Electrochemical removal of nitrate in high-salt wastewater with low-cost iron electrode modified by phosphate  

作　　者：Fengjiao Quan Guangming Zhan Pengfei Xu Xiaolan Chen Wenjuan Shen Falong Jia Yun He Jianfen Li 

机构地区：[1]College of Chemical and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China [2]College of Chemistry,Central China Normal University,Wuhan 430079,China [3]School of Environmental Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Environmental Sciences》2025年第2期38-45,共8页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China (No.22176068);the Research and Innovation Initiatives of WHPU (No.2022J03),the Hubei Provincial Natural Science Foundation (No.2023AFB938);the Scientific research project of Education Department of Hubei Province (No.D20221610).

摘　　要：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 NO_(3)^(-) removal.The nitrate was firstly electrochemically reduced to ammonium,and then reacted with the anodic generated hypochlorite to N_(2).In this study,a strategy was developed to improve the activity and stability of metal electrode for NO_(3)^(-)removal,which opened up a new field for the efficient reduction of NO3-removal by metal electrode materials.

关 键 词：Nitrate removal High-salt wastewater ELECTROCATALYSIS Phosphate modified Iron 

分 类 号：X70[环境科学与工程—环境工程]