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摘要
In order to optimize the treatment of volatile organic compounds (VOCs) by dielectric barrier discharge (DBD) technique, a DBD reactor combined with catalysts was usedto remove EA (ethyl acetate). The Bi2WO6/NH composite was prepared by a sol-gel method and characterized by X-ray diffraction (XRD), specific surface area and pore size analyzer (BET) and scanning electron microscope (SEM). The EA removal efficiency and energy yield in DBD, DBD/Bi2WO6 (DBD combined with Bi2WO6), DBD/NH (DBD combined with NH) and DBD/Bi2WO6/NH (DBD combined with Bi2WO6/NH composite) systems were analyzed contrastively by function of input power, initial ρ(EA) and gas residence time. The effects of catalysts on the removal of ozone and mineralization rate in the plasma-catalytic oxidation process were investigated as a function of input power and the degradation products were also analyzed. The results showed that: (1) Both EA removal efficiency and energy yield of different processes followed the order: DBD/Bi2WO6/NH > DBD/NH > DBD/Bi2WO6 > DBD. (2) The EA removal efficiency increased with the increase of input power and gas residence time, and decreased with the increase of initial ρ(EA). However the energy yield decreased with the increase of input power and gas residence time, and increased with the increase of initial ρ(EA). (3) Compared with bare DBD system, when the input power was 84 W, initial ρ(EA) was 0.40 mg/L and gas flow rate was 1.0 m3/h, the removal efficiency and mineralization rate of EA in DBD/Bi2WO6/NH system increased by 19.16% and 14.44%, respectively, and the ρ(O3) reduced by 74.47%. (4) The final products of EA degraded by DBD were mainly CO2, H2O and a trace amount of some small organic compounds, such as CH4, CH3CH2OH and CH3COOH. The study showed that DBD combined with Bi2WO6/NH composite could effectively remove of EA. ? 2020, Editorial Board, Research of Environmental Sciences. All right reserved.
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