▎ 摘　　要

NOVELTY - Chitosan/graphene oxide/polyvinyl alcohol composite adsorption material comprises chitosan, graphene oxide and polyvinyl alcohol, which are subjected to preliminary crosslinking modification under acidic conditions and vacuum freeze drying. USE - Chitosan/graphene oxide/polyvinyl alcohol composite adsorption material used for adsorbing heavy metal ion. ADVANTAGE - The chitosan/graphene oxide/polyvinyl alcohol composite adsorption material has simple preparation and easy operation, low cost, porous structure, stable structural performance, high porosity, good water absorption, and good heavy metal ion adsorption effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of chitosan/graphene oxide/polyvinyl alcohol composite adsorption material comprising preparing graphene oxide acetic acid solution, adding chitosan and stirring until completely dissolved, ultrasonically oscillating at room temperature, adding polyvinyl alcohol solution, stirring and ultrasonically processing until homogeneous, constant speed stirring in constant temperature water bath to react, slowly dropwise adding sulfuric acid solution for half an hour, esterification reacting, acetalization reacting, crosslinking reacting, putting in refrigerator, pre-freezing to solidification state, putting in vacuum freeze drier, vacuum freeze-drying, taking out and obtaining the product.