▎ 摘　　要

NOVELTY - A three-dimensional layered metal hydroxide/graphene pneuma gel composite material preparing method involves dissolving a trivalent metal nitrate, divalent metal nitrate and urea in deionized water to obtain an aqueous solution of a metal nitrate. Synthetic graphite oxide is dissolved in deionized water, and sonicated to obtain an aqueous solution of a thin graphite sheet. The aqueous solution of thin graphite sheet is mixed in a resulting metal nitrate solution and poured into the autoclave. The resulting reaction mixture is freeze-dried to obtain the finished product. USE - Method for preparing a three-dimensional layered metal hydroxide/graphene pneuma gel composite material. ADVANTAGE - The method enables preparing the three-dimensional layered metal hydroxide/graphene pneuma gel composite material in a simple, easy and eco-friendly manner. DETAILED DESCRIPTION - A three-dimensional layered metal hydroxide/graphene pneuma gel composite material preparing method involves dissolving a trivalent metal nitrate, divalent metal nitrate and urea in deionized water, in a molar ratio of 1:0.5-3:1.5-20 to obtain an aqueous solution of a metal nitrate, where the divalent metal nitrate is magnesium nitrate dihydrate, ferric nitrate nonahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, copper nitrate trihydrate and/or zinc nitrate hexahydrate, and the trivalent metal nitrate is aluminum nitrate nonahydrate, ferric nitrate nonahydrate, copper nitrate hexahydrate, indium nitrate, calcium nitrate dehydrate, zinc nitrate hexahydrate, chromium nitrate nonahydrate and/or titanium nitrate. Synthetic graphite oxide is dissolved in deionized water, and sonicated to obtain an aqueous solution of a thin graphite sheet. The aqueous solution of thin graphite sheet is mixed in a resulting metal nitrate solution and poured into the autoclave to control the temperature of 120-180 degrees C, and reacted for 12-36 hours. The resulting reaction mixture is allowed to stand in deionized water and freeze-dried for 24-48 hours to obtain a three-dimensional layered metal hydroxide nanosheet/grapheme pneuma gel composite.