▎ 摘　　要

NOVELTY - Removing graphene material comprises (a) washing the obtained graphene with deionized water at 30 degrees C after activating the strong base, (b) repeatedly removing impurity and cleaning with solution at 30 degrees C, (c) repeatedly washing with deionized water at 30 degrees C, and (d) finally calcining the graphene at 500-1200 degrees C for 0.5-10 hours to obtain the graphene powder. USE - The method is useful for removing graphene material. ADVANTAGE - The method is capable of simply removing graphene material without any impurities. The graphene material lowers heavy metal ion content (below 300 ppm), and alkali metal ion content (below 1500 ppm).