Magnetic chitosan/polydopamine aerogel as well as preparation method and application thereof

The invention provides magnetic chitosan/polydopamine aerogel. The magnetic chitosan/polydopamine aerogel is prepared from chitosan, polydopamine and magnetic ferroferric oxide nanoparticles according to the mass ratio of (1 to 10): (0.03 to 0.2): (1 to 10). The invention also provides a preparation method and application of the magnetic chitosan/polydopamine aerogel. The magnetic chitosan/polydopamine aerogel provided by the invention contains amino groups, and the amino groups are positively charged, so that micro-plastics such as PET (Polyethylene Terephthalate) with negative charges in a water environment can be effectively adsorbed, and the adsorption efficiency can reach 90% or above. Moreover, under the adhesion action of polydopamine, PET and other micro-plastics adsorbed to the surface of the aerogel are not easy to fall off, and secondary pollution is avoided. After adsorption is completed, due to the fact that magnetic ferroferric oxide nanoparticles are loaded on the surface of chitosan, aerogel c