▎ 摘 要
NOVELTY - Graphene oxide separation involves freeze-drying graphene oxide slurry with a pH of 1-6 and a solid content of 1-3 wt.% at -40 to -10 degrees C for 4 hours to completely freeze the graphene oxide slurry. The completely frozen graphene oxide slurry is thawed at room temperature to obtain a graphene oxide precipitate, where the obtained graphene oxide precipitate is separated. USE - Method for separating graphene oxide. ADVANTAGE - The method converts liquid water into solid water by freezing, forces graphene oxide to separate from the water phase, converts solid water into liquid water, and separates the graphene oxide and water by ordinary separation medium with high purity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for purifying graphene oxide, which involves: (A) washing graphene oxide repeatedly with a washing solution to remove impurities to obtain a graphene oxide slurry having a pH of 1-6; (B) freeze-drying the obtained graphene oxide slurry at -40 to -10 degrees C for 4 hours to completely freeze the graphene oxide slurry; (C) thawing the completely frozen graphene oxide slurry at room temperature to obtain a graphene oxide precipitate; and (D) separating the precipitate to give the high-purity graphene oxide with an impurity ion content of less than 100 parts per million. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic principle structure of the separated graphene oxide. (Drawing includes non-English language text).