▎ 摘　　要

NOVELTY - Method for preparing graphene-loaded silicon dioxide using graphene oxide waste liquid involves (i) collecting waste liquid after preparation of graphene oxide, where the waste liquid uses potassium permanganate as oxidizing agent to prepare graphene oxide, (ii) adding phosphoric acid solution to the waste liquid to obtain first acid solution, (iii) preparing an aqueous solution of sodium silicate separately, slowly dripping dilute sulfuric to the sodium silicate aqueous solution with constant stirring, and maintaining the stirring, (iv) heating, dripping first acidic solution to the sodium silicate aqueous solution while stirring, aging, continuing to drip the first acidic solution, and stirring to obtain second acidic solution containing first precipitate, (v) filtering out the first precipitate from the second acidic solution, and repeatedly washing the first precipitate with clear water, and (vi) drying the filtered and washed first precipitate to remove water, and calcining. USE - Method useful for preparing graphene-loaded silicon dioxide using graphene oxide waste liquid as ideal filler for manufacturing rubber tire. ADVANTAGE - The method realizes reutilization of graphene oxide waste liquid and protects the environment. The graphene-loaded silicon dioxide has excellent stability, hydrophobic performance and excellent performances such as high temperature resistance, non-combustion high heat conductivity, antistatic property, and reduces the problem of too fast heat generation of the tread rubber material. DETAILED DESCRIPTION - Method for preparing graphene-loaded silicon dioxide using graphene oxide waste liquid involves (i) collecting waste liquid after preparation of graphene oxide, where the waste liquid uses potassium permanganate as oxidizing agent to prepare graphene oxide, the clarified solution obtained after separation contains potassium ions, manganese ions, sulfate ions, hydrogen ions and residual graphene oxide, and the content of graphene oxide is 0.01-1 mg/ml, (ii) adding phosphoric acid solution to the waste liquid to obtain first acid solution, (iii) preparing an aqueous solution of sodium silicate separately, slowly dripping dilute sulfuric to the sodium silicate aqueous solution with constant stirring, and maintaining the stirring for 15 minutes after the reaction reaches pH of 10, where the pH value of the sodium silicate aqueous solution is greater than 10, (iv) heating at 70-90 degrees C, dripping first acidic solution to the sodium silicate aqueous solution while stirring, aging for 60-100 minutes when the reaction reaches pH of 6-7, continuing to drip the first acidic solution to pH of 4-5, and stirring for 60-120 minutes to obtain second acidic solution containing first precipitate, (v) filtering out the first precipitate from the second acidic solution, and repeatedly washing the first precipitate with clear water, and (vi) drying the filtered and washed first precipitate to remove water, and calcining to obtain the product.