Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation

This work aims to present different electroreduction and electrocatalytic processes configurations to treat nitrate contaminated water. The parameters tested were: current density, cell potential, electrode potential, pH values, cell type and catalyst use. It was found that the nitrite ion is presen...

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Autores principales:	T. F. Beltrame, F. M. Zoppas, J. Z. Ferreira, F. A. Marchesini, A. M. Bernardes
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	copper electrode electrocatalysis electroreduction nitrate reduction operational parameters pd catalyst Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/dad32a7b177a4b219857f264b6ab60e1
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spelling	oai:doaj.org-article:dad32a7b177a4b219857f264b6ab60e12021-11-06T11:11:56ZNitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation0273-12231996-973210.2166/wst.2021.215https://doaj.org/article/dad32a7b177a4b219857f264b6ab60e12021-07-01T00:00:00Zhttp://wst.iwaponline.com/content/84/1/200https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732This work aims to present different electroreduction and electrocatalytic processes configurations to treat nitrate contaminated water. The parameters tested were: current density, cell potential, electrode potential, pH values, cell type and catalyst use. It was found that the nitrite ion is present in all process variations used, being the resulting nitrite concentration higher in an alkaline pH. The increase in current density on galvanostatic operation mode provides a greater reduction of nitrate (64%, 1.4 mA cm−2) if compared to the potentiostatic (20%) and constant cell potential (37%) configurations. In a dual-chamber cell the nitrate reduction with current density of 1.4 mA cm−2 was tested and obtained as a NO3− reduction of 85%. The use of single chamber cell presented 32 ± 3% of nitrate reduction, indicating that in this cell type the nitrate reduction is smaller than in dual-chamber cell (64%). The presence of a Pd catalyst with 3.1% wt. decreased the nitrite (1.0 N-mg L−1) and increased the gaseous compounds (9.4 N-mg L−1) formation. The best configuration showed that, by fixing the current density, the highest nitrate reduction is obtained and the pH presents a significant influence during the tests. The use of the catalyst decreased the nitrite and enhanced the gaseous compounds formation. Highlights Electroreduction can be used to treat contaminated water with a high nitrate concentration.; Galvanostatic mode promotes a high nitrate reduction.; Increase in current density improves the nitrate reduction.; The Pd catalyst decreases the nitrite and increases the formation of the gaseous compounds.; This system does not need a catalyst separation stage of water after reaction.;T. F. BeltrameF. M. ZoppasJ. Z. FerreiraF. A. MarchesiniA. M. BernardesIWA Publishingarticlecopper electrodeelectrocatalysiselectroreductionnitrate reductionoperational parameterspd catalystEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 1, Pp 200-215 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	copper electrode electrocatalysis electroreduction nitrate reduction operational parameters pd catalyst Environmental technology. Sanitary engineering TD1-1066
spellingShingle	copper electrode electrocatalysis electroreduction nitrate reduction operational parameters pd catalyst Environmental technology. Sanitary engineering TD1-1066 T. F. Beltrame F. M. Zoppas J. Z. Ferreira F. A. Marchesini A. M. Bernardes Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation
description	This work aims to present different electroreduction and electrocatalytic processes configurations to treat nitrate contaminated water. The parameters tested were: current density, cell potential, electrode potential, pH values, cell type and catalyst use. It was found that the nitrite ion is present in all process variations used, being the resulting nitrite concentration higher in an alkaline pH. The increase in current density on galvanostatic operation mode provides a greater reduction of nitrate (64%, 1.4 mA cm−2) if compared to the potentiostatic (20%) and constant cell potential (37%) configurations. In a dual-chamber cell the nitrate reduction with current density of 1.4 mA cm−2 was tested and obtained as a NO3− reduction of 85%. The use of single chamber cell presented 32 ± 3% of nitrate reduction, indicating that in this cell type the nitrate reduction is smaller than in dual-chamber cell (64%). The presence of a Pd catalyst with 3.1% wt. decreased the nitrite (1.0 N-mg L−1) and increased the gaseous compounds (9.4 N-mg L−1) formation. The best configuration showed that, by fixing the current density, the highest nitrate reduction is obtained and the pH presents a significant influence during the tests. The use of the catalyst decreased the nitrite and enhanced the gaseous compounds formation. Highlights Electroreduction can be used to treat contaminated water with a high nitrate concentration.; Galvanostatic mode promotes a high nitrate reduction.; Increase in current density improves the nitrate reduction.; The Pd catalyst decreases the nitrite and increases the formation of the gaseous compounds.; This system does not need a catalyst separation stage of water after reaction.;
format	article
author	T. F. Beltrame F. M. Zoppas J. Z. Ferreira F. A. Marchesini A. M. Bernardes
author_facet	T. F. Beltrame F. M. Zoppas J. Z. Ferreira F. A. Marchesini A. M. Bernardes
author_sort	T. F. Beltrame
title	Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation
title_short	Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation
title_full	Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation
title_fullStr	Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation
title_full_unstemmed	Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation
title_sort	nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/dad32a7b177a4b219857f264b6ab60e1
work_keys_str_mv	AT tfbeltrame nitratereductionbyelectrochemicalprocessesusingcopperelectrodeevaluatingoperationalparametersaiminglownitriteformation AT fmzoppas nitratereductionbyelectrochemicalprocessesusingcopperelectrodeevaluatingoperationalparametersaiminglownitriteformation AT jzferreira nitratereductionbyelectrochemicalprocessesusingcopperelectrodeevaluatingoperationalparametersaiminglownitriteformation AT famarchesini nitratereductionbyelectrochemicalprocessesusingcopperelectrodeevaluatingoperationalparametersaiminglownitriteformation AT ambernardes nitratereductionbyelectrochemicalprocessesusingcopperelectrodeevaluatingoperationalparametersaiminglownitriteformation
_version_	1718443763359023104

Nitrate reduction by electrochemical processes using copper electrode: evaluating operational parameters aiming low nitrite formation

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