光电催化氧化法脱色处理刚果红染料废水

采用阴极还原法制备了泡沫镍负载纳米ZnO（ZnO/Ni）电极，采用SEM和XRD技术对ZnO/Ni电极进行了表征。以高压汞灯为光源，ZnO/Ni电极为阳极，铂电极为阴极，对模拟刚果红染料废水进行了光电催化脱色处理。考察了催化工艺、电解质种类及浓度、初始废水pH和反应温度等因素对刚果红降解率的影响。表征结果显示， 制备的纳米ZnO呈六方晶系结构，平均粒径为23.6 nm。实验结果表明，当外加电流为1.0 mA时，在初始刚果红质量浓度为30 mg/L、电解质Na₂SO₄浓度为0.050 mol/L、初始废水pH为5、反应温度为50 ℃的条件下，光电催化反应60 min后，刚果红降解率为86.36%，COD和色度的去除率分别达到70.56%和92.86%。

Decolorization of Dye Wastewater Containing Congo Red by Photoelectrocatalytic Oxidation Process

The porous nickel supported nano-ZnO electrode （ZnO/Ni） was prepared by cathodic reduction method and characterized by SEM and XRD. The simulated Congo red containing dye wastewater was treated by photoelectrocatalysis using high pressure mercury lamp as light source,ZnO/Ni as anode and Pt wire as cathode. The factors affecting the Congo red degradation rate were studied. The characterization results show that the structure of the prepared nano-ZnO is the hexagonal system and the average particle size is 23.6 nm. The experimental results show that：When the impressed current is 1.0 mA and under the conditions of initial Congo red mass concentration 30 mg/L,electrolyte Na₂SO₄ concentration 0.050 mol/L,initial wastewater pH 5,reaction temperature 50 ℃ and reaction time 60 min,the degradation rate of Congo red is 86.36%,the removal rates of COD and chroma are 70.56% and 92.86% respectively.