▎ 摘　　要

NOVELTY - Preparing graphene modified composite porous microsphere air purifying agent comprises adding titanium dioxide into deionized water, performing ultrasonic treatment to obtain titanium dioxide dispersion, mixing carbon nanotube with absolute ethyl alcohol, ultrasonically dispersing uniformly to obtain carbon nano tube suspension, dissolving chitosan having a deacetylation degree of 85% in acetic acid solution, and stirring to obtain chitosan acetic acid solution, adding graphene oxide to deionized water and dispersing uniformly to obtain aqueous solution of graphene oxide, adding the titanium dioxide dispersion, carbon nanotube suspension and chitosan acetic acid solution to the aqueous graphene oxide solution, adding cetyltrimethylammonium bromide, methacryloyloxyethyltrimethylammonium chloride, crosslinking agent and pore former, ultrasonically dispersing, vigorously stirring to react, and spray drying the reaction solution at a feed rate of 10-20 ml/minute. USE - The method is useful for preparing graphene modified composite porous microsphere air purifying agent. ADVANTAGE - The method: is environmentally friendly and simple. The microsphere air purifying agent: comprises uniformly dispersed graphene oxide, has large micro-specific surface area, high adsorption ability and good air purification effect. DETAILED DESCRIPTION - Preparing graphene modified composite porous microsphere air purifying agent comprises (a) adding titanium dioxide into deionized water, performing ultrasonic treatment for 12-24 hours to obtain 1-2 wt.% titanium dioxide dispersion, (b) mixing carbon nanotube with absolute ethyl alcohol, ultrasonically dispersing uniformly to obtain 0.5-2 wt.% carbon nano tube suspension, (c) dissolving chitosan having a weight average molecular weight of 50000-100000 and a deacetylation degree of 85% in 2 wt.% acetic acid solution, and stirring for 2-3 hours to obtain chitosan acetic acid solution, (d) adding graphene oxide to deionized water and dispersing uniformly for 1-2 hours to obtain 5-10 wt.% aqueous solution of graphene oxide, (e) adding the titanium dioxide dispersion, carbon nanotube suspension and chitosan acetic acid solution to the aqueous graphene oxide solution, then adding cetyltrimethylammonium bromide, methacryloyloxyethyltrimethylammonium chloride, crosslinking agent and pore former, ultrasonically dispersing for 30-60 minutes, and vigorously stirring to react for 6-8 hours, and (g) spray drying the reaction solution at an inlet temperature of 120-140 degrees C and a feed rate of 10-20 ml/minute to obtain composite porous microspheres.