直接电解法处理染料废水的研究

Study on dye wastewater treatment using the direct electrolysis method

实验以Ti为基体 ,分别采用热分解法和阳极电沉积法制备了SnO2 和PbO2 电极。用XRD、SEM、XPS和稳态极化、循环伏安法分别对上述电极进行结构特性表征和电化学特性检测。实验结果表明 ,在相同工作条件下 ,SnO2 电极的析氧电势比PbO2 电极高 30 0～ 5 0 0mV ,且其作为阳极降解的直接染料 (直接橙S和直接耐晒黑G)模拟废水COD值下降速度快。在模拟染料废水处理体系中 ,提高反应温度有利于染料的降解。SnO2 电极阳极氧化染料溶液过程中 ,能定性检测到降解产物———CO2 。

The SnO 2 electrode and the PbO 2 electrode have been prepared respectively by the thermal decomposition and electrodeposition on Ti substrates. The structure characteristics of the two electrodes have been studied by means of XRD?SEM?XPS and their electrochemical behaviours have been investigated by the steady state polarization and cyclic voltammetry method. The results of the experiment show that the potential for oxygen evolution on the SnO 2 electrode is 300～500 mV higher than that on the PbO 2 electrode. The values of the chemical oxygen demand(COD) in the degraded direct dyes(direct orange S and direct fast light black G) simulated wastewater by the SnO 2 anode decrease fast. In the simulated dye wastewater′s treating system, increasing reaction temperature benefit to the dyes′ degradation. In the processing that the dye wastewater is electrooxided by the SnO 2 anode, the degraded product of the dye wastewater--CO 2 has been detected qualitatively.