▎ 摘　　要

NOVELTY - A graphene-modified material preparing method involves adding dicyclohexylcarbodiimide as catalyst to 0.15-0.85 mg/ml graphite in aqueous rare earth nanomaterial solution, activating the mixture for 20 minutes-1 hour, adding aromatic compound in ethyl alcohol solution to the mixture and heating the mixture in water bath at 40-60 degrees C for 1-5 hours. The obtained product is stirred for 5-18 hours and centrifuged at 2000-10000 revolutions/minute for 30-60 minutes to obtain finished product. USE - Method for preparing graphene-modified material that is utilized in detecting sodium ions in mixed solvent of ethanol and water (claimed). ADVANTAGE - The method enables preparing graphene-modified material in simple and rapid manner under room temperature, and with strong practicability and wide application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for detecting silver ions in mixed solvent of ethanol and water, which involves dispersing the graphene-modified material in mixed solvent of ethanol and water, washing the graphene-modified material with water, and detecting silver ions.