School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
J Hazard Mater. 2020 Dec 5;400:123259. doi: 10.1016/j.jhazmat.2020.123259. Epub 2020 Jun 21.
A double dielectric barrier discharge (DDBD) reactor was established to decompose toluene with high energy efficiency. Differences in discharge characteristics including visual images, voltage-current waveforms, Lissajous figures, and temperature variation, were determined between the DDBD and SDBD reactors. Removal efficiency, mineralization rate, CO selectivity, and energy yield were used to evaluate the toluene abatement performance of the two reactors. Compared to the SDBD reactor, the DDBD reactor exhibited more uniform and stable discharges due to a change in discharge mode. In addition, the DDBD reactor's dissipated power and reactor temperature (including the gas, barrier and ground electrode) were significantly lower than those in the SDBD reactor. At 22-24 kV, the DDBD reactor showed a higher toluene removal efficiency and mineralization rate, while at 14-16 kV, the SDBD reactor exhibited higher respective value. The energy efficiency of the DDBD was 2.5-3 times that of the SDBD reactor, and the overall energy constant k of the DDBD reactor (1.47 mL/J) was significantly higher than that of the SDBD reactor (0.367 mL/J) as revealed by the kinetics study. Lastly, a plausible toluene degradation mechanism in the DDBD and SDBD reactors was proposed based on organic intermediates that formed during toluene decomposition.
建立了双介质阻挡放电（DDBD）反应器，以高能效分解甲苯。研究了 DDBD 和 SDBD 两种反应器在放电特性方面的差异，包括视觉图像、电压-电流波形、李萨如图和温度变化。采用去除效率、矿化率、CO 选择性和能量产率来评估两种反应器对甲苯的去除性能。与 SDBD 反应器相比，DDBD 反应器由于放电模式的改变而呈现出更均匀和稳定的放电。此外，DDBD 反应器的耗散功率和反应器温度（包括气体、阻挡和接地电极）明显低于 SDBD 反应器。在 22-24 kV 时，DDBD 反应器表现出更高的甲苯去除效率和矿化率，而在 14-16 kV 时，SDBD 反应器则表现出更高的相应值。DDBD 反应器的能量效率是 SDBD 反应器的 2.5-3 倍，动力学研究表明，DDBD 反应器的总能量常数 k（1.47 mL/J）明显高于 SDBD 反应器（0.367 mL/J）。最后，根据甲苯分解过程中形成的有机中间体，提出了 DDBD 和 SDBD 两种反应器中甲苯降解的可能机制。
