Method for preparing Fe3O4@ZrO(OH)2 magnetic nano-adsorbing material for high-efficient fluoride removal from drinking water

The invention discloses a method for preparing an Fe3O4@ZrO(OH)2 magnetic nano-adsorbing material for high-efficient fluoride removal from drinking water. The method comprises the following steps: (1) preparing magnetic nano-Fe3O4 microspheres by using a coprecipitation method; and (2) adding the magnetic nano-Fe3O4 microspheres and deionized water into a reaction vessel; adding a certain amount of solution of zirconium salt dropwise into the reaction vessel under the condition of mechanical stirring; adding the solution of NaOH into the reaction vessel dropwise; and separating and washing by utilizing an externally-applied magnetic field after heating, refluxing and reacting for 1 to 3 hours so as to obtain the magnetic nano-Fe3O4@ZrO(OH)2 composite microspheres. The method has the following advantages that: 1, adsorption capacity is large, so the method is suitable for advanced treatment of large volume of drinking water; 2, the removal speed is high, and the adsorption paths of nano-particles are short; and 3, the preparation is simple because the overall preparation process has no need of complex reaction process, special reaction equipment or harsh reaction temperature, the operation is simple and easy to implement, and the reproducibility is high.