不同金属氧化物阳极类型组合降解苯酚过程比较分析

发布时间：2018-05-08 04:09

本文选题：电催化氧化 + 阳极　；参考：《沈阳工业大学》2017年硕士论文

【摘要】：工业飞速的发展给人们生活带来便利的同时也带来了环境的污染,苯酚废水作为工业生产中常见的污染物亟需人们投入更多的精力去解决。电催化氧化是电化学水处理技术中具有前景的一种经济节能、可控性好的降解方法。通常人们使用电催化氧化技术处理废水只采用一种阳极,本实验一改往日传统做法,采用两种不同种类的阳极进行组合来降解苯酚模拟废水,具体研究成果如下:选取了活性阳极Ti/Ir-RuO_x(析氯)、Ti/Ir-TaO_x(析氧)和非活性阳极Ti/PbO_2、Ti/SnO_2-Sb-Mo作为实验电极,其中采取SEM、EDS等电化学氧化技术对实验室自制Ti/SnO_2-Sb-Mo电极进行了表征,结果表明掺杂Mo的Ti/SnO_2-Sb电极有利于提高电极的电催化活性、稳定性和寿命。对四种电极降解苯酚模拟废水的槽电压进行了测定与分析,得出四种电极稳定性能比较强、电催化氧化活性比较好的结论,四种电极在电催化降解废水方面具有代表性,其中Ti/Ir-RuO_x单阳极和Ti/Ir-RuO_xTi/PbO_2槽电压最小,为3.3V,有利于降低降解过程中的能耗,提高电流效率。分别考察了电流密度、溶液初始pH、苯酚模拟废水初始浓度和电解质种类对单、双阳极降解苯酚模拟废水的影响。实验表明,苯酚模拟废水去除率随和电流密度的增大而递增,综合考虑废实际处理效果和经济可行性,确定实验电流密度为10mA/cm~2;溶液初始pH为7时苯酚处理效果最好,酸碱度过高、过低都不利于苯酚的降解;苯酚初始浓度为100mg/L时降解效果好于50mg/L和200mg/L;在以Na_2SO_4为电解质的基础上加入少量NaCl有助于提高降解速率和去除率。分别比较了单、双阳极对苯酚模拟废水降解效果。在同等最佳反应条件下,四种单阳极电极中Ti/PbO_2电极对苯酚模拟废水的降解效果要好于其他三种电极,去除率高达98.2%;Ti/PbO_2电极降解苯酚模拟废水过程经历了先将其降解为小分子中间产物,再进一步被降解的过程;四种双阳极电极中Ti/Ir-RuO_xTi/PbO_2和Ti/Ir-RuO_xTi/SnO_2-Sb-Mo两种双阳极对苯酚模拟废水的降解更有规律,降解效果更好,去除率可分别达到98.4%和98.8%;双阳极降解废水过程反应更为剧烈,现象更明显,反应速率更高,去除效果更好;活性阳极与非活性阳极的组合有利于兼顾电极的电催化氧化活性与稳定性。
[Abstract]:The rapid development of industry brings convenience to people's life, but also brings environmental pollution. As a common pollutant in industrial production, phenol wastewater needs more energy to be put in. Electrocatalytic oxidation is a promising method of economic energy saving and good controllability in electrochemical water treatment. The use of electrocatalytic oxidation technology to treat wastewater is only a kind of anode. In this experiment, the traditional practice was changed in the past. Two kinds of different kinds of anodes were used to combine to degrade phenol simulated wastewater. The specific research results were as follows: the active anode Ti/Ir-RuO_x (chlorine evolution), Ti/ Ir-TaO_x (oxygen evolution) and inactive anode Ti/PbO_2, Ti/SnO_2-Sb-Mo were selected as the following. For the experimental electrode, the electrochemical oxidation technology, such as SEM and EDS, was used to characterize the self-made Ti/SnO_2-Sb-Mo electrode in the laboratory. The results showed that the Ti/SnO_2-Sb electrode of doping Mo was beneficial to improve the electrocatalytic activity, stability and life of the electrode. The voltage of four kinds of electrodes for degradation of phenol simulated wastewater was measured and analyzed, and four was obtained. The stable performance of the electrode is strong and the activity of electrocatalytic oxidation is good. The four electrodes are representative in the field of electrocatalytic degradation of wastewater. The voltage of Ti/Ir-RuO_x single anode and Ti/Ir-RuO_xTi/PbO_2 slot is 3.3V, which is beneficial to reduce energy consumption and increase current efficiency in the degradation process. Initial pH, the effect of phenol simulated wastewater initial concentration and electrolyte type on the degradation of phenol simulated wastewater by single and double anode. The experiment shows that the removal rate of phenol simulated wastewater increases with the increase of current density, considering the effect of waste treatment and economic feasibility, the experimental current density is 10mA/cm~2, and the initial pH of solution is 7 phenol. The treatment effect is the best, high pH is too high, too low is not conducive to the degradation of phenol. When the initial concentration of phenol is 100mg/L, the degradation effect is better than that of 50mg/L and 200mg/L. The addition of a small amount of NaCl on the basis of Na_2SO_4 as electrolyte helps to improve the degradation rate and removal rate. Under the same optimum reaction conditions, the degradation effect of Ti/PbO_2 electrode in four single anode electrodes on phenol simulated wastewater is better than that of other three electrodes, the removal rate is up to 98.2%. The degradation process of phenol simulated wastewater by Ti/PbO_2 electrode has experienced the process of degradation of small molecular intermediate products first, then one step was degraded, and Ti/ in the four double anode electrodes. The degradation of phenol simulated wastewater by two kinds of Ir-RuO_xTi/PbO_2 and Ti/Ir-RuO_xTi/SnO_2-Sb-Mo is more regular, the degradation effect is better, the removal rate can reach 98.4% and 98.8%, the reaction of the double anode degradation wastewater is more intense, the phenomenon is more obvious, the reaction rate is higher, the removal effect is better, the combination of the active anode and the inactive anode is better. It is beneficial to the electrocatalytic oxidation activity and stability of electrodes.

【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

【参考文献】