当前位置：
X-MOL 学术
›
Environ. Sci. Technol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Electrochemical Reduction of Nitrate with Simultaneous Ammonia Recovery Using a Flow Cathode Reactor
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-11-17 , DOI: 10.1021/acs.est.2c06033 Jingyi Sun 1 , Shikha Garg 1 , Jiangzhou Xie 1, 2 , Changyong Zhang 1 , T David Waite 1, 2
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-11-17 , DOI: 10.1021/acs.est.2c06033 Jingyi Sun 1 , Shikha Garg 1 , Jiangzhou Xie 1, 2 , Changyong Zhang 1 , T David Waite 1, 2
Affiliation
|
The presence of excessive concentrations of nitrate in industrial wastewaters, agricultural runoff, and some groundwaters constitutes a serious issue for both environmental and human health. As a result, there is considerable interest in the possibility of converting nitrate to the valuable product ammonia by electrochemical means. In this work, we demonstrate the efficacy of a novel flow cathode system coupled with ammonia stripping for effective nitrate removal and ammonia generation and recovery. A copper-loaded activated carbon slurry (Cu@AC), made by a simple, low-cost wet impregnation method, is used as the flow cathode in this novel electrochemical reactor. Use of a 3 wt % Cu@AC suspension at an applied current density of 20 mA cm–2 resulted in almost complete nitrate removal, with 97% of the nitrate reduced to ammonia and 70% of the ammonia recovered in the acid-receiving chamber. A mathematical kinetic model was developed that satisfactorily describes the kinetics and mechanism of the overall nitrate electroreduction process. Minimal loss of Cu to solution and maintenance of nitrate removal performance over extended use of Cu@AC flow electrode augers well for long-term use of this technology. Overall, this study sheds light on an efficient, low-cost water treatment technology for simultaneous nitrate removal and ammonia generation and recovery.
中文翻译：
使用流动阴极反应器电化学还原硝酸盐并同时回收氨
工业废水、农业径流和一些地下水中硝酸盐浓度过高对环境和人类健康构成严重问题。因此，人们对通过电化学方法将硝酸盐转化为有价值的产品氨的可能性产生了相当大的兴趣。在这项工作中，我们展示了一种新型流动阴极系统与氨汽提相结合以有效去除硝酸盐以及氨气生成和回收的功效。通过简单、低成本的湿法浸渍法制成的载铜活性炭浆料 (Cu@AC) 被用作这种新型电化学反应器中的流动阴极。在 20 mA cm –2的施加电流密度下使用 3 wt% Cu@AC 悬浮液结果硝酸盐几乎完全去除，97% 的硝酸盐还原为氨，70% 的氨在酸接收室中回收。开发了一个数学动力学模型，该模型令人满意地描述了整个硝酸盐电还原过程的动力学和机理。长期使用 Cu@AC 流电极螺旋钻可以很好地减少溶液中铜的损失并保持硝酸盐去除性能，以便长期使用该技术。总的来说，这项研究揭示了一种高效、低成本的水处理技术，可同时去除硝酸盐以及氨气的生成和回收。
更新日期：2022-11-17
中文翻译：
使用流动阴极反应器电化学还原硝酸盐并同时回收氨
工业废水、农业径流和一些地下水中硝酸盐浓度过高对环境和人类健康构成严重问题。因此，人们对通过电化学方法将硝酸盐转化为有价值的产品氨的可能性产生了相当大的兴趣。在这项工作中，我们展示了一种新型流动阴极系统与氨汽提相结合以有效去除硝酸盐以及氨气生成和回收的功效。通过简单、低成本的湿法浸渍法制成的载铜活性炭浆料 (Cu@AC) 被用作这种新型电化学反应器中的流动阴极。在 20 mA cm –2的施加电流密度下使用 3 wt% Cu@AC 悬浮液结果硝酸盐几乎完全去除，97% 的硝酸盐还原为氨，70% 的氨在酸接收室中回收。开发了一个数学动力学模型，该模型令人满意地描述了整个硝酸盐电还原过程的动力学和机理。长期使用 Cu@AC 流电极螺旋钻可以很好地减少溶液中铜的损失并保持硝酸盐去除性能，以便长期使用该技术。总的来说，这项研究揭示了一种高效、低成本的水处理技术，可同时去除硝酸盐以及氨气的生成和回收。
京公网安备 11010802027423号