▎ 摘　　要

NOVELTY - Reduced graphene oxide obtained by functionalizing graphene oxide with amine groups is claimed. USE - The amino functionalized reduction-oxidation graphene is useful for high efficient absorption of purified tea matrix (claimed). ADVANTAGE - The method: uses low cost raw materials; carries out reduction of graphene oxide, which has extremely high substrate purifying effect due to generation of polar groups e.g. amide group, carboxy group, hydroxy group and epoxy group, for increasing pigment, alkaloid, tea polyphenol and saccharide in the tea matrix with high interaction strength; produces functional reduction-oxidation grapheme, which guarantees large adsorption capacity and high purifying effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing reduced graphene oxide, comprising (a) dispersing graphene oxide and small molecule ethylenediamine solvent in a solvent by heating, where the graphene oxide is prepared by Hummer method, where the short chain small amine molecule is amine in the amino functionalized is small molecule amine having less than 8 carbon atoms, preferably aqueous ammonia, ethylamine, propylamine, ethylenediamine, n-butylamine, tert-butylamine, tri-n-butylamine and/or hexamethylenediamine and the solvent is glycol, ethanol and methanol and (b) adding the mixture into a centrifuge for separation, washing and drying.