Research On Preparation,Modification, Application Of Cellulose Aerogel

In recent years, many studies have already focused on aerogel materials because of their excellent properties. Cellulose is the most widely distributed and the most abundant biopolymer on earth. Moreover, it promises additional fascinating properities, including renewable and biodegradable. In this paper, in order to get the cellulose aerogel with better performance, cellulose hydrogel was prepared by using linter cellulose as main body, NaOH/H2O system as the solvent and the sol-gel method. The density and thermal conductivity of the cellulose aerogel were low to0.0484g/cm3and0.0196W/(m-K), respectively. The porosity of the cellulose aerogel was high to93.02%. The utilization efficiency of silica of the cellulose/silica composite aerogel via a dropwise manner was high to95%. The thermal stability and thermal insulation of cellulose aerogel was enhance by introduce silica, the thermal conductivity of the composite aerogel was low to0.0161W/(m-K), which was far lower than the value for the classical foam insulation material for refrigerators. The study also found that during the preparation of the cellulose-silica composite aerogels, removing NaOH in advance resulted in better properties, the thermal conductivity of the composite aerogel was low to0.018W/(m-K). The cellulose aerogels were better hydrophobically modified by in situ modification and silane coupling agent. The maximum peanut oil and vacuum pump oil absorption ratio were10.38g/g and8.51g/g, respectively. The thermal insulation of hydrophobic cellulose aerogel was still excellent and the thermal conductivity was low to0.02307W/(m-K). As a conclusion, the preparation process of cellulose aerogel was simplified, the thermal stability, thermal insulation and adsorption properties were enhance. This work promised the cellulose aerogel with a great potential in the field of low-temperature insulation and oil spill cleaning.