本文選題：電催化氧化 + 陽極��； 參考：《沈陽工業(yè)大學》2017年碩士論文

【摘要】：工業(yè)飛速的發(fā)展給人們生活帶來便利的同時也帶來了環(huán)境的污染,苯酚廢水作為工業(yè)生產(chǎn)中常見的污染物亟需人們投入更多的精力去解決。電催化氧化是電化學水處理技術中具有前景的一種經(jīng)濟節(jié)能、可控性好的降解方法。通常人們使用電催化氧化技術處理廢水只采用一種陽極,本實驗一改往日傳統(tǒng)做法,采用兩種不同種類的陽極進行組合來降解苯酚模擬廢水,具體研究成果如下:選取了活性陽極Ti/Ir-RuO_x(析氯)、Ti/Ir-TaO_x(析氧)和非活性陽極Ti/PbO_2、Ti/SnO_2-Sb-Mo作為實驗電極,其中采取SEM、EDS等電化學氧化技術對實驗室自制Ti/SnO_2-Sb-Mo電極進行了表征,結(jié)果表明摻雜Mo的Ti/SnO_2-Sb電極有利于提高電極的電催化活性、穩(wěn)定性和壽命。對四種電極降解苯酚模擬廢水的槽電壓進行了測定與分析,得出四種電極穩(wěn)定性能比較強、電催化氧化活性比較好的結(jié)論,四種電極在電催化降解廢水方面具有代表性,其中Ti/Ir-RuO_x單陽極和Ti/Ir-RuO_xTi/PbO_2槽電壓最小,為3.3V,有利于降低降解過程中的能耗,提高電流效率。分別考察了電流密度、溶液初始pH、苯酚模擬廢水初始濃度和電解質(zhì)種類對單、雙陽極降解苯酚模擬廢水的影響。實驗表明,苯酚模擬廢水去除率隨和電流密度的增大而遞增,綜合考慮廢實際處理效果和經(jīng)濟可行性,確定實驗電流密度為10mA/cm~2;溶液初始pH為7時苯酚處理效果最好,酸堿度過高、過低都不利于苯酚的降解;苯酚初始濃度為100mg/L時降解效果好于50mg/L和200mg/L;在以Na_2SO_4為電解質(zhì)的基礎上加入少量NaCl有助于提高降解速率和去除率。分別比較了單、雙陽極對苯酚模擬廢水降解效果。在同等最佳反應條件下,四種單陽極電極中Ti/PbO_2電極對苯酚模擬廢水的降解效果要好于其他三種電極,去除率高達98.2%;Ti/PbO_2電極降解苯酚模擬廢水過程經(jīng)歷了先將其降解為小分子中間產(chǎn)物,再進一步被降解的過程;四種雙陽極電極中Ti/Ir-RuO_xTi/PbO_2和Ti/Ir-RuO_xTi/SnO_2-Sb-Mo兩種雙陽極對苯酚模擬廢水的降解更有規(guī)律,降解效果更好,去除率可分別達到98.4%和98.8%;雙陽極降解廢水過程反應更為劇烈,現(xiàn)象更明顯,反應速率更高,去除效果更好;活性陽極與非活性陽極的組合有利于兼顧電極的電催化氧化活性與穩(wěn)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.

【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X703

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本文編號：1859886