电催化氧化降解苯系废水的研究

发布时间：2018-06-20 19:48

  本文选题：电催化氧化 + Ti/Sn　； 参考：《西南科技大学》2015年硕士论文

【摘要】：高毒性、难降解的苯系废水会对环境和人类造成严重危害,该类废水的治理问题已成为水处理领域难点部分,因此,寻找有效的治理方法迫在眉睫。电催化氧化技术具有良好的环境兼容性和普遍的适用性,在废水处理领域得到了广泛的关注与应用。在电催化氧化处理废水过程中,阳极材料对有机污染物的降解效果起着至关重要的作用,尤其对处理过程所耗能量和氧化降解效率的影响较大。本论文制备了电催化活性较高的、稳定性较好的电极材料,并将其分别应用于多种苯系废水的电催化氧化处理中。主要的研究内容如下:采用微波等离子气相沉积法制备了掺硼金刚石电极,以该电极为阳极,不锈钢电极作为阳极与阴极,电催化降解间二硝基苯废水。实验结果表明,在较佳的降解条件下,即电流密度为10 m A cm-2、温度为30℃、p H为7.0、Na2SO4电解质浓度为4.0 g L-1、间二硝基苯的初始浓度为125 mg L-1,处理间二硝基苯废水150 min,间二硝基苯的去除率可达82.7%。对间二硝基苯的电催化降解过程的数据分析,结果显示,间二硝基苯的降解符合一级动力学方程。紫外光谱和高效液相色谱分析表明,间二硝基苯在240 min以后会被完全矿化。采用刷涂法制备了Ti/Sn O2-Ru O2电极,分别以该电极与不锈钢电极作为阳极与阴极,电催化降解处理4-硝基苯甲醛废水。实验结果表明,在较佳的降解条件下,即电解质Na2SO4的浓度为8.0×10-2 mol L-1、p H为2.5、电解电压为3 V,处理4-硝基苯甲醛废水180 min,4-硝基苯甲醛去除79.8%,CODCr去除率达82.3%。对4-硝基苯甲醛的电催化降解过程的数据分析可知,4-硝基苯甲醛的降解符合一级动力学方程。采用电沉积法制备了Ti/Pb O2电极和Ti/Pb O2-Yb2O3电极,并将其用作阳极,不锈钢电极为阴极,电催化氧化降解二硝基重氮酚废水。实验结果表明,Ti/Pb O2-Yb2O3电极的结构更为紧密,析氧电位较高,电催化降解性能更好。在较佳的降解条件下,即电流密度为10 m A cm-2、初始p H为3.0、Na2SO4电解质浓度为12.5 g L-1,处理二硝基重氮酚废水150 min,二硝基重氮酚的去除率和CODCr的去除率分别为92.9%和89.5%。采用溶胶凝胶法制备了Ti/Sn O2-Sb电极与掺杂Cu的Ti/Sn O2-Sb-Cu电极。分别使用Ti/Sn O2-Sb或Ti/Sn O2-Sb-Cu电极为阳极,不锈钢电极为阴极,电催化降解2,4,6-三硝基苯酚废水。实验结果表明,Ti/Sn O2-Sb-Cu电极结构更为紧密,电催化降解性能更好。在较佳的降解条件下,即电流密度为5 m A cm-2、初始p H为3.0、Na Cl电解质浓度为8.0 g L-1,处理2,4,6-三硝基苯酚废水150 min,2,4,6-三硝基苯酚废水中CODCr去除率为91.3%,三硝基苯酚的去除率为92.7%。本论文的研究结果表明,电催化氧化法是一种有效的处理方法,为苯系有机废水的处理提供了更为广阔的思路。Ti/Sn O2-Ru O2电极、掺硼金刚石电极、Ti/Pb O2-Yb2O3电极以及Ti/Sn O2-Sb-Cu电极在难降解的有机废水处理领域具有较好的应用前景。
[Abstract]:Highly toxic and refractory benzene-series wastewater will cause serious harm to the environment and human beings. The treatment of this kind of wastewater has become a difficult part in the field of water treatment. Therefore, it is urgent to find effective treatment methods. Electrocatalytic oxidation technology has been widely used in wastewater treatment due to its good environmental compatibility and universal applicability. In the process of electrocatalytic oxidation treatment of wastewater, anode materials play an important role in the degradation of organic pollutants, especially on the energy consumption and oxidation degradation efficiency of the treatment process. In this paper, electrode materials with high electrocatalytic activity and good stability were prepared and applied to the electrocatalytic oxidation treatment of various benzene-series wastewater. The main research contents are as follows: boron doped diamond electrode was prepared by microwave plasma vapor deposition. The electrode was used as anode and stainless steel electrode as anode and cathode to degrade m-dinitrobenzene wastewater by electrocatalysis. The experimental results show that under better degradation conditions, That is, the current density is 10 m A cm-2, the temperature is 30 鈩，

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