活性碳纤维阴极电Fenton处理活性蓝49的条件影响及降解机理

The Factors and Mechanism of Electro-Fenton Degradation of C.I. Reactive Blue 49 Using Activated Carbon Fiber Cathode

采用活性碳纤维阴极电Fenton法处理蒽醌类染料(活性蓝49,RB49)模拟废水。研究了Fe2+浓度、pH、染料初始浓度和电流密度对RB49溶液TOC去除率的影响。当pH为3.0,RB49初始浓度为100 mg/L,Fe2+浓度为0.5 mmol/L,电流密度为3 mA/cm2时,反应6 h后TOC降解率到达90%,表明电Fenton降解RB49模拟废水效果显著。此外,根据GC-MS中间产物的测定结果,发现降解过程中主要中间产物为水杨醛,水杨酸和2-亚硝基苯甲醛及其他有机类中间产物,从而推断出电Fenton降解RB49的可能途径。

The electro-Fenton degradation was designed to treat the anthraquinone dyes（C.I.Reactive Blue 49,RB49） as the simulated wastewater by using activated carbon fiber cathode.The effect of the concentration of Fe2＋,pH,initial concentration of dye and current density for the removal of total organic carbon（TOC） was examined.When pH 3.0,the initial concentration 100 mg/L,the concentration of Fe2＋ 0.5 mmol/L and current density 3 mA/cm2,the removal of TOC values reached 90 % after 6 h,indicating the electro-Fenton degradation of RB49 simulated wastewater was significantly effective.Additionally,based on the major aromatic intermediates identified by GC-MS spectrometry,including salicylaldehyde,salicylic acid and 2-nitrosobenzaldehyde,etc.,a possible degradation pathway of RB49 was proposed.