The research of steady-state electrochemical kinetics of effective and selective conversion of total nitrogen to N-2
The research of steady-state electrochemical kinetics of effective and selective conversion of total nitrogen to N-2
复制标题
全氮有效选择性转化为N-2的稳态电化学动力学研究
DOI：
10.1007/s11356-019-05476-5
复制
发表时间：
2019
影响因子：
5.8
通讯作者：
Wang Jade
中科院分区：
文献类型：
--
作者：
Ye Zhiping;Shen Ruxue;Zhou Xule;Yao Jachao;Wang Jade
无机氮形式的电化学转化（即，以Ti为阴极，Ti/PbO 2为阳极，研究了模拟废水中NO3--N、NO2--N和NH 4 +-N的氧化还原反应。根据线性扫描伏安法，在工作电位比-1.1 V（vs. SCE）更负的条件下，在Ti阴极上，硝酸氮被有效地转化为N2。Ti/PbO 2阳极的NH 4 +-N转化为N2的工作电位为+0.8 V（vs. SCE）。NO3−-N转化为NO2−-N和NO2−-N转化为N2的表观速率常数分别为2.46 × 10− 2 min − 1和4.03 × 10− 2 min −1。动力学分析表明，NO3--N的还原是一个两步反应过程，NO2--N是一个不稳定的中间体，容易被氧化为NO3--N或还原为NH 4 +-N.绝大部分NH 4 +-N在Ti/PbO 2阳极上可有效转化为N2，表观速率常数为5.12 × 10− 2 min −1。采用循环双室（DC）反应器对模拟废水和实际废水进行间歇电解。结果验证了NH 4 +-N氧化和NO3−-N还原的途径，并实现了总氮（TN）向N2的高转化率。
The electrochemical conversion of inorganic nitrogen forms (i.e., NO3−-N, NO2−-N, and NH4+-N) to N2was studied using Ti as cathode and Ti/PbO2as anode in the simulated wastewater. According to linear sweep voltammetry, nitric nitrogen was effectively converted to N2on Ti cathode at the working potential more negative than − 1.1 V (vs. SCE). Ti/PbO2anode had the working potential of + 0.8 V (vs. SCE) for NH4+-N converted to N2. The apparent rate constants of NO3−-N to NO2−-N and NO2−-N to N2were 2.46 × 10−2min−1and 4.03 × 10−2min−1, respectively. The kinetic analyses revealed that the reduction of NO3−-N was a two-step process, and NO2−-N was an unstable intermediate, which could be easily oxidized to NO3−-N or reduced to NH4+-N. The majority of NH4+-N could be effectively converted to N2on Ti/PbO2anode with the apparent rate constants of 5.12 × 10−2min−1. The dual-chamber (DC) reactor with circulation was used in the batch electrolysis of simulated and actual wastewater. The results verified the pathways of NH4+-N oxidation and NO3−-N reduction and achieved high conversion rate of total nitrogen (TN) to N2.