| Abstract:Using the dissolution regeneration method, cellulose hydrogel is prepared. Under alkaline conditions as a catalyst, the hydrolysis-condensation rate of tetraethyl orthosilicate (TEOS) is controlled to regulate the size of the generated SiO2 particles. This allows for the composite of cellulose and SiO2, which is then freeze-dried to obtain a composite aerogel. After hydrophobic modification with alkyl siloxane, a superhydrophobic oleophilic cellulose composite aerogel is produced. Structural characterization is conducted using Fourier-transform infrared spectroscopy (FT-IR), while scanning electron microscopy (SEM) and a physical adsorption analyzer (DET) analyze the microstructure and Pore structure of the composite aerogel. Wetting performance and oil adsorption capacity of the modified composite aerogel are also tested. The results indicate successful SiO2 incorporation into the cellulose aerogel, with a porous structure. At a pH of 10, the SiO2 protruSiOns have a size range of 50-200 nm, a contact angle of 158.9°, and a roll-off angle of 3.2°. Its oil absorption capacity is 12.8 times its own weight. |