▎ 摘　　要

NOVELTY - Functionalized graphene oxide-cyclodextrin composite hydrogel is prepared by (i) adding distilled water and N,N-dimethylformamide mixed solvent to a flask, adding graphene oxide, ultrasonically dispersing in an ultrasonic disperser, adding 3-mercaptopropionic acid and azobisisobutyronitrile catalyst, heating, and stirring to obtain carboxyl functionalized graphene oxide, (ii) adding N,N-dimethylformamide solvent, carboxyl functionalized graphene oxide, and toluene diisocyanate to flask, ultrasonically processing, adding dibutyltin dilaurate catalyst, and heating, and reacting, (iii) adding N,N-dimethylformamide solvent, isocyanate-functionalized graphene oxide and beta -cyclodextrin to flask, ultrasonically processing, adding dibutyltin dilaurate catalyst, heating, and reacting, and (iv) adding sodium hydroxide solution and functionalized graphene oxide grafted cyclodextrin to the flask, adding epichlorohydrin crosslinking agent, heating, and performing crosslinking reaction. USE - The functionalized graphene oxide-cyclodextrin composite hydrogel is used for water pollution treatment. ADVANTAGE - The functionalized graphene oxide-cyclodextrin composite hydrogel has excellent complex adsorption and electrostatic attraction for organic dyes such as methylene blue and heavy metal ions such as copper ion. DETAILED DESCRIPTION - Functionalized graphene oxide-cyclodextrin composite hydrogel is prepared by (i) adding distilled water and N,N-dimethylformamide mixed solvent to a flask, adding graphene oxide, ultrasonically dispersing in an ultrasonic disperser until the dispersion is uniform, adding 3-mercaptopropionic acid and azobisisobutyronitrile catalyst, heating at 55-75 degrees C in a nitrogen atmosphere, and stirring for 18-36 hours to obtain carboxyl functionalized graphene oxide, (ii) adding N,N-dimethylformamide solvent, carboxyl functionalized graphene oxide, and toluene diisocyanate to the flask, ultrasonically processing until the dispersion is uniform, adding dibutyltin dilaurate catalyst, and heating at 60-80 degrees C in a nitrogen atmosphere, and reacting for 24-48 hours to obtain isocyanate functionalized graphene oxide, (iii) adding N,N-dimethylformamide solvent, isocyanate-functionalized graphene oxide and beta -cyclodextrin to the flask, ultrasonically processing until the dispersion is uniform, adding dibutyltin dilaurate catalyst, heating at 70-100 degrees C in a nitrogen atmosphere, and reacting for 18-36 hours to obtain functionalized graphene oxide grafted cyclodextrin, and (iv) adding sodium hydroxide solution and functionalized graphene oxide grafted cyclodextrin to the flask, adding epichlorohydrin crosslinking agent after the dispersion is uniform, heating at 40-60 degrees C, and performing crosslinking reaction for 2-6 hours to obtain the functionalized graphene oxide-cyclodextrin composite hydrogel.