| 介质阻挡放电等离子体去除水中敌草隆的降解机理 |
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| 引用本文： | 朱 丹,陈 培,江 林,刘润龙,郎 林,袁守军,冯景伟.介质阻挡放电等离子体去除水中敌草隆的降解机理[J].环境科学研究,2014,27(11):1360-1366. |
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| 作者姓名： | 朱 丹 陈 培 江 林 刘润龙 郎 林 袁守军 冯景伟 |
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| 作者单位： | 合肥工业大学土木与水利工程学院, 安徽 合肥 230009 |
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| 基金项目： | 国家自然科学基金项目(51208163,9)；河海大学水文水资源与水利工程科学国家重点实验室开放课题(2013491211)；南京大学污染控制与资源化研究国家重点实验室开放课题项目(PCRRF11014) |
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| 摘 要： | 研究了线筒式介质阻挡放电等离子体对水中敌草隆的降解效果,考察了不同因素对敌草隆去除效果的影响及其对敌草隆的降解机理. 结果表明:输入功率、空气流量均对敌草隆的降解产生较大影响. 输入功率为50 W、空气流量为140 L/h时,放电反应6 min敌草隆的去除率达到95.7%. 随着放电时间的增加,水溶液中测出的ρ(O3)、ρ(H2O2)均明显升高,6 min后其产量分别为11.9和1.2 mg/L；放电6 min后pH从最初的6.3降至3.4,ρ(TOC)也从最初的14.2 mg/L降至11.9 mg/L. 采用离子色谱仪分析敌草隆降解过程中产生的离子发现,反应过程中ρ(Cl-)和ρ(NO3-)呈线性增长. 采用发光细菌抑制率反映溶液毒性,放电6 min后,敌草隆溶液对发光细菌的抑制率高达90.5%,溶液毒性增大. 通过液相色谱-飞行时间质谱对敌草隆降解产物进行分析,敌草隆降解过程中中间产物的形成存在烷基氧化、脱氯羟化、脱氯羟化-烷基氧化3种途径.
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| 关 键 词： | 敌草隆 介质阻挡放电 降解机理 |
| 收稿时间： | 2013/12/4 0:00:00 |
| 修稿时间： | 2014/4/25 0:00:00 |
Removal Mechanism of Aqueous Diuron by Dielectric Barrier Discharge Plasma |
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| ZHU Dan,CHEN Pei,JIANG Lin,LIU Run-long,LANG Lin,YUAN Shou-jun and FENG Jing-wei.Removal Mechanism of Aqueous Diuron by Dielectric Barrier Discharge Plasma[J].Research of Environmental Sciences,2014,27(11):1360-1366. |
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| Authors: | ZHU Dan CHEN Pei JIANG Lin LIU Run-long LANG Lin YUAN Shou-jun and FENG Jing-wei |
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| Affiliation: | School of Civil Engineering, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | To solve the problems of water environment pollution caused by diuron, the degradation effect of diuron by dielectric barrier discharge plasma was studied. The wire-cylinder dielectric barrier discharge reactor was adopted for aqueous diuron removal. The effect of different parameters on the diuron degradation, and the degradation mechanism of diuron were detected. The results showed that the input power and airflow were the important parameters for the degradation of diuron. When discharge power was 50 W and the air flow was 140 L/h, the degradation rate of diuron was 95.7% with 6 min discharge time. The concentration of O3 and H2O2 increased with increasing discharge time. The pH decreased from 6.3 to 3.4, and the concentrations of TOC decreased from 14.2 mg/L to 11.9 mg/L. The concentrations of Cl-and NO3- were determined by ion chromatograph, which increased significantly with increasing discharge time during diuron degradation process. The change of acute toxic was representative by the inhibition rate of Photobacterium during diuron degradation process. After 6 mininues, the inhibition rate of Photobacterium was 90.5%, and the increasing toxicity trend was observed for the treated diuron solution. Diuron degradation byproducts were confirmed by liquid chromatography-time-of-flight mass spectrometry, the degradation intermediates of diuron were formed mainly by dechlorination hydroxyl, alkyl oxidation reaction and dechlorination hydroxyl combined with alkyl oxidation reaction. |
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| Keywords: | diuron dielectric barrier discharge degradation mechanism |
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