▎ 摘　　要

NOVELTY - Preparing metal organic frameworks (MOFs) load gas gel comprises (i) adding microcrystalline cellulose into concentrated sulfuric acid with mass concentration of 50-65%, (ii) taking the nano-cellulose uniformly dispersed into water under the condition of slowly stirring at room temperature, the mass fraction of the nano-cellulose in the water is 0.01-0.02%, adding polyethyleneimine to the nano-cellulose dispersion solution, (iii) ultrasonically dispersing the graphene oxide into water to obtain graphene oxide dispersion, (iv) pouring the suspension into a pre-prepared mold, performing freeze-drying treatment at low temperature, freezing and drying to obtain the modified nano cellulose/graphene oxide composite aerogel, and (v) adding zirconium chloride into N, N-dimethylformamide, adding trimellitic acid and acetic acid at room temperature, uniformly mixing, placing the mixed solution in the reaction kettle for in-situ synthesis reaction, and taking out the composite aerogel. USE - The gel is useful for absorbing volatile organic compounds (VOCs). ADVANTAGE - The aerogel has improved porosity, increased specific surface area, distributed a large number of functional groups, and significantly improved VOCs adsorption performance, achieves rapid and reversible absorption of a large amount of VOCs exhaust gas to cope with the increasingly severe VOCs pollution problem. DETAILED DESCRIPTION - Preparing metal organic frameworks (MOFs) load gas gel comprises (i) adding microcrystalline cellulose into concentrated sulfuric acid with mass concentration of 50-65%, where the mass fraction of microcrystalline cellulose in concentrated sulfuric acid is 10-15%, hydrolyzing for 1-2 hours under the condition of continuously stirring at 40-60degrees Celsius, adjusting pH to 6-7 by de-ionized water to obtain suspension, orderly separating, washing and drying to obtain the nano cellulose, (ii) taking the nano-cellulose uniformly dispersed into water under the condition of slowly stirring at room temperature, the mass fraction of the nano-cellulose in the water is 0.01-0.02%, adding polyethyleneimine to the nano-cellulose dispersion solution, after high speed stirring for 30-60 minutes, dropping a certain amount of grafting modifier into the solution for Schiff base reaction for 3-5 hours, using equal amount of water to wash and solvent replacement to obtain the modified nano cellulose aqueous solution, where the mass ratio of the nano cellulose, polyethylene imine, graft modifier is 1:(1.2-1.5):(0.15-0.20), (iii) ultrasonically dispersing the graphene oxide into water to obtain graphene oxide dispersion, the mass fraction of the graphene oxide dispersion is 10-20%, mixing the modified nano-cellulose water solution with the graphene oxide dispersion liquid, the volume ratio of graphene oxide dispersion liquid and modified nano-cellulose water solution is 1: (100-110), gradually adding antioxidant water solution, the mass concentration of the antioxidant in the mixed solution is 0.01-0.015%, adjusting the pH to 8-9 using aqueous ammonia, crosslinking and assembling for 2-3 hours at 80-95degreesC, respectively equal amount of water and absolute ethyl alcohol for solvent exchange to obtain the modified nano-cellulose/graphene oxide suspension, (iv) pouring the suspension into a pre-prepared mold, performing freeze-drying treatment at low temperature, freezing and drying to obtain the modified nano cellulose/graphene oxide composite aerogel, (v) adding zirconium chloride into N, N-dimethylformamide, the mass fraction of zirconium chloride in N, N-dimethyl formamide is 0.1-0.2%, stirring for 1-2 hours at 50-60degrees Celsius, soaking the composite aerogel into the solution for 12-24 hours, adding trimellitic acid and acetic acid at room temperature, the mol ratio of zirconium chloride, trimellitic acid and acetic acid is 1:1: (24-48), uniformly mixing, placing the mixed solution in the reaction kettle for in-situ synthesis reaction, taking out the composite aerogel, orderly using N, N-dimethyl formamide and water to wash, and drying at normal temperature.