▎ 摘　　要

NOVELTY - Preparing rice-wheat straw graphene comprises depleting and scorching rice and wheat straw into charcoal powder, graphitizing carbon powder under an environment of 2400-2600 degrees C after the activation treatment, activating and strengthening to obtain artificial graphite, adding concentrated sulfuric acid into the reaction pot, cooling to -5 to 0 degrees C, adding artificial graphite, mixing, adding sodium nitrate, reacting at 3?0C for 50 minutes, adding potassium permanganate, reacting at 98-100 degrees C for 1 hour, controlling the temperature to 35 degrees C for 1 hour, centrifugally washing to remove concentrated sulfuric acid, and drying at 30-45 degrees C. USE - The rice-wheat straw graphene is useful as friction material (claimed). ADVANTAGE - The method is economical.