介质阻挡放电协同Bi2WO6/天然赤铁矿降解乙酸乙酯

为强化DBD（介质阻挡放电）技术对VOCs（挥发性有机物）的处理效果，采用溶胶凝胶法制备Bi₂WO₆/NH（NH为天然赤铁矿）复合催化剂，并利用DBD协同催化剂降解EA（ethyl acetate，乙酸乙酯）.采用XRD（X射线衍射）仪、BET（比表面积及孔径）分析仪、SEM（扫描电子显微镜）分析仪对催化剂进行表征，对比分析DBD、DBD/Bi₂WO₆（DBD协同Bi₂WO₆）、DBD/NH（DBD协同NH）及DBD/Bi₂WO₆/NH（DBD协同Bi₂WO₆/NH复合催化剂）4个体系中EA去除率和能量产率随输入功率、初始ρ（EA）及气体停留时间的变化情况，同时探究输入功率和催化剂对ρ（O₃）及矿化率的影响，并对降解产物进行分析.结果表明:①在不同工艺参数条件下，EA去除率和能量产率均表现为DBD/Bi₂WO₆/NH体系> DBD/NH体系> DBD/Bi₂WO₆体系> DBD体系.②EA去除率随输入功率的升高和气体停留时间的延长而增加，随初始ρ（EA）的升高而降低；但能量产率随输入功率的升高和气体停留时间的延长而降低，随初始ρ（EA）的升高而增加.③在输入功率为84 W、初始ρ（EA）为0.40 mg/L、气体流量为1.0 m3/h的条件下，相较于DBD体系，DBD/Bi₂WO₆/NH体系中EA去除率和矿化率分别提高了19.16%和14.44%，而ρ（O₃）降低了74.47%.④DBD降解EA的最终产物主要为CO₂、H₂O及微量的CH₄、CH₃CH₂OH及CH₃COOH等小分子有机化合物.研究显示，DBD协同Bi₂WO₆/NH复合催化剂能够高效去除EA. 

Degradation of Ethyl Acetate by Dielectric Barrier Discharge Combined with Bi2WO6/Natural Hematite

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.