通过电沉积法和高温煅烧法相结合制备了Co₃O₄/Cu电极,优化了电极制备条件(电沉积时间、煅烧温度),并利用EDS、SEM和XRD对其进行表征。考察了NO₃^--N初始质量浓度、溶液初始pH、电流密度和Cl^-质量浓度对硝酸根还原的影响。结果表明,电沉积10 min并在500℃下煅烧的Co₃O₄电极具有较大的比表面积、良好的结晶度和高催化活性。在NO₃^--N质量浓度为50 mg/L、Cl^-质量浓度为500 mg/L、电流密度为10 mA/cm²、溶液初始pH=7的条件下电解60 min,NO₃^--N还原率、NH₄⁺-N生成率和总氮(TN)去除率分别为87.6%、34.7%和52.8%。

Co₃O₄/Cu electrode is prepared via electrodeposition and high temperature calcination.The preparation conditions,such as electrodeposition time and calcination temperature,are optimized.The prepared electrodes are characterized by EDS,SEM and XRD.The influencing parameters for the reduction of nitrate are investigated,including NO₃^--N initial concentration,initial pH of solution,current density,and Cl^- concentration.It is verified that the CO₃O₄ electrode prepared under 10 min of electrodeposition and subsequent carbonization at 500℃ possesses a large specific surface area,good crystallinity and high catalytic activity.The electrolytic conditions are optimized and determined as follows:the mass concentration of NO₃^--N is 50 mg·L^-1,the mass concentration of Cl^- is 500 mg·L^-1,the current density is 10 mA·cm^-2,and the initial pH of solution is 7.The reduction rate of NO₃^--N,the generation rate of NH₄⁺-N and the removal of total nitrogen are 87.6%,34.7% and 52.8% respectively after the electrolysis has performed for 60 min under the optimal conditions.

李德慧(1995-),女,硕士研究生,研究方向为电化学反硝化,dhli2034@163.com。