多孔钛基体二氧化铅管式膜电极的制备及应用

发布时间：2018-01-13 10:37

本文关键词：多孔钛基体二氧化铅管式膜电极的制备及应用　出处：《南京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文发明了一种新的电沉积方法——充气式电沉积法,克服了传统电沉积法无法在多孔基体上电沉积氧化层膜的难题,成功在多孔钛管外表面上沉积了一层分布均匀孔洞的二氧化铅薄层。所制备的多孔钛基体二氧化铅管式膜电极将膜过滤与电化学氧化有效的结合在一起,具备比传统二氧化铅电极更好的电化学性能和更长使用寿命。实验以多孔钛管为阳极,不锈钢圈为阴极,在持续充气的条件下恒温电沉积80min后制得二氧化铅管式膜电极。通过孔径分析以及扫描电镜可以观察到电极的平均孔径为2-3μm,通过循环伏安曲线分析以及加速寿命实验得知电极的析氧电位为1.6V,加速使用寿命为43小时。实验以乙酰甲胺磷配制的溶液为模拟废水进行电化学氧化降解实验,实验在相同条件下分别与光催化法降解和传统二氧化铅电极静态降解进行对比实验。发现相比光催化法光照120min后降解率为84%,膜电极所进行的电化学氧化实验在30min内对乙酰甲胺磷的降解率达到100%,具有更高效的降解效果；同时,膜电极的过滤电解在对乙酰甲胺磷的降解过程中也表现出比传统电极的静态电解更好的降解效果。实验还通过对乙酰甲胺磷废水初始浓度、Na2SO4浓度、pH值和电流密度等一系列操作参数的调节,进行了不同参数对降解效果影响的实验。发现在对乙酰甲胺磷废水降解的实验中,乙酰甲胺磷的初始浓度越高,对它的降解率就越低：溶液pH值越高,降解效果越好；电解质浓度在5g/L时达到最佳点；电流密度越高,降解率越高,到达一定程度时,电流密度对降解率影响变小。
[Abstract]:In this paper, a new electrodeposition method, aerated electrodeposition method, has been developed, which overcomes the problem that the traditional electrodeposition method cannot be used to electrodeposit oxide films on porous substrates. A thin layer of lead dioxide with uniform pore distribution was deposited on the surface of porous titanium tube successfully. The porous titanium matrix lead dioxide tubular membrane electrode effectively combined membrane filtration with electrochemical oxidation. It has better electrochemical performance and longer service life than traditional lead dioxide electrode. Porous titanium tube is used as anode and stainless steel ring as cathode. The lead dioxide tubular membrane electrode was prepared after 80 min of constant temperature electrodeposition under the condition of continuous aeration. The average pore size of the electrode was 2-3 渭 m by pore size analysis and scanning electron microscope. The results of cyclic voltammetry and accelerated life test show that the oxygen evolution potential of the electrode is 1.6 V. The accelerated service life was 43 hours. The electrochemical oxidation degradation experiment was carried out with the solution prepared by acephate as the simulated wastewater. Under the same conditions, the experimental results were compared with photocatalytic degradation and static degradation of traditional lead dioxide electrode. It was found that the degradation rate of the photocatalytic method was 84% after 120 minutes of illumination. The degradation rate of acephate reached 100% in 30 min by the electrochemical oxidation experiment at the membrane electrode, which showed more efficient degradation effect. At the same time, the filtration electrolysis of membrane electrode also showed better degradation effect than static electrolysis of traditional electrode in the degradation of acephate. The experiment also through the initial concentration of acephate wastewater. A series of operation parameters such as pH value and current density of Na2SO4 were adjusted, and the effects of different parameters on the degradation of acephate wastewater were studied. The higher the initial concentration of acephate, the lower the degradation rate: the higher the pH value of the solution, the better the degradation effect; The electrolyte concentration reached the best point at 5 g / L; The higher the current density, the higher the degradation rate. When the current density reaches a certain degree, the effect of current density on the degradation rate becomes smaller.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O646.54;X703

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