▎ 摘　　要

NOVELTY - Preparing graphene having absorption performance by zinc oxide reduction of graphene oxide comprises mixing flake graphite, potassium persulfate, phosphorus pentoxide and 98% concentrated sulfuric acid, reacting, diluting and washing to neutral, vacuum filtering, drying, grinding to obtain oxidized graphite precursor, placing oxidized graphite precursor and 98% concentrated sulfuric acid in an ice water bath, stirring while slowly adding potassium permanganate, adding concentrated sulfuric acid, reacting to obtain dark green viscous liquid, adding deionized water and hydrogen peroxide to obtain bright yellow solution, filtering, washing with dilute hydrochloric acid and deionized water, drying, grinding to obtain graphite oxide reaction body, mixing with deionized water to obtain a brown suspension, ultrasonically vibrating to obtain brown graphene oxide dispersion, adding zinc powder into graphene oxide dispersion, mixing, filtering to obtain a filter cake, drying and grinding. USE - The method is useful for preparing graphene by zinc oxide reduction of graphene oxide. ADVANTAGE - The graphene prepared by the method has high absorption performance. DETAILED DESCRIPTION - Preparing graphene having absorption performance by zinc oxide reduction of graphene oxide comprises (a) generating reaction oxidized graphite precursor by (a1) taking flake graphite, potassium persulfate, phosphorus pentoxide and 98% concentrated sulfuric acid in a mass ratio of (8-10):(4-6):(3-5):(38-40), (a2) mixing in a constant temperature water bath of 60-80 degrees C, and reacting for 6-8 hours, and (a3) diluting and washing to neutral with deionized water, vacuum filtering, grinding after drying at room temperature to obtain oxidized graphite precursor, (b) preparing oxidized graphite by (b1) secondary oxidation by taking oxidized graphite precursor (g), 98% concentrated sulfuric acid (ml) and potassium permanganate (g) in a ratio of (1-3):(13-15):(4-8), firstly placing the oxidized graphite precursor and 98% concentrated sulfuric acid in an ice water bath, and stirring while slowly adding potassium permanganate to obtain a mixture, and (b2) adding concentrated sulfuric acid into the mixture in a constant temperature environment of 30-40 degrees C, and completely reacting for 2-4 hours to obtain dark green viscous liquid, (b3) taking the raw material fraction of the step (b1), 98% concentrated sulfuric acid and the first part of deionized water in a ratio of (1-3):(2-4), the first part is ionic water, taking second deionized water and hydrogen peroxide in a ratio of (28-30):(1-3), the second part deionized water and hydrogen peroxide, controlling the temperature of the dark green viscous liquid to be less than or equal to 45 degrees C, adding the first part of deionized water, adding a second part of deionized water and hydrogen peroxide after 12-18 minutes to obtain bright yellow solution, (b4) filtering bright yellow solution, washing with dilute hydrochloric acid then with deionized water to a pH of 6-6.8 to obtain a mixture, and (b5) drying the mixed solution and grinding to obtain graphite oxide reaction body, (c) preparing graphene oxide dispersion by (c1) taking graphite oxide reaction body (g) and deionized water (ml) in a ratio of (1-3):(2000-5000), mixing the graphite oxide reaction body and deionized water at 30-50 degrees C to obtain a brown suspension, and (c2) ultrasonically vibrating the brown suspension to be dispersed to obtain brown graphene oxide dispersion, and (d) reduction of graphene oxide by zinc powder to prepare graphene by (d1) taking graphene oxide dispersion (ml) and zinc powder (g) in a mass ratio of (190-210):(0.5-2), respectively, taking into 30-50 degrees C constant temperature water bath, adding zinc powder to graphene oxide dispersion, thoroughly mixing to obtain a mixture with black precipitate, and (d2) filtering the black precipitate mixture by suction to obtain a filter cake, drying and grinding.