三维电极／电Fenton法处理苯酚废水机理研究

目的确定三维电杉电Fenton法处理苯酚废水的最佳反应条件并探讨反应机理．方法设计正交试验确定最佳反应条件，对处理结果进行紫外光谱分析；采用叔丁醇验证·OH的存在．结果在最佳反应条件pH值3，电解电压为12V，极板间距为10．5cm，电解质投加质量浓度为1．2g/L，Fe^2＋投加浓度为0．9mmol／L条件下，苯酚最大去除率为97．38％．苯酚去除率影响因素大小为pH值〉电解电压〉Fe^2＋投加浓度〉极板间距〉电解质投加质量浓度．反应过程中，苯酚首先被降解为醌类化合物并进一步降解为其他中间产物，最终被氧化为小分子化合物．结论苯酚的去除主要是电极的直接氧化，·OH以及其他活性氧化物共同作用的结果，其中·OH对苯酚的降解起到主要作用．

Study on Mechanism of Phenol Wastewater Degradation by Three-Dimensional/Electrode-Fenton Method

The purpose of this paper is to determine the optimal reaction conditions of the treatment for phenol wastewater by three-dimensional electrode/electric Fenton method and to explore the reaction mech- anism. Optimal reaction conditions were determined through the design of orthogonal experiment, the treatment results were analyzed by UV spectroscopy;the OH existence was verified by dosing tert-butanol. The results showed that the most removal rate of phend reached 97.38 % under the conditions of：pH was 3, the electrolysis voltage was 12 V,the plate distance was 10. 5cm, the dosing electrolyte concentration was 1.2 g/L, and Fe^2＋ dosing concentration was 0.9 mmol/L. And the primary factor affecting the phenol deg- radation was pH value 〉 electrolysis voltage 〉 Fe^2＋ dosing concentration 〉 the plate distance 〉 electrolyte dosing concentrations. Phenol is the first degraded to a quinone compound and further degraded to the other intermediate products, ultimately it is oxidized to a small molecule compound. Phenol removal was the com- mon results of direct electrode oxidation, OH, and other reactive species, but · OH contribution is the most imoortant.