Ni foam/Cu电极电催化还原硝酸盐氮  

Electrocatalytic reduction of nitrate nitrogen by Ni foam/Cu electrode

作　　者：郭睿 秦侠[1] 郭城睿 李明然 吕悦 GUO Rui;QIN Xia;GUO Chengrui;LI Mingran;LYU Yue(Department of Environment and Life Sciences,Beijing University of Technology,Beijing,100124,China)

机构地区：[1]北京工业大学环境与生命学部,北京100124

出　　处：《环境化学》2022年第6期2103-2111,共9页Environmental Chemistry

基　　金：国家自然科学基金(51778014)资助.

摘　　要：采用恒流电沉积法制备了泡沫镍/铜(Ni foam/Cu)电极.以Ni foam/Cu电极为阴极、Ti/RuO_(2)-Ir_(2)O_(3)电极为阳极构建电解体系,对水中硝酸盐氮进行电催化还原处理.并研究了电解质对总氮和氨氮去除率的影响和电极的稳定性.在一定范围内,增大电解质NaCl的浓度可以提高总氮和氨氮去除率.当NaCl浓度为0.5 g·L^(-1)时,在电解电流密度为8 mA·cm^(-2)的条件下对100 mg·L^(-1) NO_(3)^(-)-N溶液进行6次重复电解实验,2.5 h后硝酸盐氮去除率均可以达到94.5%以上.当NaCl浓度为1.25 g·L^(-1)时,在电解电流密度为8 mA·cm^(-2)的条件下对100 mg·L^(-1) NO_(3)^(-)-N溶液电解2.5 h,出水中氨氮浓度只有2.90 mg·L^(-1),总氮去除率达到79.47%.实验结果表明,Nifoam/Cu阴极具有较高的电催化还原活性和良好的稳定性.The Ni foam/Cu electrode was prepared by galvanostatic electrodeposition method.The Ni foam/Cu and the Ti/RuO_(2)-Ir_(2)O_(3) electrode were used as the cathode and anode respectively to construct an electrolysis system to perform electrocatalytic reduction of nitrate nitrogen in water.The effect of the electrolyte on the removal rate of total nitrogen and ammonia nitrogen and the stability of the electrode were also investigated.In a certain range,the removal rate of total nitrogen and ammonia nitrogen can be improved by increasing the electrolyte NaCl concentration.When the concentration of electrolyte NaCl increased to 0.5 g·L^(-1),six repeated electrolysis experiments were performed in 100 mg·L^(-1) NO_(3)^(-)-N solution for 2.5 h under the condition of 8 mA·cm^(-2),and the removal rate of nitrate nitrogen could reach more than 94.5%.When the concentration of electrolyte NaCl increased to 1.25 g·L^(-1),the concentration of ammonia nitrogen was only 2.90 mg·L^(-1) after 2.5 h of electrolysis under the condition of 8 mA·cm^(-2).and the total nitrogen removal rate reached 79.47%.The experimental results show that the Ni foam/Cu cathode has high electrocatalytic reduction activity and good stability.

关 键 词：硝酸盐氮 电催化还原 泡沫镍/铜 

分 类 号：X703[环境科学与工程—环境工程]