Fe@SiO2 composite microsphere of bell structure as well as preparation method and application of composite microsphere

摘要: The invention belongs to the field of environmental nanometer materials and in particular relates a preparation method Fe@SiO2 composite microsphere bell structure. comprises following steps: 1, adding ferric trichloride into water dissolving, hydrochloric acid for uniformly stirring, transferring mechanical stirring reactor, carrying out hydrothermal reaction under condition 100-160 DEG C 12-24 hours so as obtain alpha-Fe2O3 nanosphere; 2, dispersing nanosphere prepared step 1 20-98vol% ethanol according solid-to-liquid ratio 1g:60ml 1g:120ml, ammonium hydroxide an solution tetraethoxysilane, performing ultrasonic treatment at temperature 20-30 2-4 hours, forming alpha-Fe2O3@SiO2 core-shell structure; 3, structure obtained 2 acid, reacting 6-12 preparing hollow microsphere; 4, calcining 3 reducing atmosphere, washing, magnetic separation, thereby obtaining disclosed by is controllable structure, high stability, dispersity, difficult agglomeration adsorptive capacity.