▎ 摘　　要

NOVELTY - Preparing amino-modified graphene hydrogel, comprises (i) dissolving graphene oxide and carbon nitride in water, and mixing uniformly to obtain dispersion, and (ii) adding dispersion into crosslinking reducing agent solution to obtain mixed solution and carrying out hydrothermal reaction to obtain final product. USE - The amino-modified graphene hydrogel is useful for removing composite pollutant in wastewater (claimed). ADVANTAGE - The method: introduces large number of amine groups in graphene hydrogel to achieve efficient removal of antibiotics and heavy metal ions; adopts hydrothermal reaction, which shortens preparation time and enhances mechanical strength of graphene hydrogel; and is easy to operate and suitable for mass production. The amino-modified graphene hydrogel: has excellent repeatability, controllability, stability and low cost; is easy to separate after adsorbing pollutant, and environmentally friendly; can be recycled and reused for multiple times; and has no secondary pollution. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) amino-modified graphene hydrogel prepared by above mentioned method; (2) use method of amino-modified graphene hydrogel for removing composite pollutant in wastewater, comprising adding amino-modified graphene hydrogel into wastewater and adsorbing composite pollutant, where the composite pollutant is composite pollutant of antibiotics and heavy metal ions; and (3) regenerating amino-modified graphene hydrogel, comprising sequentially soaking amino-modified graphene hydrogel adsorbed with composite pollutant in absolute ethanol and inorganic acid to obtain amino-modified graphene hydrogel desorbed from composite pollutant.