利用电化学氧化技术在泡沫铜基底上生长出纳米线，再进行退火氧化处理，使其具备高催化还原硝酸盐的性能。实验结果表明，该三维铜电极的比表面积高、传质效果好；用适度氧化后的电极以15 mA/cm²的电流密度，在120 min内基本上可将pH=7的水体中存在的30 mg N/L硝酸盐去除（去除率为99%）；为了将生成的氨氮副产物去除，加入NaCl还原120 min，硝酸盐的去除率达91%，氮气选择性高于95%。5次循环实验后硝酸盐的去除率保持在91%~95%，氮气选择性为93%~95%。该材料与工艺的结合解决了水体中硝酸盐的污染问题，为实际水体污染提供了新的解决方案。

Nanowires grow on the foamed copper substrate by electrochemical oxidation technology, and is then treated through annealing oxidation to obtain high performance in catalytic reduction of nitrates.Experimental results show that the prepared three-dimensional copper electrode possesses high specific surface area and good mass transfer effect.The 30 mg N·L^-1 nitrates in the water with a pH of 7 can be completely removed within 120 minutes by using the moderately oxidized electrode at a current density of 15 mA·cm^-2, representing a removal rate of 99%.In order to remove the generated ammoniacal nitrogen by-product, the water again has been reduced by NaCl for 120 minutes, the removal rate of nitrates reaches 91% and the selectivity of nitrogenous gas is higher than 95%.The removal rate of nitrates remains basically around 91%-95% and nitrogen selectivity remains 93%-95% after five cycles of experiments.The combination of the material and the process solves the problem of nitrates pollution in water and provides a new solution for treating with actual water pollution.

吴勇立(1995-),男,硕士研究生,研究方向为环境电化学方向,991687809@qq.com