Method for preparing manganese dioxide adsorbent

The invention discloses a method for preparing a manganese dioxide adsorbent. The method comprises the following steps: adding manganese sulfate, potassium permanganate and concentrated sulfuric acid into a reaction kettle in a proportion of 1 to 6 to 36.8, stirring at the room temperature for 20-30 minutes, and filtering to separate precipitates, so as to obtain manganese dioxide solid; adding the manganese dioxide solid, modified mulberry twig powder and starch into an ultrasonic reactor, adding deionized water, and carrying out ultrasonic treatment at the temperature of 50-60 DEG C and the power of 200W-250W, so as to obtain paste; and transferring the paste into a muffle furnace, and roasting at 400-600 DEG C for 1.5-3 hours, so as to obtain the manganese dioxide adsorbent. The method has the advantages that the preparation process is simple, the reaction effect is high, reaction conditions are easily controlled, the energy consumption and the cost are low, and the like. Meanwhile, the prepared adsorbent