线筒式介质阻挡放电诱导降解水中莠去津
Wire-cylinder dielectric barrier discharge induced degradation of aqueous atrazine.
作者信息
Zhu Dan, Jiang Lin, Liu Run-Long, Chen Pei, Lang Lin, Feng Jing-Wei, Yuan Shou-Jun, Zhao Da-Yong
机构信息
School of Civil Engineering, Hefei University of Technology, Hefei 230009, China.
School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China.
出版信息
Chemosphere. 2014 Dec;117:506-14. doi: 10.1016/j.chemosphere.2014.09.031. Epub 2014 Sep 29.
The wire-cylinder dielectric barrier discharge reactor was adopted for removal of aqueous atrazine. The effect of different parameters on the degradation efficiency of atrazine was investigated, and the degradation mechanism of atrazine was studied. The experimental results showed that when the discharge power was 50 W and the air flow rate was 140 L h(-1), 93.7% of atrazine was degraded after 18 min of discharge time. The concentrations of generated O3 and H2O2 increased with increasing discharge time. The pH decreased from 6.80 to 2.50, 12.7% of TOC was removed after 18 min. The concentrations of generated Cl(-) and NO3(-) increased significantly during the degradation process of atrazine, and the decreasing toxicity trend was observed for the treated atrazine solution. The degradation byproducts of atrazine were identified using liquid chromatography-time-of-flight mass spectrometry (LC-TOF-MS), which might be formed mainly in dechlorination hydroxylation, alkyl oxidation, dechlorination hydroxylation combined with alkyl oxidation and demethylation oxidation reactions.
采用线筒式介质阻挡放电反应器去除水中的阿特拉津。研究了不同参数对阿特拉津降解效率的影响，并探讨了阿特拉津的降解机理。实验结果表明，当放电功率为50 W、空气流量为140 L h(-1)时，放电18 min后阿特拉津的降解率达到93.7%。生成的O3和H2O2浓度随放电时间的增加而升高。pH值从6.80降至2.50，18 min后TOC去除率为12.7%。在阿特拉津降解过程中，生成的Cl(-)和NO3(-)浓度显著增加，处理后的阿特拉津溶液毒性呈下降趋势。利用液相色谱-飞行时间质谱(LC-TOF-MS)对阿特拉津的降解产物进行了鉴定，其可能主要通过脱氯羟基化、烷基氧化、脱氯羟基化与烷基氧化结合以及脱甲基氧化反应形成。
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