Corn cob modified activated carbon adsorption material for soil heavy metals and preparation method of adsorption material

The invention relates to a corn cob modified activated carbon adsorption material for soil heavy metals and a preparation method of the adsorption material, and belongs to the technical field of soilpollution ecological restoration. The corn cob modified activated carbon adsorption material for the heavy metals has a porous carbon material with a corn cob structure, and is prepared by the following steps: after dried corn cob adsorbs a potassium permanganate solution, performing drying, performing pyrolysis in a nitrogen protective atmosphere to obtain corn cob-shaped biochar, dipping the corn cob-shaped biochar into a sodium hydroxide or potassium hydroxide solution, and performing drying to obtain the corn cob modified activated carbon adsorption material for the heavy metals. The adsorption material has a volume and strength similar to those of the corn cob, is very convenient for landfilling and recycling when soil is ploughed, has a good adsorption effect on the heavy metals in the soil, high efficiency