Construction Of Regenerated Cellulose Air Filtration Materials And Performance Research Using High-speed Liquid Shear Syste

Air pollution is still a serious problem on the global scale,posing sever threat to every aspect of human life.As a result,the research and development of air filtration materials is significant to improve the environment of human’s living.Unfortunately,most of conventional air filters are made from unreproducible resources and also non-degradable,which would let the secondary pollution.Therefore,due to the brilliant properties such as biodegradable and renewable,cellulose resource exhibited the great potential in air filter production.In this study,the author prepared a filter material from bagasse parenchymal cellulose by using high-speed liquid phase shear strategy,which have multiple functions such as particulate matter filtration,volatile organic compound adsorption and bacterial barrier.The effect of high-speed liquid phase shear on the physical properties of regenerated cellulose was studied and discussed:By utilizing the high-speed liquid phase shear strategy,it is possible to obtain filament-like regenerated cellulose with a diameter ranging from 80-150 nm and 20-50μm.When combined with freeze-drying technology,the all-cellulose air filter material can achieve a maximum specific surface area of 22.129 m~2/g,resulting in particle filtration efficiency exceeding 91%for six different diameters.By simulating the flow state of the coagulation bath and calculating the binding energy of cellulose molecular chains,it was discovered that high shear induction during regeneration can align molecular chains in regenerated cellulose and impede transverse intermolecular hydrogen bond recombination.The resulting regenerated cellulose exhibits small size(200-500 nm),high crystallinity(83.23%),good thermal stability,and a unit density modulus of 0.056 N/mg.Through the solution blending method loaded withβ-cyclodextrin,the composite material exhibited excellent adsorption capacity towards p-xylene(22.83±3.34 mg/g),benzene(54.25±4.29mg/g)and formaldehyde(133.60±8.07 mg/g),as well as outstanding particulate matter filtration performance and extremely low air resistance(21 Pa).Moreover,after silanization treatment,the water contact angle of the composite material reached 122.12°,and it also demonstrated remarkable ability to effectively block bacteria carried by droplets.