研究了不同制备条件下的碳量子点（CQDs）修饰碳毡电极对微生物挂膜及硝酸盐氮（NO₃^--N）催化还原性能的影响。通过扫描电镜（SEM）和电化学测试方法对其进行测试，结果表明，CQDs质量浓度为14.4 g/L、碳化时间为24 h时，风干干燥方法制备的CQDs修饰电极具有较大的比表面积和良好的挂膜能力；循环伏安曲线分析结果表明，NO₃^-离子还原峰位于-0.785~-0.663 V之间，峰值电位和峰值电流较大，NO₃^--N的还原性能更强，同时交流阻抗谱也体现了该工况下较小的电荷转移内阻，均为10~18 Ω之间。因此，使用CQDs修饰可以提升MFC生物阴极的挂膜能力及NO₃^--N的催化还原性能。

The effects of carbon quantum dots (CQDs)-modified carbon felt electrodes prepared under different conditions on the microbial film formation performance of the electrodes and their catalytic reduction performance for nitrogen in nitrate (NO₃^--N) are investigated.It is indicated through scanning electron microscopy (SEM) and electrochemical test methods that the CQDs modified electrode prepared via air-drying method with a CQDs concentration of 14.44 g·L^-1 and a carbonization time of 24 h has a large specific surface area and a good film formation ability.Through cyclic voltammetric curve analysis, it is shown that the reduction peak for NO₃^- ion locates between -0.785 V and -0.663 V, with larger peak potential and current.The electrode exhibits a stronger reduction performance to NO₃^--N, while the AC impedance spectrum also reflects the smaller internal resistance of charge transfer under this working condition, all in the range of 10^-18 Ω.Therefore, the modification with CQDs can enhance the film formation ability of MFC biocathode and its catalytic reduction performance for NO₃^--N.