Dielectric barrier discharge（DBD） is utilized to decompose xylene vapor in mobile gas under normal atmospheric pressure.The plasma is generated by an AC power source with a frequency of 6 kHz.In the experiment,the d...Dielectric barrier discharge（DBD） is utilized to decompose xylene vapor in mobile gas under normal atmospheric pressure.The plasma is generated by an AC power source with a frequency of 6 kHz.In the experiment,the discharge power on the DBD reactor was calculated by a Lissajous figure,and the specific input energy（SIE） of different discharge voltage or residence time was obtained.The concentrations of xylene,carbon monoxide and carbon dioxide in the gas were analyzed by gas chromatography.The spectra of DBD were diagnosed using a spectrometer.We calculated the conversion rate（CR）,mineralization rate（MR） and carbon dioxide selectivity.The relationship between these quantities and the SIE was analyzed.The experimental results show that high concentration xylene can be decomposed mostly by DBD plasma.The CR can reach as high as 90%with the main product of carbon dioxide.展开更多
The wastewater produced by the large-scale usage of antibiotics worldwide was more harmful to the ecological environment and human health.In the research,the coupling technology of‘adsorption-plasma regeneration'...The wastewater produced by the large-scale usage of antibiotics worldwide was more harmful to the ecological environment and human health.In the research,the coupling technology of‘adsorption-plasma regeneration'was taken to treat tetracycline in aqueous solution.The pollutants were adsorbed by the resins firstly and then regenerated ectopically by dielectric barrier discharge plasma.The discharge parameters,such as discharge voltage and frequency were researched to achieve the optimal regeneration efficiency and energy efficiency.Meanwhile,the analyses of the surface functional groups and microstructure were also investigated.After the five‘adsorption-regeneration'processes,the results showed that the optimal discharge parameters of voltage and frequency were 20 k V and 1 k Hz,respectively.The regeneration efficiency and energy efficiency were above 80%and 115 g k W^(-1)·h^(-1),respectively.The tetracycline adsorption by virgin resin and regenerated resin nearly followed pseudo-second order kinetics,and there was no fatal damage to the surface characteristics and physicochemical properties of the resins through the multiple plasma regeneration processes.Finally,according to the intra-particle diffusion model and the degradation products detected by GC-MS,the adsorption and degradation mechanisms of tetracycline were deduced.展开更多
A dielectric barrier discharge（DBD） reactor is introduced to generate H2O2 by non-thermal plasma with a mixture of oxygen and water mist produced by an ultrasonic atomizer.The results of our experiment show that the...A dielectric barrier discharge（DBD） reactor is introduced to generate H2O2 by non-thermal plasma with a mixture of oxygen and water mist produced by an ultrasonic atomizer.The results of our experiment show that the energy yield and concentration of the generated H2O2 in the pulsed discharge are much higher than that in AC discharge,due to its high energy efficiency and low heating effect.Micron-sized liquid droplets produced by an ultrasonic atomizer in water mist have large specific surface area,which greatly reduces mass transfer resistance between hydroxyl radicals and water liquids,leading to higher energy yield and H2O2 concentration than in our previous research.The influence of applied voltage,discharge frequency,and environmental temperature on the generated H2O2 is discussed in detail from the viewpoint of the DBD mechanism.The H2O2 concentration of 30 mg l^-1,with the energy yield of 2 gkW^-1h^-1 is obtained by pulsed discharge in our research.展开更多
文摘Dielectric barrier discharge（DBD） is utilized to decompose xylene vapor in mobile gas under normal atmospheric pressure.The plasma is generated by an AC power source with a frequency of 6 kHz.In the experiment,the discharge power on the DBD reactor was calculated by a Lissajous figure,and the specific input energy（SIE） of different discharge voltage or residence time was obtained.The concentrations of xylene,carbon monoxide and carbon dioxide in the gas were analyzed by gas chromatography.The spectra of DBD were diagnosed using a spectrometer.We calculated the conversion rate（CR）,mineralization rate（MR） and carbon dioxide selectivity.The relationship between these quantities and the SIE was analyzed.The experimental results show that high concentration xylene can be decomposed mostly by DBD plasma.The CR can reach as high as 90%with the main product of carbon dioxide.
基金financed by National Natural Science Foundation of China (No. 51877046)
文摘The wastewater produced by the large-scale usage of antibiotics worldwide was more harmful to the ecological environment and human health.In the research,the coupling technology of‘adsorption-plasma regeneration'was taken to treat tetracycline in aqueous solution.The pollutants were adsorbed by the resins firstly and then regenerated ectopically by dielectric barrier discharge plasma.The discharge parameters,such as discharge voltage and frequency were researched to achieve the optimal regeneration efficiency and energy efficiency.Meanwhile,the analyses of the surface functional groups and microstructure were also investigated.After the five‘adsorption-regeneration'processes,the results showed that the optimal discharge parameters of voltage and frequency were 20 k V and 1 k Hz,respectively.The regeneration efficiency and energy efficiency were above 80%and 115 g k W^(-1)·h^(-1),respectively.The tetracycline adsorption by virgin resin and regenerated resin nearly followed pseudo-second order kinetics,and there was no fatal damage to the surface characteristics and physicochemical properties of the resins through the multiple plasma regeneration processes.Finally,according to the intra-particle diffusion model and the degradation products detected by GC-MS,the adsorption and degradation mechanisms of tetracycline were deduced.
文摘A dielectric barrier discharge（DBD） reactor is introduced to generate H2O2 by non-thermal plasma with a mixture of oxygen and water mist produced by an ultrasonic atomizer.The results of our experiment show that the energy yield and concentration of the generated H2O2 in the pulsed discharge are much higher than that in AC discharge,due to its high energy efficiency and low heating effect.Micron-sized liquid droplets produced by an ultrasonic atomizer in water mist have large specific surface area,which greatly reduces mass transfer resistance between hydroxyl radicals and water liquids,leading to higher energy yield and H2O2 concentration than in our previous research.The influence of applied voltage,discharge frequency,and environmental temperature on the generated H2O2 is discussed in detail from the viewpoint of the DBD mechanism.The H2O2 concentration of 30 mg l^-1,with the energy yield of 2 gkW^-1h^-1 is obtained by pulsed discharge in our research.
