▎ 摘　　要

NOVELTY - Preparing porous graphene-based air purifying agent comprises e.g. adding foaming agent into polypropylene resin, mixing evenly, electrospinning, calcining the polypropylene fiber at 300-450 degrees C for 2-4 hours, mixing with soluble metal salt, silane coupling agent and organic titanate in a solvent to obtain mixed system, and then adding mineral acid to adjust the pH of the mixed system to be acidic, then ultrasonic treating for 15-30 minutes, and sealing the reaction at 80-120 degrees C for 3-6 hours to obtain modified porous carbon fiber, mixing the graphene oxide with metal oxy-acid salt in aqueous solution, then adding melamine under closed conditions, sealing the reaction at 80-150 degrees C for 3-8 hours to obtain mixed system, and reacting the mixed system in the microwave for 1-15 minutes to obtain porous modified graphene oxide, mixing modified porous carbon fiber and porous modified graphene oxide in a solvent, stirring for 30-45 minutes, and then drying. USE - The method is useful for preparing porous graphene-based air purifying agent. ADVANTAGE - The method: adsorbs harmful gases in the air; catalyzes the harmful gases in situ at the adsorption point; and the graphene-based air purifying agent has high catalytic efficiency and high removal rate. DETAILED DESCRIPTION - Preparing porous graphene-based air purifying agent comprises (i) adding foaming agent into the polypropylene resin and mixing evenly, and electrospinning to obtain polypropylene fibers, and calcining the polypropylene fiber at 300-450 degrees C for 2-4 hours to obtain porous carbon fiber, (ii) mixing porous carbon fiber, soluble metal salt, silane coupling agent and organic titanate in a solvent to obtain mixed system, and then adding mineral acid to adjust the pH of the mixed system to be acidic, then ultrasonic treating for 15-30 minutes, and sealing the reaction at 80-120 degrees C for 3-6 hours to obtain modified porous carbon fiber, (iii) mixing the graphene oxide with metal oxy-acid salt in aqueous solution, then adding melamine under closed conditions, sealing the reaction at 80-150 degrees C for 3-8 hours to obtain mixed system, and reacting the mixed system in the microwave for 1-15 minutes to obtain porous modified graphene oxide, and (iv) mixing modified porous carbon fiber and porous modified graphene oxide in a solvent, stirring for 30-45 minutes, and then drying to obtain final product.