▎ 摘　　要

NOVELTY - Preparing graphene structure biological carbon involves preparing precursor after grinding, straw with water and put into a high-pressure reaction kettle to preserve heat, then putting into a concentrated hydrochloric acid solution for soaking, cleaning, and drying to obtain the precursor removing impurities, ion exchange, soaking the precursor in a strong alkali solution, heating and stirring to dry, finishing ion exchange, preparing the graphene-like structure of biological carbon, using inert gas as atmosphere, and heating the biomass of the ion exchange to 500-1200 ℃ to obtain the graphene-like bio-char structure. USE - Method for preparing graphene structure biological carbon for strengthening anaerobic digestion, used in heavy metal ion adsorption. ADVANTAGE - The method has simple, it can prepare in a conventional laboratory, and has a low raw material cost. It has high preparation efficiency. It has environment-friendly. It has wide application prospects in the adsorption material preparation field.