Preparation method of silicon dioxide cationic adsorbent

The present invention belongs to the field of materials technology for producing a composite sorbent cationic silica. Object of the present invention to provide a method for preparing a silica-cationic adsorbent. Comprising the steps of: (1) dosing; (2) to form a gel; (3) adjusting the pH, heating, insulation; (4) was filtered, washed with water; (5) dispersed; (6) dehydrated and dried to obtain the product . The present invention is made of the holes of the product volume of 1.2-1.4ml / g, BET specific surface area of ​​400-450m2 / g, 1-2um average particle size; the metal cation has a high adsorption capacity; and raw materials readily available, inexpensive, process is short, easy to realize industrialization.