▎ 摘　　要

NOVELTY - Preparing amino functionalized magnesium aluminide (MgAl)- layered double hydroxide (LDH) composite airgel, involves: (a) dissolving magnesium chloride hexahydrate, aluminum chloride hexahydrate and urea in deionized water and stirring to obtain a mixed solution A; (b) adding the mixed solution A into the inner lining of the reactor, performing a hydrothermal reaction to obtain a white gel of MgAl-LDH; (c) washing the white gel, separating the washed liquid and drying to obtain MgAl-LDH and grinding into powder; (d) adding anhydrous ethylenediamine to graphene oxide solution in a beaker and stirring to obtain a solution B; (e) adding the MgAl-LDH powder to the solution B and stirring to obtain a mixed solution C; (f) adding the solution C into the inner lining of the reactor and carrying out a hydrothermal reaction to obtain MgAl-LDH/graphene hydrogel; (g) washing the obtained sample, soaking and freeze-drying to obtain amino-functionalized graphene of MgAl-LDH composite airgel. USE - Method for preparing amino functionalized magnesium aluminide (MgAl)-layered double hydroxide (LDH) composite airgel. ADVANTAGE - The method enables to load MgAl-LDH on the graphene airgel, which not only improves the agglomeration of graphene sheets and the dispersion of LDH, but also effectively increases the adsorption capacity of carbon dioxide due to their large specific surface area. DETAILED DESCRIPTION - Preparing amino functionalized magnesium aluminide (MgAl)- layered double hydroxide (LDH) composite airgel, involves: (a) dissolving magnesium chloride hexahydrate, aluminum chloride hexahydrate and urea in deionized water, mixing and stirring uniformly to obtain a mixed solution A; (b) adding the mixed solution A into the inner lining of the reactor, performing a hydrothermal reaction to obtain a white gel of MgAl-LDH; (c) washing the white gel with deionized water many times, separating the washed liquid through a centrifuge, drying the white precipitate obtained by centrifugation to obtain MgAl-LDH and grinding into powder; (d) adding anhydrous ethylenediamine to graphene oxide solution in a beaker, mixing and stirring to obtain a solution B; (e) adding the MgAl-LDH powder to the solution B and stirring to obtain a mixed solution C; (f) adding the solution C into the inner lining of the reactor and carrying out a hydrothermal reaction to obtain MgAl-LDH/graphene hydrogel; (g) washing the obtained sample with deionized water, soaking in a mixed solvent of deionized water and absolute ethanol after washing and freeze-drying the sample after soaking to obtain amino-functionalized graphene of MgAl-LDH composite airgel.