▎ 摘　　要

NOVELTY - Method for preparing agent involves preparing carboxylated graphene oxide, grafting acrylamide oligomer graphene oxide with graphene oxide and acrylamide oligomer in dimethyl sulfoxide (DMSO), then adding 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDCI), reacting, separating and washing content to obtain acrylamide oligomer grafted graphene oxide and mixing acrylamide oligomer grafted with graphene oxide, polyacrylamide and polydimethyl ammonium chloride, cooling, adding polyaluminum silicate and sodium bicarbonate and mixing product. USE - The method is useful for preparing agent which is useful for treating and removing benzene compounds and heavy metal ions in water. ADVANTAGE - The method enables preparing multi-effect agent and is cost-effective. DETAILED DESCRIPTION - Method for preparing agent involves (a) carboxylation of graphene oxide in 5 mg/ml graphene oxide aqueous solution, adding and mixing graphene oxide aqueous solution with sodium hydroxide and chloroacetic acid in a ratio of 1 l: 2 g: 2 g, mixing and reacting mixture for 4 hours, separating and washing content to obtain carboxylated graphene oxide, (b) grafting acrylamide oligomer graphene oxide with graphene oxide and acrylamide oligomer in dimethyl sulfoxide (DMSO), then adding 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDCI) to content, where ratio of DMSO, graphene oxide, acrylamide oligomer and EDCI of 1 l: 8 g: 90 g: 50 g, reacting mixed content at 45 degrees C under reflux, separating and washing the content to obtain acrylamide oligomer grafted graphene oxide and (c) mixing acrylamide oligomer grafted with graphene oxide, polyacrylamide and polydimethyl ammonium chloride, naturally cooling content to room temperature, then adding polyaluminum silicate and sodium bicarbonate and uniformly mixing content at 45 degrees C to obtain the product, where agent comprises 10 pts. wt. acrylamide oligomer graphene oxide, 30 pts. wt. polyacrylamide, 40 pts. wt. poly aluminum silicate, 25 pts. wt. polydimethyldipropylammonium chloride and 5 pts. wt. sodium bicarbonate.