▎ 摘　　要

NOVELTY - Preparing high-quality water-soluble graphene involves adding deionized water and graphene to a round bottom flask, persulfate after magnetic stirring for a period of time at room temperature, and replacing with ultrapure nitrogen to remove oxygen (O2) and carbon dioxide (CO2) dissolved in deionized water. The metal ion aqueous solution is continuously dropped into the reaction flask through a constant pressure funnel, and the persulfate anion (S2O82-) is activated to produce sulfate radicals and continuously oxidize the edges of the graphene. The edge graphene oxide obtained is sequentially subjected to ultrasonic treatment and centrifugal washing to obtain stable dispersion of graphene dispersion. USE - Method for preparing high-quality water-soluble graphene. ADVANTAGE - The method enables to prepare high-quality water-soluble graphene in a simple manner and graphene is in powder form, has excellent conductivity and mechanical performance, and thickness of less than equal to 3mm.