Rising levels of nitrate and nitrogen in water bodies pose a potential threat to aquatic ecosystems and human health. Therefore, it is urgent to solve the problem of excessive nitrate in water bodies. Fe(NO3)3·9H2O, Co(NO3)2·6H2O, reed biochar, NH3·H2O was used as raw material, and co?precipitation method was used to load cobalt?iron layered bimetals onto reed biochar to prepare Co/Fe?LDH@BC for adsorption of excess nitrate nitrogen in water. The experimental results showed that Co/Fe?LDH@BC could effectively adsorb nitrate nitrogen in water, and its adsorption capacity was 88.52 mg/g. The adsorption kinetic model conforms to the pseudo?second?order kinetic model, and the isotherm conforms to the Langmuir isotherm model, indicating that the adsorption reaction is spontaneous and endothermic, which mainly involves four reaction mechanisms: ion exchange, ligand exchange, electrostatic attraction and hydrogen bonding. In addition, Co/Fe?LDH@BC has a strong affinity for nitrate nitrogen in most water bodies where coexisting anions are present, making it suitable for practical applications.
