| abstract |
The invention discloses a magnetic adsorbent for removing silver nanoparticles and a preparation method thereof, belonging to the field of composite materials. The magnetic adsorbent material is a magnetic covalent organic framework, and melamine and terephthalaldehyde are coated on the surface of ferric iron tetroxide through Schiff base reaction. The preparation method of the invention is simple, and no catalyst is added. The magnetic adsorbent is rich in amino groups and the surface is positively charged, while the AgNPs solution in the sodium citrate stable solution is negatively charged. The adsorbent and AgNPs are electrostatically adsorbed and separated by an external magnetic field, which has a good adsorption effect and the process is convenient and fast . When the amount of adsorbent is 5 mg and the concentration of AgNPs is 10-80 mg/l, the removal rate is above 95%, and in the adsorption process, the magnetic adsorbent is easy to separate from the solution and is not easy to lose, the separation process is time-saving and efficient, and the adsorption Silver nanoparticles can be recycled and reused, and have broad application prospects in the adsorption of noble metals. |