PbO2电极的改性及非均相电催化氧化废水中的硝基苯

使用热分解 电镀法制备Ti基PbO₂电极（Ti/PbO₂）、 F^-掺杂Ti基PbO₂电极（Ti/F-PbO₂）和F^-，La³⁺共掺杂Ti基PbO₂电极（Ti/F-La-PbO₂）, 并通过扫描电镜(SEM)表征Ti/F-PbO₂电极和Ti/PbO₂电极的表面结构, 用X射线衍射(XRD)测试分析Ti/PbO₂电极、 Ti/F-PbO₂电极和Ti/F-La-PbO₂电极的晶相. 通过加速电解寿命和电催化降解废水中硝基苯的实验, 研究F-掺杂和F^-,La^3+共掺杂对PbO₂电极稳定性及电催化活性的影响. 使用SEM和XRD测试分析了Fe³⁺/MgO的表面结构及晶型, 并将自制Fe³⁺/MgO催化剂应用于电催化处理废水中硝基苯的实验体系, 探讨了电解体系中相关因素和催化剂用量对废水中硝基苯及化学耗氧量(COD)去除率的影响. 结果表明:  La³⁺掺杂使电极镀膜表面晶粒细化; 不同掺杂均影响晶体生长的晶面取向; F^-掺杂提高了PbO₂阳极的电解寿命; La³⁺掺杂改善了PbO₂电极的导电性能; Ti/F-La-PbO₂电极的电催化降解活性显著提高; 在电解体系中, 催化剂显著提高了电解反应速率和COD及废水中硝基苯的去除率; 硝基苯的降解符合一级反应动力学.

Modification of PbO2 Electrode and the Treatment of NitrobenzeneWastewater by Heterogeneous Catalysts and Electrode Oxidation

We prepared Ti/PbO₂, Ti/F-PbO₂ and Ti/F-La-PbO₂ electrodes with thermal decomposition plating method and analyzed the surface morphology and phase of Ti/PbO₂, Ti/F-PbO₂ and Ti/F-La-PbO₂ electrodes with SEM and XRD. With the experiment of accelerating electrolytic life and oxidizing nitrobenzene in wastewater, we researched the influences of stability andelectric catalytic activity of PbO₂ electrodes with F doping and F^- and La³⁺ co-doping. SEM and XRD were used to analyze the surface structure and crystaltype of Fe³⁺/MgO. The catalyst was added in the electric catalytic oxi
dation system to test the influence of the relevant factors on degradation of COD and NB in the wastewater. The experimental results show that comparedwith undoped Ti/PbO₂ electrode, the incorporation of La³⁺ made the electrode coating surface grain refinement. Different doping produces certain effectson growth orientation of crystal. F doping significantly raised electrolytic life of PbO₂ anode. La³⁺doping improved the conductive performance. Compared with those of Ti/PbO₂, Ti/F PbO₂ electrode, electrical catalytic degradation activity of the Ti/F-La-PbO₂ electrode increased significantly. In the electrolytic system, the catalyst added significantly improved the electrolytic reaction rate, COD and nitrobenzene degradations. The degradation of nitrobenzene fit the pseudo first order reaction kinetics in the amount of thecatalyst.