▎ 摘　　要

NOVELTY - Preparing graphene-like biochar for heavy metal removal involves using plant petals as biochar carbon source material, washing and drying the collected petals for use. The obtained petal carbon source is placed in a water-soluble sulfur-nitrogen compound solution, and combined the petals with the sulfur-nitrogen compound in a ratio of 1:1-3:1 by mass ratio of the petals as carbon source to the sulfur-nitrogen compound to obtain a mixture. The obtained mixture is placed in a quartz boat, and performed a pyrolysis reaction at 600-800 degrees C under an argon atmosphere for 3-5 hours to obtain a black solid product. The obtained black solid product is placed into an aqueous solution of nitric acid, and then performed acidification oxidation treatment for 1-3 hours to obtain an acidification oxidation product. USE - Method for preparing graphene-like biochar for heavy metal removal used for removing lead ions or cadmium ions in an aqueous solution (claimed). ADVANTAGE - The method prepares the graphene-like biochar for heavy metal removal in a simple, cost-effective and eco-friendly manner with good adsorption effect, good industrialization prospects, and has high preparation efficiency without using toxic and harmful reagents. DETAILED DESCRIPTION - Preparing graphene-like biochar for heavy metal removal involves using plant petals as biochar carbon source material, washing and drying the collected petals for use. The obtained petal carbon source is placed in a water-soluble sulfur-nitrogen compound solution, and combined the petals with the sulfur-nitrogen compound in a ratio of 1:1-3:1 by mass ratio of the petals as carbon source to the sulfur-nitrogen compound to obtain a mixture. The obtained mixture is placed in a quartz boat, and performed a pyrolysis reaction at 600-800 degrees C under an argon atmosphere for 3-5 hours to obtain a black solid product. The obtained black solid product is placed into an aqueous solution of nitric acid, and then performed acidification oxidation treatment for 1-3 hours to obtain an acidification oxidation product. The obtained acidified oxidation product is centrifuge and collected, and then alternately washed the product with ethanol and deionized water, and placed in a vacuum freeze dryer for 12 hours to obtain a dried product. The obtained product is placed by drying in a strong alkali aqueous solution under stirring at room temperature for 12-24 hours for alkali activation, and then centrifuged and collected to obtain a dried product. The obtained product is placed in a tube furnace under an argon atmosphere at 600-800 degrees C for a heating reaction for 1-3 hours, and then washed the resulting product with hydrochloric acid, deionized water and ethanol, respectively. The obtained black powder is dried to obtain the nitrogen-sulfur co-doped graphene-like biochar material with strong heavy metal adsorption performance.