论文部分内容阅读
采用PbO2/Ti和IrO2-Ta2O5/Ti电极对酸性橙7(AO7)模拟废水进行了电解处理实验研究。考察了2种电极上不同电流密度条件下AO7的去除率、反应动力学、COD去除效果及瞬时电流效率,结果表明,在相同条件下,PbO2/Ti电极表现出更好的处理效率、更适合用于AO7的矿化。循环伏安(CV)曲线表明,PbO2/Ti电极具有更高的析氧电位且在AO7电解液中出现了氧化峰,说明PbO2/Ti电极对AO7具有更好的催化活性和直接氧化能力。紫外可见光谱对比分析表明,IrO2-Ta2O5/Ti电极对AO7的结构破坏速度缓慢且伴随苯胺等中间产物产生,对AO7的矿化程度弱。对比结果说明PbO2/Ti电极更适合于偶氮类染料废水的电催化氧化处理。
The electrolytic treatment of acid orange 7 (AO7) simulated wastewater with PbO2 / Ti and IrO2-Ta2O5 / Ti electrodes was studied. The removal efficiency, reaction kinetics, COD removal efficiency and instantaneous current efficiency of AO7 under different current densities of the two kinds of electrodes were investigated. The results show that the PbO2 / Ti electrode shows better processing efficiency under the same conditions and is more suitable For the mineralization of AO7. Cyclic voltammetry (CV) curves show that the PbO2 / Ti electrode has a higher oxygen evolution potential and an oxidation peak appears in the AO7 electrolyte, indicating that the PbO2 / Ti electrode has better catalytic activity and direct oxidation capability to AO7. Comparative analysis of UV-visible spectrum shows that the structure of AO7 is destroyed slowly by IrO2-Ta2O5 / Ti electrode and accompanied by the production of aniline and other intermediate products, and the mineralization of AO7 is weak. The comparison results show that PbO2 / Ti electrode is more suitable for the electrocatalytic oxidation of azo dye wastewater.