硝酸盐
化学
亚硝酸盐
无机化学
催化作用
电化学
活性炭
流出物
阴极
钯
电极
核化学
环境工程
有机化学
吸附
物理化学
工程类
作者
Thiago Favarini Beltrame,Fernanda Miranda Zoppas,Maria Carolina Sérgi Gomes,Jane Zoppas Ferreira,Fernanda Albana Marchesini,Andréa Moura Bernardes
出处
期刊:Chemosphere
[Elsevier]
日期:2021-09-01
卷期号:279: 130832-130832
被引量:14
标识
DOI:10.1016/j.chemosphere.2021.130832
摘要
Contamination of water by nitrate has become a worldwide problem, being high levels of this ion detected in the surface, and groundwater, mainly due to the intensive use of fertilizers, and to the discharge of not properly treated effluents. This study aims to evaluate the electrocatalytic process, carried out in a cell divided into two compartments by a cation exchange membrane, and with a copper plate electrode as cathode, identifying the effects of current density, pH, the use of a catalyst in the nitrate reduction, and the production of gaseous compounds. The highest nitrate reduction was obtained with a current density of 2.0 mA cm−2, without pH adjustment and, in this condition, nitrite ion was mainly formed. The application of activated carbon fibers with palladium (1% wt. and 3% wt.) in an alkaline medium presented an increase in gaseous compounds formation. With 2.0 mA cm−2, pH adjustment, and applying 3% wt. Pd catalyst, the highest selectivity to gaseous compounds was obtained (95%) with no nitrite detection. These results highlight the viability of using the process developed at this work for the treatment of nitrate contaminated waters.
科研通智能强力驱动
Strongly Powered by AbleSci AI