烟用醋酸纤维素基超轻气凝胶的构筑及表征OA

[Objective]To achieve the resource valorization of cellulose acetate(CA)from cigarette butts by converting it into high value-added materials,and to investigate its structural and performance characteristics.[Methods]Recycled cellulose acetate(R-CA)was prepared via solvent washing.R-CA was then converted into nanofibers by electrospinning,and further fabricated into aerogels in one step through freeze-drying.The structure and properties of the R-CA nanofiber membranes and corresponding aerogels were characterized by Fourier transform infrared spectroscopy(FTIR),thermogravimetric analysis(TGA),and differential scanning calorimetry(DSC).[Results]R-CA exhibited a similar chemical structure to commercial CA,with similar peak thermal degradation temperatures of 355.0℃and 357.5℃,respectively.This indicates that the purification process did not alter the molecular structure or thermal properties of R-CA.With increasing R-CA electrospinning concentration,the fiber morphology evolved from beaded structures to uniform and smooth nanofibers.The fibers obtained at 17%concentration showed the most uniform diameter distribution,with an average diameter of 336.8 nm.Nanofibers prepared at this optimal concentration were subjected to dispersion,homogenization,and freeze-drying to successfully form a 3D network aerogel.The aerogel had an apparent density of 8.59～11.55 mg/cm3 and a porosity above 99%,showing ultra-low density and high porosity.[Conclusion]This study enables the efficient recovery of R-CA and the preparation of high-performance aerogels,offering a valuable reference for the resource valorization of cigarette butts.