Efficient adsorption of aflatoxin B-1 from water with a reusable magnetic covalent organic framework

BACKGROUND Aflatoxin B-1 (AFB(1)) is the most toxic and harmful aflatoxin, and has good thermal stability. Research reveals that AFB(1) also exists in water, which is potentially harmful to human health. Therefore, it is urgent to remove AFB(1) from water. In this work, a novel magnetic covalent organic framework composite (Fe3O4@COFs) is synthesized. RESULTS The specific surface area is as high as 1293.32 m(2) g(-1). The adsorption capacity for AFB(1) is 420 mu g mg(-1), which is six times or more that of other adsorbents. Fe3O4@COFs is employed for the adsorption and elimination of AFB(1) from water. The removal efficiency is above 90% and it can be reused at least eight times. In addition, Fe3O4@COFs has been successfully used to remove trace AFB(1) in actual water samples. CONCLUSIONS The synthesized Fe3O4@COFs has good thermal stability, fast adsorption and large adsorption capacity, and can be recycled many times. Fe3O4@COFs exhibits excellent performance for the removal of AFB(1), and has exceptional promise for application in water purification.