两种电极电催化氧化降解苯系染料废水的研究

发布时间：2018-05-06 15:27

  本文选题：Ti/IrO_2-RuO_2电极 + Ti/Ta_2O_5-Pt电极　； 参考：《西南科技大学》2017年硕士论文

【摘要】：随着现代工业和经济的发展,多种高毒性、高色度、难降解的苯系废水给人类赖以生存的环境造成了严重的威胁,苯系染料废水的处理和无污染排放已经成为倍受人们关注的问题。近年来,电化学氧化法广泛的环境兼容性和独特的强氧化能力,使其引起了人们的关注。电化学氧化技术中,阳极材料是影响废水处理效率的关键因素。本论文采用热分解法制备了 Ti/IrO2-RuO2和Ti/Ta2O5-Pt电极,并将其应用于灿烂甲酚蓝(BCB)、苯酚红(PR)及孔雀石绿(MG)废水的电催化降解。主要内容如下:(1)以IrC13·3H20和RuC13·3H2O为原料,采用热分解法成功制得Ti/IrO2-RuO2电极。通过扫描电子显微镜(SEM)、能谱(EDS)和X射线衍射(XRD)表征了 Ti/IrO2-RuO2电极的形貌、元素组成和结构。线性扫描伏安法测试(LSV)表明,随着电位的增大,自制Ti/IrO2-RuO2电极在1.24 V(vs.SCE)附近发生明显的析氧反应。用自制Ti/IrO2-RuO2电极电催化氧化降解100 mg.L-1的BCB废水(初始化学需氧量CODCr,0 = 558.76 mg.L-1),研究了电解时间、电解电压、电解质浓度、电极间距和反应温度对BCB降解效率的影响。结果表明,在电解电压为3.0 V、电解质Na2SO4的浓度为6.0 g·L-1、电极间距为3 cm、反应温度为50 ℃、电解120 min时,BCB废水的COD去除率为78.4%,BCB降解率为77.1%,说明Ti/IrO2-RuO2电极对噻吩嗪类苯系染料废水表现出良好的催化活性和较高的降解效率。(2)PR是一种色度高、毒性大的苯系染料,PR废水性质稳定,难降解。采用自制Ti/IrO2-RuO2电极电催化氧化降解100 mg·L-1的PR废水(初始化学吸氧量CODCr,0=385.97mg·L-1),考察了电解时间、电流密度、电解质浓度、废水初始pH以及反应温度对PR降解效率的影响。结果表明,在电流密度为15 mA·cm-2、电解质Na22SO4的浓度为6.0g·L-1、废水溶液起始pH=7、反应温度为40 ℃、电解120min时,Ti/IrO2-RuO2电极对PR废水具有较高的电催化降解活性,PR废水的COD去除率为75.4%,PR降解率为74.5%。(3)以TaCl5和H2PtCl6为原料,采用热分解法成功制得Ti/Ta2O5-Pt电极。通过扫描SEM、EDS和XRD表征了Ti/Ta2O5-Pt电极的形貌、元素组成和结构。结果表明,Ti/Ta2O5-Pt电极与Ti/IrO2-RuO2电极有相似的表面形貌。LSV测试表明,自制Ti/Ta2O5-Pt电极的析氧电位在1.18V(vs.SCE)左右。用自制Ti/Ta2O5-Pt电极电催化氧化降解30 mg.L-1的MG废水(初始化学需氧量CODCr,0=A85.85mg·L-1),研究了废水初始pH、电解质浓度、电流密度和反应温度对MG降解效率的影响。结果表明,在废水初始pH = 4、电解质Na2SO4的浓度为6.0g·L-1、电流密度为15mA·cm-2、反应温度为30℃、电解120 min时,MG废水的降解率为82.2%,COD去除率为80.5%,说明Ti/Ta2O5-Pt电极对三苯甲烷类苯系染料废水表现出良好的催化活性和较高的降解效率。研究结果表明,自制Ti/IrO2-RuO2和Ti/Ta2O5-Pt电极在电催化氧化处理噻吩嗪类、苯酚红、三苯基甲烷类等苯系染料废水领域具有一定的应用前景。
[Abstract]:With the development of modern industry and economy, many kinds of highly toxic, high-chromatic and refractory benzene-series wastewater pose a serious threat to the environment on which human beings depend for survival. The treatment and non-pollution discharge of benzene dye wastewater have been paid more and more attention. In recent years, electrochemical oxidation has attracted much attention due to its extensive environmental compatibility and unique strong oxidation ability. In electrochemical oxidation technology, anode material is the key factor affecting wastewater treatment efficiency. In this paper, Ti/IrO2-RuO2 and Ti/Ta2O5-Pt electrodes were prepared by thermal decomposition method and were applied to the electrocatalytic degradation of brilliant cresol blue (BCB) and malachite green (M G) wastewater. The main contents are as follows: (1) IrC13 3H20 and RuC13 3H2O are used as raw materials to prepare Ti/IrO2-RuO2 electrode successfully by thermal decomposition. The morphology, elemental composition and structure of Ti/IrO2-RuO2 electrode were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Linear scanning voltammetry (LV) showed that the oxygen evolution reaction of self-made Ti/IrO2-RuO2 electrode was obvious near 1.24V vs.SCE with the increase of potential. The effects of electrolysis time, electrolytic voltage, electrolyte concentration, electrode spacing and reaction temperature on the degradation efficiency of 100 mg.L-1 BCB wastewater (initial COD ~ (2 +) = 558.76 mg 路L ~ (-1) were studied by electrocatalytic oxidation with self-made Ti/IrO2-RuO2 electrode. The results show that the electrolysis voltage is 3.0 V, the concentration of electrolyte Na2SO4 is 6.0 g / L ~ (-1), the electrode spacing is 3 cm, and the reaction temperature is 50 鈩，

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