▎ 摘　　要

NOVELTY - The preparation of porous graphene material from water Hyacinth involves: (1) washing water Hyacinth salvage and vacuum-drying at 80 degrees C for 12 hours; (2) boiling dried water Hyacinth in hydrochloric acid for 1-10 hours, filtering and vacuum drying; (3) pre-carbonizing dried product in nitrogen atmosphere at 300-900 degrees C; (4) mixing carbonized product with potassium hydroxide and annealing at 400-1000 degrees C; and (5) washing obtained product washed with hydrochloric acid, then washing several times with distilled water and drying at 80 degrees C. USE - Method is useful for preparing porous graphene material, which is useful in electrochemical, electronic and environmental applications. ADVANTAGE - The method enables simple, economical, environmentally-friendly and reliable preparation of porous graphene material from natural raw materials. DETAILED DESCRIPTION - The preparation of porous graphene material from water Hyacinth involves: (1) washing water Hyacinth salvage, vacuum-drying at 80 degrees C for 12 hours; (2) boiling dried water Hyacinth in 0.1-5 mol/l hydrochloric acid for 1-10 hours, filtering and vacuum drying at 80 degrees C for 12 hours; (3) pre-carbonizing dried product in nitrogen atmosphere by heating at 300-900 degrees C at heating rate of 1-15 degrees C/minute for 1-5 hours; (4) mixing carbonized product with potassium hydroxide in mass ratio of 1:1-1:8 in nitrogen atmosphere, annealing by heating at 400-1000 degrees C at heating rate of 1-10 degrees C/minute for 1-10 hours and cooling to room temperature; and (5) washing obtained product with 0.1-3.0 mol/l hydrochloric acid, then washing several times with distilled water and drying at 80 degrees C.