▎ 摘　　要

NOVELTY - Preparation of seaweed-derived chlorine-atom-doped graphene quantum dots, involves adding 1 g recycled seaweed waste to 80 ml dilute hydrochloric acid with a concentration of 0.05-0.1 mol/L, stirring, ultrasonically activating the surface for 2-20 hours, stopping ultrasonic activation, filtering, repeatedly washing with deionized water until the pH of filtrate is 7, ultrasonically dispersing the activated seaweed waste as precursor, and ethanol/trichloromethane as mixed solvent (volume ratio of 1:3-3:1), adding the reaction solution to a PTFE-lined reactor, reacting for 5-24 hours at 100-230degrees Celsius, cooling naturally to room temperature, taking out, filtering with a 220-nm filter membrane, removing insoluble carbon products to obtain a large amount of dispersed graphene quantum dot solution, transferring the filtered solution to a dialysis bag, dialyzing, and drying the solution at 60degrees Celsius to obtain brown-gray graphene quantum dot powder. USE - Preparation of seaweed-derived chlorine-atom-doped graphene quantum dots used for cell imaging (claimed). ADVANTAGE - The method uses economical and easy-to-obtain seaweed as precursor, and provides quantum dots having excellent biocompatibility, long emission wavelength, excellent water solubility, and low toxicity. The quantum dots can successfully enter the cell.