三维粒子电极电催化氧化非那西丁的研究

发布时间：2019-03-05 13:32

【摘要】：三维电极法是近年来新兴的水处理技术,其具有处理效率高、能耗低、能够彻底降解污染物、无二次污染等优点,是目前研究的热点之一。但是三维电极反应器降解有机物过程复杂,所以其降解机理至今还未有定论。近年来,国内外持续关注药品和个人护理用品(PPCPs)对环境的污染。非那西丁就是PPCPs中的一种典型污染物,其具有危害性大、毒性强、很难被一般微生物所降解等特点。论文采用三维电极反应器对非那西丁模拟废水进行电化学氧化实验研究。实验采用石墨电极作为阴极和阳极,自制A/B粒子作为第三维粒子电极,对模拟非那西丁废水进行了处理。实验揭示其电化学氧化机理,发现非那西丁降解的中间产物并推导其降解过程,探索三维电极反应器降解非那西丁的最佳工艺条件。研究了三维电极对有机物的降解机理。其降解机理是通过直接电化学氧化和间接电化学氧化共同作用下对有机物进行降解,直接电化学氧化主要能够去除非那西丁分子上的支链,间接电化学氧化产生的羟基自由基能够打开苯环,从而彻底矿化有机物。氧气的加入可以使电化学氧化效率提高。借助液相色谱-质谱联用仪定性分析三维电极降解非那西丁的9种中间产物,推测非那西丁电催化氧化可能的两条降解途径。采用三维电极反应器处理模拟非那西丁废水,研究了电流密度、废水初始PH值、曝气量对COD去除率的影响。在最佳参数条件下,即电流密度为10mA/cm2,废水初始PH为5,曝气量为0.2m3/h时废水电化学氧化4h,COD去除率可达到73.4%。
[Abstract]:The three-dimensional electrode method is an emerging water treatment technology in recent years, which has the advantages of high treatment efficiency, low energy consumption, complete degradation of pollutants, no secondary pollution and the like, and is one of the hot spots at present. However, the degradation mechanism of the three-dimensional electrode reactor has not been decided yet. In recent years, the environmental pollution of drug and personal care products (PPCPs) has been continuously concerned at home and abroad. The non-phenacetin is a typical pollutant in PPCPs, which has the characteristics of large harm, strong toxicity, and being difficult to be degraded by the general microorganisms. In this paper, a three-dimensional electrode reactor was used to study the electrochemical oxidation of the non-Nasiddin simulated wastewater. In the experiment, the graphite electrode was used as the cathode and the anode, and the self-made A/ B particles were used as the third-dimensional particle electrode. In this paper, the electrochemical oxidation mechanism was revealed, and the degradation process was derived and the optimum process conditions for the degradation of the non-siddin by the three-dimensional electrode reactor were investigated. The degradation mechanism of the three-dimensional electrode on the organic matter was studied. The degradation mechanism is that the organic matter is degraded under the action of direct electrochemical oxidation and indirect electrochemical oxidation, the direct electrochemical oxidation is mainly capable of removing the branched chain on the non-cidin molecule, and the hydroxyl radical generated by the indirect electrochemical oxidation can open the benzene ring, So as to completely mineralize the organic matter. The addition of oxygen can improve the electrochemical oxidation efficiency. The three-dimensional electrode was used to analyze the nine intermediate products of the non-phenacetin by means of the liquid chromatography-mass spectrometry (LC-MS), and the two degradation pathways of the non-siddin electrocatalytic oxidation were estimated. The effect of the current density, the initial pH of the waste water and the amount of aeration on the removal rate of COD was studied by the three-dimensional electrode reactor. Under the optimum parameters, the current density is 10 mA/ cm2, the initial PH of the waste water is 5, the aeration amount is 0.2m3/ h, the COD removal rate can reach 73.4%.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703

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