Study On The Application Of Adsorption And Catalytic Degradation Of Ethyl Acetate Using Low Temperature Plasma Technology-fixed Bed

With the rapid development of China's industrialization,the consumption of resources and energy are increasing day by day,accompanied by the air pollution problem is increasingly serious,volatile organic compounds belong to one of the air pollutants,which is another challenge for the government after desulfurization and denitration.In this paper,a self-made coil dielectric barrier reactor was used as a low-temperature plasma generator to investigate the degradation of ethyl acetate under the conditions of discharge voltage,intake flow,simulated exhaust gas concentration,reaction tube size and relative humidity.At the same time,Ag/g-C₃N₄/modified manganese ore ternary composite was prepared and characterized by BET,UV-Vis,XPS,TEM and other means to explore the dielectric barrier discharge.The dielectric barrier discharge generated low-temperature plasma combined with catalyst to degrade ethyl acetate was investigated and the degradation tail gas was analyzed.The conclusions are as follows:?1?A single coil dielectric barrier reactor was used to treat ethyl acetate.The results showed that in the air background,the degradation efficiency of ethyl acetate increased with the increase of discharge voltage,decreased with the increase of air flow rate and simulated exhaust gas concentration,and increased first and then decreased with the increase of relative humidity.The degradation rate of ethyl acetate was 50.1%when the voltage was 10000V,the flow rate was 0.3m³/h,the concentration of simulated ethyl acetate waste gas was about 500mg/m³,the size of reaction tube was fixed and the relative humidity was about 64%.?2?The Ag/g-C₃N₄photocatalyst prepared by oxidation-reduction method,Ag/g-C₃N₄photocatalyst prepared by photoreduction deposition method and Ag/g-C₃N₄photocatalyst prepared by ultrasonic calcination method were studied.Using UV-Vis,TEM and other characterization methods and experimental test,it was shown that the electron capture trap formed on the surface of g-C₃N₄by Ag loading can form on the surface of the electron capture trap can reduce photoproduction compound probability of electrons and holes,thus improve the photocatalytic performance of three types of Ag/g-C₃N₄were showed good catalytic performance.At the same time,the manganese ore modified by dilute nitric acid was investigated,and the degradation of ethyl acetate was carried out by plasma technology.The results of BET,TEM and other characterization showed that the modified manganese ore improved the degradation efficiency to a certain extent.Finally using modified manganese ore as the carrier,the Ag/g-C₃N₄was loaded on the surface,through the characterization methods such as XRD,TEM in combination with the experimental results,comparison,found that the effect of 2%Ag/g-C₃N₄/modified manganese ore?1:5 ratio?combined with plasma technology on the degradation of ethyl acetate was the most obvious.Respectively,the effect of 2%Ag/g-C₃N₄/modified manganese ore?1:5 ratio?increased from 5k V to 10k V,and the degradation efficiency was 50.8%,61.4%,70.6%,82.3%,90.8%and 92.3%which was 26.2%,33.1%,31.9%,38.8%,41.6%and 42.2%higher than that of the empty tower experiment.?3?The final degradation products of ethyl acetate were analyzed by Fourier transform infrared spectrometer and Fuli gas chromatograph.The main products of ethyl acetate degradation were CO,CO₂,O₃,NO₂and a small amount of ethyl acetate,acetic acid and other by-products.At the same time,the content of O₃,NOx,CO₂were determined.The experimental results show that the catalyst filling can improve the mineralization rate of ethyl acetate and reduce the ozone content,which indicates that the catalyst filling can improve the degradation efficiency of ethyl acetate and reduce the secondary pollution.?4?The tail gas adsorption device was set up at the end of the reactor to explore the adsorption and degradation effects of three adsorbents on the tail gas after discharge reaction.By comparing the adsorption experiment with the dielectric barrier discharge-catalytic reaction experiment,it can be concluded that the adsorption experiment has adsorption effect on the tail gas after the reaction.