▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped graphene adsorbent from aerobic granular sludge comprises drying aerobic granular sludge from culture laboratory sequencing batch reactor at 100-110 degrees C, grinding, sieving to 100-150 mesh, putting in tubular furnace, carbonizing at 800-900 degrees C for 5-6 hours at heating rate of 12-15 degrees C/minute under nitrogen protective gas, cooling to room temperature to obtain black powder, taking out, adding into 4-8 mol/L hydrochloric acid, removing impurities, centrifuging, washing with deionized water until neutral, and drying at 100-110 degrees C to constant weight. USE - Method for preparing nitrogen-doped graphene adsorbent from aerobic granular sludge used for removal of anionic dye in water (claimed). ADVANTAGE - The method is simple and easy, has low cost, high absorption capacity and no secondary pollution, and can be used repeatedly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for removal of anionic dye in water comprising adding 20-40 mL of 10-30 mg/L anionic dye solution to 50-mL conical flask, adding 20-40 mg nitrogen-doped graphene adsorbent, oscillating at 20-40 degrees C for 2-4 hours, taking out mixed solution, centrifuging, taking supernatant, measuring absorbance by spectrophotometer, drawing concentration-absorbance working curve of anionic dye and calculating removal rate.