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论文类型：期刊论文

发表时间：2019-07-01

发表刊物：PLASMA SCIENCE & TECHNOLOGY

收录刊物：SCIE

卷号：21

期号：7

ISSN号：1009-0630

关键字：dielectric barrier discharge; gas-liquid hybrid discharge; benzene degradation; reactive species; nitrogen dioxide

摘要：A double-chamber gas-liquid phase DBD reactor (GLDR), consisting of a gas-phase discharge chamber and a gas-liquid discharge chamber in series, was designed to enhance the degradation of benzene and the emission of NQ. The performance of the GLDR on discharge characteristics, reactive species production and benzene degradation was compared to that of the single-chamber gas phase DBD reactor (GPDR). The effects of discharge gap, applied voltage, initial benzene concentration, gas flow rate and solution conductivity on the degradation and energy yield of benzene in the GLDR were investigated. The GLDR presents a higher discharge power, higher benzene degradation and higher energy yield than that of the GPDR. NO2 emission was remarkably inhibited in the GLDR, possibly due to the dissolution of NO2 in water. The benzene degradation efficiency increased with the applied voltage, but decreased with the initial concentration, gas flow rate, and gas discharge gap, while the solution conductivity presented less influence on benzene degradation. The benzene degradation efficiency and the energy yield reached 61.11% and 1.45 g kWh(-1) at 4 mm total gas discharge gap, 15 kV applied voltage, 200 ppm benzene concentration, 0.2 L min(-1) gas flow rate and 721 mu S cm(-1) water conductivity. The intermediates and byproducts during benzene degradation were detected by FT-IR, GC-MS and LC-MS primarily, and phenols, COx and other aromatic substitutes, O-3, NQ(x) etc, were determined as the main intermediates. According to these detected byproducts, a possible benzene degradation mechanism was proposed.