Preparation method for graphene quantum dots with different oxygen contents, graphene quantum dot, and fluorescent material

A preparation method for graphene quantum dots with different oxygen contents, comprising:

• a step of converting a graphene oxide to a graphene quantum dot powder and a step of purifying the graphene quantum dot powder,
• wherein the step for converting a graphene oxide to a graphene quantum dot consists of:
• step 1:
• dispersing a graphene oxide in a peroxide solution containing hydroxyl radicals to obtain a graphene oxide dispersion;
• step 2:
• mixing the graphene oxide dispersion with an alkali liquor, purifying to obtain a graphene quantum dot dry powder,
• wherein the step of purifying the graphene quantum dot powder comprises:
• step 3:
• reacting the purified product with a reducing agent in a solvent reduce an oxygen content of the graphene quantum dots, and purifying to obtain the graphene quantum dot dry powder, wherein the reducing agent is at least one of:
• potassium borohydride, zinc-hydrochloric acid, iron-acetic acid, lithium aluminum hydride, sodium naphthalene, sodium amalgam, and Raney nickel, and
• step 4:
• loading the graphene quantum dot dry powder on a carrier, performing a gradient elution to obtain a plurality of graphene quantum dots with different oxygen contents.