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Evaluation on a double-chamber gas-liquid phase discharge reactor for benzene degradation
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作者 Kefeng SHANG Qi ZHANG +3 位作者 Na LU Nan JIANG Jie LI Yan WU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第7期135-144,共10页
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 NOx... 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 NOx. 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 k Wh-1 at 4 mm total gas discharge gap, 15 k V applied voltage, 200 ppm benzene concentration,0.2 L min-1 gas flow rate and 721 μS 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, O3, NOx, etc, were determined as the main intermediates.According to these detected byproducts, a possible benzene degradation mechanism was proposed. 展开更多
关键词 dielectric BARRIER discharge gas-liquid hybrid discharge BENZENE degradation reactive species nitrogen dioxide
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气液混合放电对水中阿特拉津的降解 被引量:5
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作者 冯景伟 郑正 +4 位作者 罗兴章 聂耳 赵国华 高顺枝 黄星发 《环境化学》 CAS CSCD 北大核心 2008年第6期707-711,共5页
采用气液混合放电降解水溶液中的阿特拉津,考察了放电输出功率、溶液pH值和Fe2+浓度对阿特拉津降解的影响,并初步探讨了其降解动力学.结果表明,提高放电输出功率、降低溶液pH值均能提高阿特拉津的降解率.相同实验条件下,添加Fe2+显著提... 采用气液混合放电降解水溶液中的阿特拉津,考察了放电输出功率、溶液pH值和Fe2+浓度对阿特拉津降解的影响,并初步探讨了其降解动力学.结果表明,提高放电输出功率、降低溶液pH值均能提高阿特拉津的降解率.相同实验条件下,添加Fe2+显著提高了阿特拉津的降解率,在Fe2+添加量分别为0.2,0.6,2.0mmol·l-1时,随着Fe2+浓度的升高阿特拉津的降解率也不断提高.阿特拉津在气液混合放电反应器中的降解符合一级反应动力学.阿特拉津降解过程中的中间产物主要通过以下4种途径产生∶脱烷基作用、烷基氧化作用、脱氯羟化作用和脱氯羟化-氧化作用. 展开更多
关键词 阿特拉津 气液混合放电 降解
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