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1、阴极异相电芬顿法降解染料废水 西安建筑科技大学 本科毕业设计（论文） 题 目 Fe2O3/ACF阴极异相电Fenton法 学生姓名 学 号 院（系） 专 业 指导教师 时 间 降解染料废水 应用化学 年 月 日 摘要 芬顿技术是一种处理范围广、处理效率高的水处理技术。然而，传统芬顿处理技术的有效pH值范围在3.0附近，并需要加入铁盐和过氧化氢等试剂，增加后续处理成本。针对芬顿技术的缺点，本文将Fe2O3负载于活性炭纤维（Activated carbon fiber, ACF）表面，以该复合阴极用于电芬顿体系中，在线还原溶解氧产生过氧化氢，并与负载的金属离子发生电芬顿反应，用于孔雀石绿的降解。
2、本文探讨了循环伏安法制备复合阴极的条件（FeSO4浓度、循环次数、负载液pH、热处理度）对Fe2O3/ACF复合阴极材料性能的影响，以及电芬顿反应条件（溶液初始pH、电解电位、支持电解质Na2SO4浓度、溶液温度）对孔雀石绿去除率的影响。采用紫外可见分光光度仪对孔雀石绿去除率和过氧化氢含量进行了测定。使用荧光分光光度计对香豆素捕捉羟基自由基过程中产生的7-羟基香豆素含量进行了检测，采用TOC仪对溶液TOC进行了测定。 实验结果表明，制备Fe2O3/ACF的最佳条件为：FeSO4浓度0.33 molL-1，循环伏安法循环次数8次，pH7.0，热处理温度300oC。用于电芬顿反应降解孔雀石绿的最佳
3、反应条件为：溶液初始pH3.0，电解电位?1.0 V，Na2SO4浓度0.05 molL-1，溶液温度30oC。最佳条件下，孔雀石绿去除率达100%，TOC去除率达88.55%。通过?OH的测定表明将Fe2O3负载于ACF表面，使体系产生了羟基自由基。对反应机理的探讨表明?O2?、?OH均参与了氧化去除孔雀石绿，?O2?的作用不可忽视；而ACF阴极体系中没有?OH，由?O2?氧化去除孔雀石绿。 关键词：电芬顿，活性炭纤维，孔雀石绿，羟基自由基 Abstract Fenton reagent is widely used in water treatment that has high effi
4、ciency. However, the effective pH range of the traditional Fenton processing techniques is around 3.0, and it needs to add iron salt and hydrogen peroxide and other reagents, increasing the processing cost. In order to overcome the defect of traditional Fenton technology, in this thesis, Fe2O3 was l
5、oaded at the surface of activated carbon fiber （ACF）to prepare the composite cathode and used in Electro-Fenton system to produce hydrogen peroxide by electro-reducing dissolved oxygen. The metal ions at ACF surface can make Electro-Fenton reaction with the electro-produced hydrogen peroxide to degr
6、ade malachite green (MG). This thesis investigated the conditions (the concentration of FeSO4, the sweep segments, the pH of loading solution and the heat treatment temperature) for preparing the composite cathode by cyclic voltammetry and the conditions of Electro-Fenton reaction including the pH o
7、f simulated wastewater, the electrolysis potential, the concentration of Na2SO4 and the temperature of wastewater which influenced the removal percentage of MG. UV-Vis spectrometric was used to determine the color removal rate of MG and production rate of hydrogen peroxide. The fluorescence spectrop
8、hotometer was used to detect the content of 7-hydroxy coumarin produced during coumarin capturing hydroxyl radicals, the TOC analyzer was used to determine TOC value of wastewater. The experimental results showed that when the concentration of FeSO4 was 0.33 molL-1, the sweep segments was 8 times, t
9、he pH of loading solution was 7.0, the heat treatment temperature was 300oC, the Fe2O3/ACF cathode for the removal of MG was best. The optimum conditions of degrading MG was that the pH of solution was 3.0, the electrolysis potential was -1.0 V, the concentration of Na2SO4 was 0.05 molL-1 and the te
10、mperature was 30oC. The removal percentage of MG was 100% and the TOC removal percentage was 88.55% under the optimum conditions. The measure of ?OH showed that Fe2O3/ACF surface generated ?OH. Discussion on the reaction mechanism suggested that ?OH and ?O2? were involved in removing MG. The effect
11、of ?O2? can not be ignored, and the ?O2? can oxidize MG in the ACF cathode system without ?OH. Key Words: Electro-Fenton(EF); activated carbon fiber(ACF); malachite green(MG); hydroxyl radical 目 录 1 绪论 . （1） 1.1 研究背景 . （1） 1.1.1 水体的污染及概况 . （1） 1.1.2 水体有机污染特点及其危害 . （1） 1.2 水体中有机污染物处理技术及发展 . （2） 1.2.1 物理处理法 . （2） 1.2.2 生物处理法 . （5） 1.2.3 物化-生物联合法 . （6） 1.2.4 化学处理法 . （6） 1.3 芬顿法 . （9） 1.3.1 芬顿技术的发展历史 . （9） 1.3.2 芬顿法基本原理 . （9） 1.3.3 芬顿体系水处理应用中存在的问题 . （9） 1.4 电芬顿法 . （10） 1.4.1 基本作用原理 . （10） 1.5 研究意义与内容 . （12） 1.5.1 研究意义 .
