▎ 摘　　要

NOVELTY - A graphene oxide composite material comprises frozen graphene oxide and modified kaolinite particle according to mass ratio of 1:100-500. The modified kaolinite particle is prepared by dispersing kaolin in purified water, suspending for 1-12 hours, and Ferric trichloride modifying precipitate. USE - Graphene oxide composite material used for removing underground heavy metal (claimed). ADVANTAGE - The product is micron level, safe, environment-friendly and convenient to transport, has long shelf life, wide raw material source, low cost and simple preparation process, removes underground water heavy metals including lead, and does not generate secondary pollution to underground water. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene oxide composite material comprising adding kaolin to purified water, ultrasonically dispersing for 0.5-2 hours, standing for 1 hour, absorbing suspension, standing for 12 hours, layering, removing suspension to obtain precipitate, drying to obtain kaolinite particles, adding purified water for 4-10 times. ultrasonically dispersing for 0.5-2 hours to obtain suspension, stirring, adding ferric chloride hexahydrate water solution, adjusting pH to 5.5-6.5, introducing nitrogen gas for 0.5-1 hour, sealing, placing at 50-60 degrees C for 5-6 days, standing at room temperature for 30 days, unsealing, taking out precipitate, rinsing using purified water, freeze-drying to obtain micron grade modified kaolinite particles, placing into purified water for 30-60 times, stirring for 1-2 hours, secondary adjusting pH value to 4-5, adding graphene oxide suspension, stirring for 2-8 hours, standing for 12 hours, taking out precipitate, and drying.