Preparation method for amino composite magnetic nano bacteria remover

The invention relates to a preparation method for an amino composite magnetic nano bacteria remover. The method includes the steps: S1, stirring a ferric salt and a ferrous salt with the molar equivalent ratio of 2:0.85, adding the mixture into an 80 DEG C oxygen-free water, making the pH of the system reach 10, and synthesizing a magnetic nano material by a hydrothermal coprecipitation method; S2, cleaning the magnetic nano material until the pH is 7; S3, adding the neutral magnetic nano material to a 0.08 mol/L quaternary ammonia type cationic surfactant solution, carrying out ultrasonic treatment for 30 minutes, and attaching the quaternary ammonium type cationic surfactant to the surface of the magnetic nano material; S4, washing away the quaternary ammonium type cationic surfactant unloaded on the magnetic nano material; and S5, separating the magnetic nano material loaded with the quaternary ammonium type cationic surfactant, and carrying out vacuum drying for 12 hours at the temperature of 80 DEG C. Th