PREPARATION METHOD OF MODIFIED BIOCHAR, MODIFIED BIOCHAR, COMPOSITE MATERIAL, AND SOIL REMEDIATION AGENT

摘要

The invention provides a preparation method of modified biochar, the modified biochar, a composite material and a soil repairing agent, and relates to the technical field of biochar. The preparation method of the biochar comprises the following steps: mixing peanut shell powder with a graphene oxide suspension to obtain peanut shell powder impregnated with the graphene oxide suspension; mixing theobtained peanut shell powder impregnated with the graphene oxide suspension with the nano-SiO2 to obtain a mixed material; mixing the obtained mixed material with water to obtain a mixture; carbonizing the mixture to obtain hydrated carbon, and drying the obtained hydrated carbon to obtain the modified biochar. The modified biochar provided by the invention has porosity, large specific surface area and good adsorption capacity, and can effectively reduce the activity of soil heavy metals in the soil.