| 电解催化还原-氯氧化无害化去除水中硝酸盐氮 |
| |
| 引用本文： | 胡筱敏,叶舒帆,和英滇,张 杨.电解催化还原-氯氧化无害化去除水中硝酸盐氮[J].环境科学研究,2011,24(5):533-539. |
| |
| 作者姓名： | 胡筱敏 叶舒帆 和英滇 张 杨 |
| |
| 作者单位： | 1.东北大学资源与土木工程学院, 辽宁 沈阳 110004 |
| |
| 基金项目： | 国家水体污染控制与治理科技重大专项 |
| |
| 摘 要： | 基于对Pd-Me双金属催化还原的机理分析，提出了以NH4+-N为目标产物，Fe催化还原NO3--N的理论设想. 结合折点氯化技术，以Ti/Fe为阴极，以Ti/Ir-Ru为阳极，以NaCl为支持电解质组建无隔膜电解体系，开展了水中NO3--N去除的试验研究. 结果表明，利用电解催化还原-氯氧化法可将模拟水样中NO3--N转化为N2去除，其反应历程为阴极催化还原NO3--N生成NH4+-N，阳极电解氯氧化NH4+-N生成N2. 在ρ(Cl-)为500 mg/L，电流密度为12 mA/cm2，极板距离为9 mm，搅拌强度为450 r/min的试验条件下电解150 min，初始ρ(NO3--N)为50 mg/L的模拟水样出水ρ(TN)和ρ(NO3--N)可分别降至2.9和2.8 mg/L，去除率分别达到94.1%和94.3%，NH4+-N和NO2--N均未检出. 分析认为，阴极对NO3--N的催化还原机理为:Fe化学吸附氮氧化合物离子中的O形成固定的N—O键，电解产生的活性还原物质攻击N—O形成N—H新键.
|
| 关 键 词： | NO3--N 催化还原 电解 NH4+-N 氯氧化 |
| 收稿时间： | 2010/8/25 0:00:00 |
| 修稿时间： | 2011/1/30 0:00:00 |
Harmless Removal of Nitrate-N in Water by Electrolysis Catalytic Reduction-Chlorine Oxidization |
| |
| HU Xiao-min,YE Shu-fan,HE Ying-dian and ZHANG Yang.Harmless Removal of Nitrate-N in Water by Electrolysis Catalytic Reduction-Chlorine Oxidization[J].Research of Environmental Sciences,2011,24(5):533-539. |
| |
| Authors: | HU Xiao-min YE Shu-fan HE Ying-dian and ZHANG Yang |
| |
| Affiliation: | 1.College of Resource and Civil Engineering, Northeastern University, Shenyang 110004, China2.College of Information Science and Engineering, Northeastern University, Shenyang 110004, China |
| |
| Abstract: | Based on analyzing the mechanism of the Pd-Me bimetal catalytic reduction, a theoretical assumption of reducing nitrate-N by Fe catalysis was presented, taking ammonia-N as the target product. Combined with break point chlorination technology, an experimental study was carried out on nitrate-N removal in water based on a septum-free electrolysis system, with Ti/Fe as the cathode, Ti/Ir-Ru as the anode and NaCl as the supporting electrolyte. The results showed that nitrate-N in the simulated water could be removed by transfer into nitrogen through the electrolysis catalytic reduction-chlorine oxidization method. The reaction course was as follows: nitrate-N was catalytically reduced to ammonia-N in the cathode, and ammonia-N was oxidized to nitrogen in the anode by electrolyzing chlorine. For simulation water with 50 mg/L initial nitrate-N, after 150 min electrolyzing at Cl- mass concentration of 500 mg/L, current density of 12 mA/cm2, plate distance of 9 mm and stirring intensity of 450 r/min, the total nitrogen and nitrate-N concentrations decreased to 2.9 mg/L and 2.8 mg/L, respectively, which represented removal rates of 94.1% and 94.3%, respectively. In addition, ammonia-N and nitrite-N were not detected. The mechanism of nitrate-N reduction in the cathode was analyzed to be related to Fe chemical adsorbing O in nitrogen-oxides ions to fix N—O bonds, then active reductant produced by electrolysis attacking N—O to form new N—H chemical bonds. |
| |
| Keywords: | nitrate-N catalytic reduction electrolysis ammonia-N chlorine oxidization |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《环境科学研究》浏览原始摘要信息 |
|
点击此处可从《环境科学研究》下载全文 |
|
