本文選題：二氧化鉛 + 電芬頓��； 參考：《蘇州科技學院》2015年碩士論文

【摘要】：為了處理難生物降解有機污染物,制備了形穩(wěn)性陽極(DSA)與介孔碳/PTFE氣體擴散陰極。探索了陰陽極協(xié)同作用處理有機污染物的可行性,研究結果如下:(1)制備了聚乙二醇(PEG)改性Ti/Sb-SnO2/PEG-PbO2電極,分別用線性伏安掃描(LSV)、掃描電鏡(SEM)、X射線衍射(XRD)、計時電流、電極加速壽命等方法對電極性能進行了表征,并以鄰甲酚為目標污染物,考察了PEG改性PbO2電極的電催化氧化性能。研究結果表明,摻雜PEG后,電極的電催化活性以及穩(wěn)定性均得到提高,PEG最佳摻雜量為9g/L。在此條件下制備的PbO2電極,其析氧電位為2.48V,強化電極壽命為114h,是未修飾電極的3.35倍。利用該電極降解鄰甲酚模擬廢水,鄰甲酚去除率隨著其初始濃度增加而下降,當初始鄰甲酚濃度為100mg/L、溶液初始pH=10、電流密度為10 mA/cm2時,1.5h鄰甲酚去除率為100%。鄰甲酚的降解反應是·OH參與的間接氧化反應,且遵循一級動力學規(guī)律。(2)利用介孔碳CMK-3與聚四氟乙烯(PTFE)制備了CMK-3/PTFE氣體擴散電極。作為反應體系的陰極,利用電芬頓反應電催化降解鄰甲基苯酚,溶液中的溶解O2在陰極表面發(fā)生還原反應生成H2O2,同時探究了不同實驗因素對電極電催化活性的影響。實驗結果表明,當CMK-3與PTFE的質量比為1:1時,對應的電極催化活性最高。當控制Na2SO4支持電解質濃度為0.1mol/L、初始pH=3、初始電流密度為9mA/cm2、外界曝氣量為1.5L/min時,通電150min后,溶液中H2O2的含量達到122mg/L。(3)以自制Ti/Sb-SnO2/PEG-PbO2作為陽極,CMK-3/PTFE氣體擴散電極作為陰極,組建了陰陽極協(xié)同催化體系來降解有機污染物,考察了不同的實驗條件對于鄰甲基苯酚的去除效果。實驗結果表明,電流密度、鄰甲基苯酚初始濃度、初始pH、支持電解質濃度均對最終降解效果有一定影響。當初始電流密度為9mA/cm2,在中性條件下,支持電解質Na2SO4濃度為0.1mol/L,反應120min后,鄰甲基苯酚去除率可以達到100%。
[Abstract]:In order to deal with difficult biodegradable organic pollutants, stable anode DSAs and mesoporous carbon / PTFE gas diffusion cathodes were prepared. The feasibility of the synergistic action of cathode and anode in the treatment of organic pollutants was explored. The results are as follows: (1) Polyethylene glycol (PEG) modified Ti/Sb-SnO2/PEG-PbO2 electrode was prepared. The modified electrode was characterized by linear voltammetry, X-ray diffraction and chronoelectric current, respectively. The electrocatalytic oxidation of PEG modified PbO2 electrode was investigated with o-cresol as the target pollutant. The results show that the electrocatalytic activity and stability of the electrode can be improved by doping PEG with the optimum doping amount of 9g / L. Under these conditions, the oxygen evolution potential of the PbO2 electrode is 2.48 V, and the life of the enhanced electrode is 114 h, 3.35 times of that of the unmodified electrode. The removal rate of o-cresol decreased with the increase of the initial concentration of o-cresol. When the initial concentration of o-cresol was 100mg / L, the initial pH value of solution was 10 mg / L, and the current density was 10 mA/cm2, the removal rate of o-cresol was 100g 路L ~ (-1). The degradation of o-cresol is an indirect oxidation reaction in which OH is involved, and follows the first-order kinetics. The CMK-3/PTFE gas diffusion electrode was prepared by using mesoporous carbon CMK-3 and PTFE. As the cathode of the reaction system, the electrocatalytic degradation of o-methylphenol was carried out by electrocatalytic Fenton reaction. The dissolved O2 in the solution reduced to H _ 2O _ 2 on the cathode surface to form H _ 2O _ 2. At the same time, the effects of different experimental factors on the electrocatalytic activity of the electrode were investigated. The experimental results show that the corresponding electrode has the highest catalytic activity when the mass ratio of CMK-3 to PTFE is 1:1. When the supporting electrolyte concentration of Na2SO4 is 0.1 mol / L, the initial pH is 3, the initial current density is 9 Ma / cm ~ 2, and the external aeration is 1.5L/min, the content of H2O2 in the solution reaches 122 mg / L 路L ~ (-3) after the 150min is electrified. The self-made Ti/Sb-SnO2/PEG-PbO2 is used as the cathode of the anode CMK-3 / PTFE gas diffusion electrode. The co-catalytic system of cathode and cathode was set up to degrade organic pollutants, and the removal efficiency of o-methylphenol was investigated under different experimental conditions. The results showed that the current density, initial concentration of o-methylphenol, initial pH and the concentration of supporting electrolyte had certain influence on the final degradation effect. When the initial current density is 9 Ma / cm ~ 2 and the concentration of supporting electrolyte Na2SO4 is 0.1 mol / L under neutral conditions, the removal rate of o-methylphenol can reach 100% after the reaction of 120min.
【學位授予單位】：蘇州科技學院
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：O646.54;X703

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相關期刊論文 前1條

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本文編號：1832807