▎ 摘　　要

NOVELTY - Preparation of graphene-mesoporous silica aerogel involves adding sulfuric acid and phosphoric acid to reactor, cooling, adding graphite powder, heating with potassium permanganate, adding deionized water, reacting, neutralizing, washing, and drying; taking silicon dioxide, dispersing, centrifuging, and stabilizing; adding sodium hydroxide solution, silicon source, and graphene oxide solution to aqueous cetyl trimethyl ammonium bromide solution, reacting, aging, adding reducing agent, reacting, washing, and freeze-drying; and removing templating agent. USE - Method for preparing graphene-mesoporous silica aerogel (claimed) used for adsorbing heavy metal ions and organic contaminants in sewage. ADVANTAGE - The aerogel is environment-friendly, has high adsorption selectivity, high specific surface area, good stability, and improved adsorption capacity, and is easily separated from solution after adsorption. The method is simple. DETAILED DESCRIPTION - Preparation of graphene-mesoporous silica aerogel comprises: (A) taking graphite as raw material, adding concentrated sulfuric acid and phosphoric acid to reactor, placing in an ice water bath, where volume ratio of concentrated sulfuric acid to phosphoric acid ratio of 2-15:1, cooling to 0 degrees C, adding 1 g graphite powder, vigorous stirring, slowly adding 3 g potassium permanganate, reacting at 20 degrees C for 1 hour, water bath heating at 35-45 degrees C for 30 minutes, gradually adding 46 mL deionized water, continuously reacting to 98 degrees C for 40 minutes, adding 140 mL deionized water and 30% hydrogen peroxide, neutralizing unreacted potassium permanganate, repeatedly washing with dilute hydrochloric acid, washing with deionized water until filtrate is neutral, and drying; (B) taking mesoporous silicon dioxide, ultrasonic dispersing, centrifuging to remove non-exfoliated graphite oxide and impurities, and stabilizing for 1-24 hours to obtain silicon source; (C) taking aqueous sodium hydroxide solution, silicon source, and graphene oxide solution, stirring, slowly adding to aqueous cetyl trimethyl ammonium bromide solution, where molar ratio of cetyl trimethyl ammonium bromide solution, silicon source, sodium hydroxide solution, water, and graphene oxide is 0.12:1:0.6:100:x, reacting for 1-12 hours, aging at room temperature, adding reducing agent, reacting in oven at 70-100 degrees C for 1-10 hours, washing reaction product was, and vacuum freeze-drying at - 70 degrees C to - 90 degrees C for 12-24 hours to obtain graphene-silica aerogel; and (D) removing template cetyl trimethyl ammonium bromide.