钴铁层状双金属负载生物炭对水体硝氮的吸附研究OACSTPCD

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.