flow rate could improve the degradation *** relative distribution and identity of the major TIA degradation product generated was determined by high-performance liquid chromatography–mass spectrometry *** mechanism of TIA removal by plasma and TiO_(2)catalyst was analyzed,and the possible degradation path is discussed.

关键词： packed bed dielectric barrier discharge plasma catalyst tiamulin(TIA)antibiotics degradation degradation mechanism

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Spectroscopic study of bipolar nanosecond pulse gas-liquid discharge in atmospheric argon

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Plasma Science and Technology 2018年第7期20卷 121-126页

作者： Sen WANG dezheng yang Feng LIU Wenchun WANG Zhi FANG Key Lab of Materials Modification by Laser Ion and Electron BeamsMinistry of EducationDalian University of TechnologyDalian 116024People＇s Republic of China College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211009People＇s Republic of China

Atmospheric gas-liquid discharge with argon as a working gas is presented by employed nanosecond pulse power. The discharge is presented in a glow-like mode. The discharge powers are determined to be less than 1 W, and remains almost constant when the discharge duration time increases. Bountiful active species are determined by capturing optical emission spectra, and their main generation processes are also discussed. The plasma gas temperature is calculated as 350 K by comparing the experimental spectra and the simulated ones of N2（C3Ⅱg→B3Ⅱg, △v=-2）. The time resolved vibrational and rotational temperature is researched to present the stability of discharge when pulse voltage and discharge duration vary. The electron density is determined to be 1016 cm-3 according to the Stark broadening effect of the Ha line.

关键词： nanosecond pulse discharge gas-liquid discharge optical emission spectra electron density

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Spatiotemporal characteristics of nanosecond pulsed discharge in an extremely asymmetric electric field at atmospheric pressure

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Plasma Science and Technology 2017年第6期19卷 38-44页

作者： Li ZHANG dezheng yang Sen WANG Wenchun WANG Key Lab of Materials Modification (Dalian University of Technology) Ministry of Education Dalian 116024 People's Republic of China

In this paper,high resolution temporal-spatial diagnostics are employed to research the optical characteristics of nanosecond pulsed dielectric barrier discharge in needle-plate electrode ***-spatial distributions of discharge images,the emission intensities of optical emission spectra,and plasma vibrational and rotational temperatures are *** analyzing the evolution of vibrational and rotational temperatures in space and time dimensions,the energy distribution and energy transfer process in plasma are also *** is found that a diffuse structure with high density plasma concentrated in the region near the needle tip can be presented in nanosecond pulsed discharge,and an obvious energy transfer from electronic energy to vibration energy can be observed in each discharge pulse.

关键词： nanosecond pulsed discharge spatiotemporal emission spectrum reduced electric field breakdown mechanism

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Volume added surface barrier discharge plasma excited by bipolar nanosecond pulse power in atmospheric air: optical emission spectra influenced by gap distance

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Plasma Science and Technology 2018年第11期20卷 84-89页

作者： Zilu ZHAO dezheng yang Wenchun WANG Hao YUAN Li ZHANG Sen WANG Key Lab of Materials Modification Dalian University of TechnologyMinistry of EducationDalian 116024People＇s Republic of China

In this paper, volume barrier discharge with different gap distances is added on the discharge border of high-voltage electrode of annular surface barrier discharge for generating volume added surface barrier discharge （V-SBD） excited by bipolar nanosecond high-voltage pulse power in atmospheric air. The excited V-SBDs consist of surface barrier discharge （d = 0 mm） and volume added surface barrier discharges （d = 2 mm and 3 mm）. The optical emission spectra are recorded for calculating emission intensities of N2 （C3 ∏u → B3∏g） and N2＋（B2 ∑u＋ → X2 ∑g＋）, and simulating rotational and vibrational temperatures. The influences of gap distance of V-SBD on emission intensity and plasma temperature are also investigated and analyzed. The results show that d = 0 mm structure can excite the largest emission intensity of N2 （C3 ∏u → B3 ∏g）, while the existence of volume barrier discharge can delay the occurrence of the peak value of the emission intensity ratio of N2 ＋（B2 ∑u＋ → X2 ∑＋g）/N2 （C3 ∏u → B3 ∏g） during the rising period of the applied voltage pulse and weaken it during the end period. The increasing factor of emission intensity is effected by the pulse repetition rate. The d = 3 mm structure has the highest threshold voltage while it can maintain more emission intensity of N2 （C3 ∏u→ B3∏g） than that of d = 2 mm structure. The structure of d = 2 mm can maintain more increasing factor than that of the d = 3 mm structure with varying pulse repetition rate. Besides, the rotational temperatures of three V-SBD structures are slightly affected when the gap distance and pulse repetition rate vary. The vibrational temperatures have decaying tendencies of all three structures with the increasing pulse repetition rate.

关键词： surface barrier discharge (SBD) volume barrier discharge (VBD) nanosecond pulsed discharge optical emission spectra atmospheric discharge

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Comparative research of plasma-assisted milling and traditional milling in synthesizing AIN

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Plasma Science and Technology 2017年第6期19卷 33-37页

作者： Sen WANG Wenchun WANG Zhijie LIU dezheng yang Key Lab of Materials Modification by Laser Ion and Electron Beams （Dalian University of Technology） Ministry of Education Dalian 116024 People＇s Republic of China

In this paper,traditional milling and discharge plasma-assisted milling are employed to synthesize aluminum nitride（AlN） powder at nanometer scale by milling the mixture of aluminum and lithium hydroxide *** powders can be generated in traditional milling and plasma-assisted milling in an hour milling *** thermal analysis curves show that the reaction temperature of the powders treated by plasma-assisted milling is lower than that of traditional *** results indicate that plasma-assisted milling has higher efficiency in the synthesis of AlN,getting smaller crystallite size and activating ***,an optical emission spectrum is employed to demonstrate the active species in *** different formation process of AlN in the two-milling process,and the promotion effects of plasma in the milling process are discussed.

关键词： aluminum nitride nanopowder dielectric barrier discharge-assisted milling,traditional milling

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Discharge characteristics and reactive species production of unipolar and bipolar nanosecond pulsed gas–liquid discharge generated in atmospheric N2

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Plasma Science and Technology 2021年第9期23卷 123-134页

作者： 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 EducationDalian 116024People's Republic of China

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 *** 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 *** 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 *** 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 *** absorbance intensities of NO2and N2O increase with the increase of pulse peak voltage and decrease with the increase of gas flow *** 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.

关键词： nanosecond pulse discharge gas-liquid discharge optical emission spectra reactive species FTIR spectra

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Electrical characters and optical emission spectra of VBD coupled SBD excited by sine AC voltage in atmospheric air

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Plasma Science and Technology 2017年第6期19卷 45-50页

作者： Zilu ZHAO dezheng yang Wenchun WANG Hao YUAN Li ZHANG Sen WANG Key Lab of Materials Modification Dalian University of Technology Ministry of Education Dalian 116024 People＇s Republic of China

In this paper,volume coupled surface barrier discharge（V-SBD） with three structures possessing different volumes is excited by sine AC power in atmospheric *** images,waveforms of applied voltage and discharge current,and optical emission spectra simulating rotational and vibrational temperatures are recorded and *** effects of applied voltage on emission intensities of N2（C^3Πu→ B^3Πg） and N2^＋（B^2∑u^＋ → X^2Eg^＋）,and rotational and vibrational temperatures are *** results show that as applied voltage rises,emission intensities and rotational temperatures increase while vibrational temperatures *** addition it is found that,as applied voltage varies,the rotational temperature of surface discharge changes faster than that of volume discharge.

关键词： dielectric barrier discharge surface discharge volume discharge optical emission spectra

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Degradation of ciprofloxacin hydrochloride in a multiphase mixed system by subaquatic gas-liquid discharge plasma

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Plasma Science and Technology 2024年第11期26卷 144-151页

作者： Mengyu WANG Jianping LIANG Ke LU Zikai ZHOU Qinghua LIU Hao YUAN Wenchun WANG dezheng yang Key Laboratory of Materials Modification by Laser Ion and Electron BeamsMinistry of EducationDalian 116024People’s Republic of China

In recent years, antibiotic pollution has become a serious threat to human health. In this study, a gas-liquid discharge plasma is developed to degrade ciprofloxacin hydrochloride in a multiphase mixed system containing inorganic and organic impurities. The discharge characteristics are analyzed by diagnosing the applied voltage and discharge current waveforms, as well as the optical emission spectra. The work investigates how degradation efficiency is affected by applied voltage, gas flow rate, treatment time, initial concentration as well as the addition of γ-Al_(2)O_(3) pellets and peanut straw. After 70 min, the degradation efficiency of ciprofloxacin hydrochloride in the multiphase mixed system reached 99.6%. Its removal efficiency increases as the initial concentration decreases and the applied voltage increases. Besides, there is still a good degradation efficiency of ciprofloxacin hydrochloride with the addition of peanut *** degradation mechanism of ciprofloxacin hydrochloride is investigated through the analysis of degraded intermediates and reactive species.

关键词： antibiotic gas-liquid discharge multiphase mixed system ciprofloxacin hydrochloride degradation

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Hyperspectral Image Sharpening Based on Deep Convolutional Neural Network and Spatial-Spectral Spread Transform Models

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Journal of Donghua University(English Edition) 2023年第1期40卷 88-95页

作者：陆小辰刘晓慧杨德政赵萍阳云龙 College of Information Science and Technology Donghua UniversityShanghai 201620China

In order to improve the spatial resolution of hyperspectral(HS)image and minimize the spectral distortion,an HS and multispectral(MS)image fusion approach based on convolutional neural network(CNN)is *** proposed approach incorporates the linear spectral mixture model and spatial-spectral spread transform model into the learning phase of network,aiming to fully exploit the spatial-spectral information of HS and MS images,and improve the spectral fidelity of fusion *** on two real remote sensing data under different resolutions demonstrate that compared with some state-of-the-art HS and MS image fusion methods,the proposed approach achieves superior spectral fidelities and lower fusion errors.

关键词： convolutional neural network(CNN) hyperspectral image image fusion multispectral image unmixing method

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Investigation of the compact torus plasma motion in the KTX-CTI device based on circuit analyses

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Plasma Science and Technology 2022年第2期24卷 36-44页

作者： Qilong DONG Defeng KONG Xiaohe WU yang YE Kun yang Tao LAN Chen CHEN Jie WU Sen ZHANG Wenzhe MAO Zhihao ZHAO Fanwei MENG Xiaohui ZHANG Yanqing HUANG Wei BAI dezheng yang Fei WEN Pengfei ZI Lei LI Guanghai HU Shoubiao ZHANG Ge ZHUANG School of Science Shihezi UniversityShihezi 832003People's Republic of China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People's Republic of China School of Computer Science and Information Engineering Hefei University of TechnologyHefei 230009People's Republic of China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421008People's Republic of China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024People's Republic of China

Compact torus(CT)injection is one of the most promising methods for the central fuelling of next-generation reactor-grade fusion devices due to its high density,high velocity,and selfcontained magnetised structure.A newly compact torus injector(CTI)device in Keda Torus e Xperiment(KTX),named KTX-CTI,was successfully developed and tested at the University of Science and Technology in *** this study,first,we briefly introduce the basic principles and structure of KTX-CTI,and then,present an accurate circuit model that relies on nonlinear regression analysis(NRA)for studying the current waveform of the formation *** current waveform,displacement,and velocity of CT plasma in the acceleration region are calculated using this NRA-based one-dimensional point *** model results were in good agreement with the *** next-step upgrading reference scheme of the KTX-CTI device is preliminarily investigated using this NRA-based point *** research can provide insights for the development of experiments and future upgrades of the device.

关键词： compact torus(CT) circuit modelling nonlinear regression analysis(NRA) point model

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