电化学与臭氧联用技术降解水中DEP

发布时间：2018-05-26 03:28

  本文选题：高级氧化 + 环境内分泌干扰物　； 参考：《上海应用技术大学》2016年硕士论文

【摘要】：邻苯二甲酸酯(phthalic acid esters,PAEs)作为一类环境内分泌干扰物,其水环境污染问题一直备受人们关注。本论文选择邻苯二甲酸二乙酯(DEP)为模型PAEs,采用电化学与臭氧联用技术降解矿化DEP,研究其中降解动力学过程及机理。实验主要在自制电化学反应器中进行,由臭氧发生器产生的氧气和臭氧的气体混合物持续鼓入反应液。实验中阳极均为铂(Pt)电极,阴极则分别采用碳毡电极(carbon felt)、网状玻碳电极(RVC)、自制的碳-聚四氟乙烯(carbon-PTFE)电极,研究了三种不同阴极材料对电化学与臭氧联用技术降解矿化DEP过程的影响,分析了三种不同阴极材料在降解DEP体系中的寿命稳定性,实验结果表明三种不同阴极材料均可以有效地将反应体系中的氧气在阴极转化成过氧化氢,这种原位产生的过氧化氢可与反应体系中的臭氧发生反应,产生具有强氧化活性的羟基自由基(·OH),可有效降解矿化DEP。与其他两种阴极材料相比,采用自制的carbon-PTFE电极的体系,DEP的降解矿化效果最好,反应1小时后总有机碳(TOC)的去除率达91.8%；通过实验研究还发现,自制carbon-PTFE电极呈现出非常好的寿命稳定性。总体来看,自制carbon-PTFE电极在电化学与臭氧联用技术处理邻苯二甲酸酯(PAEs)类废水的应用中具有很好的电化学活性和稳定性。本论文还利用高效液相色谱等大型仪器分析测试手段对DEP降解过程中的中间产物进行了定性及定量分析,进而深入分析了电化学与臭氧联用技术降解矿化DEP的可能机理。本论文的研究结果可为电化学与臭氧联用技术处理水环境邻苯二甲酸酯类污染物提供重要的理论和技术参考。
[Abstract]:As a class of environmental endocrine disruptors, phthalic acid estersof phthalic acid (PAEs) has attracted much attention for its water pollution. In this paper, DEP (diethyl phthalate) was selected as the model, and the degradation kinetics and mechanism of DEP were studied by electrochemical and ozonation techniques. The experiment was carried out in a self-made electrochemical reactor. The mixture of oxygen and ozone produced by the ozone generator was continuously pumped into the reaction solution. In the experiment, the anodes were all platinum-carbon (Pt) electrodes, the cathodes were carbon felt electrodes (carbon feltines) and reticular glassy carbon electrodes (RVC-), carbon-PTFEs (carbon-PTFEs) electrodes were prepared by ourselves. The effects of three kinds of cathode materials on the degradation of mineralized DEP by electrochemical and ozone combined technology were studied. The lifetime stability of three different cathode materials in DEP degradation system was analyzed. The experimental results show that all three kinds of cathode materials can effectively convert oxygen in the reaction system into hydrogen peroxide at the cathode, and the hydrogen peroxide produced in situ can react with ozone in the reaction system. Hydroxyl radical (OHN) with strong oxidizing activity can effectively degrade mineralized DEP. Compared with the other two kinds of cathode materials, the system using self-made carbon-PTFE electrode has the best degradation and mineralization effect, and the removal rate of total organic carbon (TOC) is 91.8% after 1 hour reaction. The self-made carbon-PTFE electrode shows very good life stability. In general, the self-made carbon-PTFE electrode has good electrochemical activity and stability in the treatment of phthalate (PAEs) wastewater by the combined use of ozone and electrochemical technology. In this paper, the intermediate products in the degradation of DEP were qualitatively and quantitatively analyzed by means of high performance liquid chromatography (HPLC) and other large-scale instruments, and the possible mechanism of degradation of mineralized DEP by the combination of electrochemical and ozone techniques was analyzed. The results of this paper can provide an important theoretical and technical reference for the treatment of phthalic acid esters in water environment by the combination of electrochemical and ozone technologies.
【学位授予单位】：上海应用技术大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703;O657.1
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本文编号：1935771