钛基金属氧化物阳极的制备及其对有机物废水处理的研究

发布时间：2018-05-31 18:41

本文选题：钛基金属氧化物阳极 + 有机物废水　；参考：《上海师范大学》2017年硕士论文

【摘要】：21世纪全球经济飞速发展,作为稀缺战略和生存资源之一的水资源,其污染问题已经成为各国亟待解决的重大问题之一,伴随着人类生活和发展的过程,水资源的污染态势每况愈下。由于地球淡水资源紧缺,可供人类使用的水源少之又少,各个行业如钢铁,石油,印染,纺织等等的生产都会伴随着水资源的使用和废水排放,从各行业废水排放国家标准来看,废水本身具有的复杂成分和含量波动为水处理工艺带来了极大的挑战,诸多水处理的新工艺新方法也应运而生。目前,DSA阳极电化学氧化法受到较多的关注。但是,由于DSA阳极的稳定性和电催化氧化性能的限制,从而使得其在使用过程中出现了寿命短,催化活性不高,效率偏低等问题。因此,找到一种催化性能好的长寿命电极是我们的研究目的。本论文分别采用了锰和铈的氧化物对锡锑阳极进行改性,并通过各类测试方法探究了其实际使用性能。主要结果如下:(1)采用MnO_2掺杂于锡锑氧化物的镀层中,利用锰的掺杂影响锡的结晶成型。采用SEM,XRD等测试方法对电极的物理性质进行了表征,结果表明,改性后电极表面镀层均匀覆盖,锡和锰的氧化物的形成以及紧密结合大大提高了电极的抗腐蚀能力。同时在电性能上,制备电极的析氧电位达到2.3V,加速测试条件下的电极寿命达到约41 h。在采用该制备电极对含苯酚废水进行实际降解时,COD去除率在6 h时能达到80%以上,表明电极的使用效果得到了很大的提高。(2)利用铈的氧化物掺杂改善电极的多孔结构,提高电极的有效活性面积及催化活性,采用SEM,XRD等测试方法对电极物理性质进行表征,结果表明,本电极与锰掺杂电极的表面相比发生较大改变,出现晶粒细化现象,无明显裂隙,镀层结合度较好。电性能测试结果表明,析氧电位达2.48V;加速测试条件下寿命达39h;实际降解时,COD去除率在2h可达50%,电极的电性能大幅提高。(3)电极应用于实际降解过程时,羟基自由基掩蔽实验证明了电极的催化氧化过程遵循自由基的氧化机理,各种影响因素的确定使电极工作得到了最佳运行条件。将电极放大后电极的效果得到了证实,自制电极可以有效对有机物进行降解。
[Abstract]:With the rapid development of the global economy in the 21st century, as one of the scarce strategies and living resources, the pollution of water resources has become one of the most important problems to be solved by all countries, along with the process of human life and development. The pollution of water resources is getting worse and worse. Due to the shortage of fresh water resources on the earth, there are very few water sources available for human use. The production of various industries such as steel, oil, printing and dyeing, textiles and so on will be accompanied by the use of water resources and the discharge of waste water. According to the national standards of wastewater discharge in various industries, the fluctuation of complex components and contents of wastewater itself brings great challenges to the water treatment process, and many new processes and new methods of water treatment have emerged as the times require. At present, DSA anodic electrochemical oxidation method has received more attention. However, due to the limitation of the stability of DSA anode and the performance of electrocatalytic oxidation, some problems such as short life, low catalytic activity and low efficiency appear in the process of application. Therefore, it is our aim to find a long-life electrode with good catalytic performance. In this paper, tin antimony anode was modified by manganese and cerium oxides, and its practical performance was investigated by various testing methods. The main results are as follows: (1) MnO_2 was used to doped tin antimony oxide coating, and manganese doping was used to influence the crystallization of tin. The physical properties of the electrode were characterized by means of SEM XRD and other methods. The results showed that the corrosion resistance of the electrode was greatly improved by the uniform coating, the formation of tin and manganese oxides and the close combination of tin and manganese. At the same time, the oxygen evolution potential of the prepared electrode is 2.3 V, and the electrode lifetime is about 41 h under the accelerated test condition. The removal rate of COD can reach more than 80% at 6 h when the prepared electrode is used to degrade the wastewater containing phenol, which indicates that the effect of the electrode is greatly improved. 2) the porous structure of the electrode is improved by doping cerium oxide. The effective active area and catalytic activity of the electrode were improved, and the physical properties of the electrode were characterized by means of SEM XRD and other methods. The results showed that the surface of the electrode changed greatly compared with the manganese doped electrode, and the grain size was refined. No obvious cracks, the coating bonding is better. The results of electrical property test show that the oxygen evolution potential is 2.48 V, the life span is 39 h under accelerated test condition, the removal rate of COD can reach 50% in 2 h, and the electric property of the electrode is greatly improved when the electrode is used in the actual degradation process. The hydroxyl radical masking experiment proved that the catalytic oxidation of the electrode followed the oxidation mechanism of free radical, and the determination of various influencing factors made the electrode work under the best operating conditions. The effect of electrode amplification has been confirmed, and self-made electrode can effectively degrade organic matter.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O646;X703

【参考文献】