Method for preparing heavy metal adsorbent by using modified bagasse

The invention provides a method for preparing a heavy metal adsorbent by using modified bagasse. The method comprises the following steps of: a. stoving or drying the bagasse, and then crushing and sieving so as to obtain bagasse powder; b. immersing the bagasse powder in a potassium permanganate solution with the concentration of (0.8 to 1.2) g/L, uniformly stirring, importing nitrogen and removing oxygen, and reacting for 40 to 80 minutes at the temperature of 40 DEG C to 70 DEG C; d. then adding acrylonitrile and N, N,-methylenediacrylamide, importing nitrogen and removing oxygen again, and reacting for 40 to 80 minutes at the temperature of 40 DEG C to 70 DEG C; e. in the step d, adding a hydroquinone solution with the concentration of (8 to 12) mg/L 2 to 5 minutes before the reaction is finished; and f. washing a reactant, draining, filtering and drying so as to obtain a heavy metal adsorbent crude product, wherein the addition amounts of the acrylonitrile, the N, N,-methylenediacrylamide and the hydroqu