▎ 摘　　要

NOVELTY - The preparation method of beta -cyclodextrin-graphene oxide-diatomaceous earth composite material involves ultrasonically dispersing graphene oxide in N,N-dimethylformamide, centrifuging mixture, adding isophorone diisocyanate to supernatant, then dripping dibutyltin dilaurate, heating in water bath, adding beta -cyclodextrin to N,N-dimethylformamide and dibutyltin dilaurate, reacting in water bath, dissolving diatomaceous earth in sodium hydroxide solution and soaking, washing, dissolving beta -cyclodextrin, graphene oxide and diatomaceous earth in water and ultrasonically mixing. USE - The method is useful for preparing beta -cyclodextrin-graphene oxide-diatomaceous earth composite material (claimed). ADVANTAGE - The method enables simple and convenient preparation of beta -cyclodextrin-graphene oxide-diatomaceous earth composite material with excellent adsorption effect and adsorption rate. DETAILED DESCRIPTION - The preparation method of beta -cyclodextrin-graphene oxide- diatomaceous earth composite material involves ultrasonically dispersing graphene oxide in N,N-dimethylformamide, centrifuging mixture, adding isophorone diisocyanate to supernatant, then dripping dibutyltin dilaurate, heating in water bath under protection of nitrogen at 35-95 degrees C for 0.5-6 hours, where the mass ratio of graphene oxide and N,N-dimethylformamide is 1:50-150, the mass ratio of graphene oxide and isophorone diisocyanate is 1:10-20, and the mass ratio of dibutyltin dilaurate and isophorone diisocyanate 1:30-100, adding beta -cyclodextrin to N,N-dimethylformamide and dibutyltin dilaurate, reacting in water bath at 30-95 degrees C for 0.5-6 hours, filtering, washing, and vacuum drying at 50 degrees C to obtain beta -cyclodextrin-graphene oxide and grinding, where the mass ratio of beta -cyclodextrin and N,N-dimethylformamide is 1:1-10, the mass ratio of dibutyltin dilaurate and beta -cyclodextrin is 1:20-100, and the mass ratio of graphene oxide and beta -cyclodextrin is 1:10-20, dissolving diatomaceous earth in 16.75-55% sodium hydroxide solution and soaking at 55-100 degrees C for 0.5-5 hours, washing with deionized water, and drying at 105 degrees C to obtain pretreated diatomaceous earth, where the mass ratio of sodium hydroxide and diatomaceous earth is 1:1-5, dissolving beta -cyclodextrin, graphene oxide and diatomaceous earth in water and ultrasonically mixing for 2 hours, where the mass ratio of beta -cyclodextrin-graphene oxide and diatomaceous earth is 1:1-5. INDEPENDENT CLAIMS are included for the following: (1) beta -cyclodextrin-graphene oxide- diatomaceous earth composite material prepared by the method; and (2) use of beta -cyclodextrin-graphene oxide-diatomaceous earth composite material for absorbing dye in wastewater.