Preparation method for graphene

The invention discloses a preparation method for graphene. According to the method, the graphene is obtained by reduction and oxidization by adopting a food antioxidant. The preparation method is green, safe, mild and simple in the preparation process; and the obtained grapheme is high in quality and benefits mass preparation. The graphene prepared by the method has potential application value in aspects of separation, enriching, a composite material based on the grapheme and the like.