▎ 摘　　要

NOVELTY - Preparing a modified graphene material involves: (A) mixing graphite oxide and water in a mass ratio of 1:(30-50) and stirring to obtain a paste-like product; (B) freeze-drying the paste-like product under low temperature, low humidity and vacuum conditions to obtain a freeze-dried product; and (C) annealing the freeze-dried product. USE - The method is useful for preparing a modified graphene material. ADVANTAGE - The method enables simple and economical preparation of the modified graphene material with high catalytic activity. The graphene material can reduce the chemical oxygen demand, ammonia nitrogen and total phosphorus of the V-type indicators in rivers to 37, 1 and 0.14 (mg/l), respectively. The dissolved oxygen of the black odor index is increased to 9.43 mg/minute. The suspended substance is reduced to 3.42 mg/l. The graphene material can initially achieve the elimination of inferior V-type and black odorous water components. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the modified graphene material, where the modified graphene is rich in one of edges, pore structures, five-membered rings, seven-membered rings and heteroatoms, and has a Brunauer-Emmett-Teller specific surface area of 200-1100 m2/g, a pore volume of 1.6-2 cm3/g and a pore size of 3-30 nm.