钴卟啉催化硝酸盐电化学还原反应

Nitrate Electrochemical Reduction Catalyzed by Cobalt Protoporphyrin

利用电化学还原技术,不仅可以降低水中硝酸盐的含量,还可以产生羟胺等重要的化工原料.本文以钴卟啉作为催化剂催化硝酸盐电化学还原反应,探索硝酸盐浓度和pH值对该反应的影响.研究表明,该硝酸盐还原反应高度依赖于反应体系的pH值.当pH值由1升高到2时,反应在很大程度上被抑制了;同时,当pH值一定时,硝酸盐的浓度成为影响该反应的另一主要因素;当pH=1时,硝酸盐浓度降低一个数量级,NH3OH^+和NH4^+的生成浓度大大降低;而当pH值进一步升高时,硝酸盐浓度的影响基本可以忽略.基于以上的结果,我们分析并初步探讨了硝酸盐还原反应的反应机理.

The electrochemical reduction of nitrate technology can not only reduce the nitrate content in groundwater,but also produce important chemical raw materials,such as hydroxylamine.Cobalt porphyrin was used as catalyst to catalyze electrochemical reduction of nitrate,and the effects of nitrate concentration and pH value on the reaction were explored.The results showed that the reaction is highly dependent on the pH value of the reaction system.When the pH value increased from 1 to 2,the nitrate reduction reaction is inhibited to a large extent.At the same time,it is found that nitrate concentration is another major factor affecting the reaction at a certain pH value.At pH=1,when nitrate concentration decreases by an order of magnitude,the concentration NH3OH^+ and NH4^+ formed from nitrate reduction decreases greatly.When the pH is further increased,the effect of nitrate concentration can be neglected.Based on the above discussions,the possible pathways of the electrochemical reduction of nitrate is map out and the mechanism briefly is discussed.