▎ 摘　　要

NOVELTY - Preparing porous air gel containing polyamino three-dimensional graphene comprises dissolving aqueous-soluble polymerizable monomers, initiators and cross-linking agent in water to obtain aqueous phase reaction solution, dispersing hydroxy-containing graphene oxide and hydroxy-containing single-wall thin-walled carbon nano tubes in aqueous reaction solution, injecting the material into a mold, performing free radical polymerization to obtain hydrogel, freeze-drying to obtain porous airgel containing three-dimensional grapheme, mixing polyamino compound and methanol solution, performing Michael addition reaction, polycondensation reaction to obtain a polyamino hyper-branched polymer and mixing porous airgel containing three-dimensional graphene with polyamino hyper branched polymer in a tetrahydrofuran solution containing dicyclohexylcarbodiimide and 4-dimethylaminopyridine, ultrasonically dispersing, stirring, condensing, refluxing and carrying out grafting reaction to obtain product. USE - The porous air gel containing polyamino three-dimensional graphene is used as metal ion adsorbent in sewage treatment (claimed). ADVANTAGE - The porous airgel can be used for complex adsorption treatment of heavy metal ions in sewage and has excellent adsorption performance. DETAILED DESCRIPTION - Preparing porous air gel containing polyamino three-dimensional graphene comprises (a) dissolving aqueous-soluble polymerizable monomers, initiators and cross-linking agents in water to obtain a aqueous phase reaction solution, where the aqueous-soluble polymerizable monomer comprises acrylamide and sodium alginate in a ratio of 1:(3.2-3.3), (b) dispersing hydroxy-containing graphene oxide and hydroxy-containing single-wall thin-walled carbon nano tubes in the aqueous reaction solution, where the mass ratio of the hydroxy-containing graphene oxide, the hydroxy-containing single-layer thin-walled carbon nanotubes and the aqueous reaction solution is 1:(0.5-1.5):(1650-1700), (c) injecting the material obtained in the step (b) into a mold, performing free radical polymerization to obtain a hydrogel, (d) freeze-drying the hydrogel to obtain a porous airgel containing three-dimensional grapheme, (e) mixing the polyamino compound and the methanol solution of methyl acrylate under the protection of an inert gas, firstly performing Michael addition reaction, performing a polycondensation reaction to obtain a polyamino hyper-branched polymer, where the molar ratio of the polyamino compound to methyl acrylate is (0.8-1.2): 1 and (f) mixing the porous airgel containing three-dimensional graphene with the polyamino hyperbranched polymer in a tetrahydrofuran solution containing dicyclohexylcarbodiimide and 4-dimethylaminopyridine, ultrasonically dispersing, transferring the system into a reaction vessel with nitrogen bubbling, stirring, condensing, refluxing and carrying out grafting reaction under the protection of an inert gas to obtain a product, where the mass ratio of the porous airgel containing three-dimensional graphene to the polyamino hyper-branched polymer is 1:(10-30).