Abstract:cing factors of magnetic biochar adsorbing heavy metals were summarized. The application of magneticbiochar was described. The analysis showed that the influence of raw materials for preparing biochar onadsorption performance was related to the structure of biomass. The existing forms of heavy metal ionsand surface charge of biochar were significantly affected by the solution pH. With the increase of pyrol⁃ysis temperature, the specific surface area and porosity of biochar increased, but the pyrolysis yield ofbiochar decreased. After magnetic modification, the specific surface area of biochar, the types andquantities of surface functional groups increased, which could significantly improve the removal effi⁃ciency of heavy metal ions. Moreover, biochar could be easier to separate from aqueous solution aftermagnetic modification. Close-