Electrochemical removal of nitrate in high-salt wastewater with low-cost iron electrode modified by phosphate.
J Environ Sci (China)
; 148: 38-45, 2025 Feb.
Article
de En
| MEDLINE
| ID: mdl-39095173
ABSTRACT
Nitrate (NO3-) is a widespread pollutant in high-salt wastewater and causes serious harm to human health. Although electrochemical removal of nitrate has been demonstrated to be a promising treatment method, the development of low-cost electro-catalysts is still challenging. In this work, a phosphate modified iron (P-Fe) cathode was prepared for electrochemical removal of nitrate in high-salt wastewater. The phosphate modification greatly improved the activity of iron, and the removal rate of nitrate on P-Fe was three times higher than that on Fe electrode. Further experiments and density functional theory (DFT) calculations demonstrated that the modification of phosphoric acid improved the stability and the activity of the zero-valent iron electrode effectively for NO3- removal. The nitrate was firstly electrochemically reduced to ammonium, and then reacted with the anodic generated hypochlorite to N2. In this study, a strategy was developed to improve the activity and stability of metal electrode for NO3- removal, which opened up a new field for the efficient reduction of NO3- removal by metal electrode materials.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Phosphates
/
Polluants chimiques de l'eau
/
Élimination des déchets liquides
/
Électrodes
/
Eaux usées
/
Fer
/
Nitrates
Langue:
En
Journal:
J Environ Sci (China)
Sujet du journal:
SAUDE AMBIENTAL
Année:
2025
Type de document:
Article
Pays d'affiliation:
Chine