▎ 摘　　要

NOVELTY - Air purifying graphene sponge, loaded with a nano-silver doped graphene composite material layer is claimed. The nano-silver doped graphene composite material layer thickness is 0.2-1.5 mm. The mass ratio of nano-silver doped graphene composite layer is 5-10%. USE - Used as air purifying graphene sponge. ADVANTAGE - The sponge: has strong hydrophobic effect and absorption capacity; is loaded with nano-silver with sterilizing and bacteriostatic effect and prevents from bacterial breeding; and has good formaldehyde, sulfur dioxide, ammonia, nitrous oxide or carbon dioxide absorption performance. The method is simple, economical, and causes no pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing air purifying graphene sponge comprising (i) carrying out expansion of graphene by adding N-methyl-2-pyrrolidone solution, carrying out ultrasonic dispersion, to obtain single-layer graphene N-methyl-2-pyrrolidone solution; (ii) adding silver nitrate aqueous solution and tannic acid aqueous solution with the same concentration into the single layer graphene N-methyl-2-pyrrolidone solution to prepare the nano silver-graphene suspension, where the mass ratio of silver nitrate to graphene is 10-100; (iii) immersing sponge in nano silver-graphene suspension, stirring and performing ultrasonication, removing the sponge, washing with deionized water, and drying to obtain nano-silver doped graphene composite material layer loaded melamine sponge.