阴阳极同时作用电化学法降解水中甲基橙

The Degradation of Methyl Orange in Water by Electrochemical Method for the Interaction of Cathode and Anode

目的研究阴阳极共同作用电化学法的最优电极组合,确定在最优电极下处理水中甲基橙的工艺条件.方法在自制电化学反应器中,通过阴阳极同时作用电化学法降解水中甲基橙的试验,分析Fe3+浓度、Cl-浓度、电流密度各因素对甲基橙脱色率的影响,并通过紫外-可见光谱对反应产物进行定性分析.结果阳极采用钛基铱涂层化学稳定性好、催化性能高、电极电位高;阴极采用钛板具有很高的析氢过电位.当Fe3+浓度为1 mmol/L、Cl-浓度为11 mmol/L、电流密度为7.5 m A/cm2时,甲基橙的脱色率可达90%以上.结论阴阳极同时作用电化学法降解水中甲基橙能很好地脱色,其分子中偶氮结构的n-π*和苯环共轭体系的π-π*结构均遭到了破坏;阴阳极同时作用电化学法处理甲基橙的效果较好.

The process conditions for treatment of methyl orange in water was studied on the optimal electrode combination of the electrochemical method for the interaction of cathode and anode.In the self-made electrochemical reactor,the effects of the Fe3 ＋concentration Cl-concentration,current density and on the decolorization rate of methyl orange were investigated through the experiment of methyl orange degradation in water by electrochemical method for the interaction of cathode and anode. And the reaction products were qualitatively analyzed by ultraviolet-visible spectrum. The anode with titanium based iridium coating had good chemical stability,high catalytic performance and high electrode potential. The cathode which was made of titanium plate had high hydrogen evolution potential. When the concentration of Fe3 ＋is 1 mmol / L 、the concentration ofCl- 11 mmol / L 、the current density 7. 5 m A / cm2,the decolorization rate of methyl orange could reach more than 90%. M ethyl orange can be decolorized at the same time role of cathode and anode. n-π＊structures of azo benzene and conjugated π-π＊structures of methyl orange were destroyed. The treatment effect of methyl orange through electrochemical method for the same time role of cathode and anode is better.