▎ 摘　　要

NOVELTY - Preparation method of graphene oxide-N-benzyloxycarbonyl glycine composite material, comprises (a) using crystalline flake graphite as raw material to prepare graphene oxide dispersion, (b) preparing N-benzyloxycarbonyl glycine solution using N-benzyloxycarbonyl glycine as a raw material, and (c) mixing the graphene oxide dispersion with the N-benzyloxycarbonylglycine solution for self-assembly, and then freezing and drying to prepare a composite material. USE - The method is used for preparation of graphene oxide-N-benzyloxycarbonyl glycine composite material which is used as an adsorbent for adsorbing rare earth elements in water, where the rare earth element is one or more of erbium, lanthanum, neodymium, yttrium, and ytterbium, and the rare earth element salt solution is one or more of chloride salt solution and nitrate salt solution (all claimed). ADVANTAGE - The method achieves physical coating by self-assembly by introducing N-benzyloxycarbonyl glycine on the surface of graphene oxide. The method keeps the rich oxygen-containing functional groups of the graphene oxide itself while reducing the irreversible stacking of the graphene oxide due to its own pi - pi action. The method introduces amino and carboxyl groups to increase the type and number of functional groups and enhance the stability of composite materials. The method provides more active sites for the composite material, so that the composite material has excellent adsorption performance for the rare earth elements in the aqueous solution. The composite material can be reused and has potential application value. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a graphene oxide-N-benzyloxycarbonyl glycine composite material prepared by the above method, where the composite material includes graphene oxide and N-benzyloxycarbonyl glycine coated on its surface, and the composite material is a three-dimensional columnar porous composite material; and (2) an adsorbent for adsorbing rare earth elements in water, where the adsorption material is a graphene oxide-N-benzyloxycarbonyl glycine composite material prepared by the above method.