Bottom‐Up Ecofriendly Strategy for Construction of Sustainable Bacterial Cellulose Bioaerogel with Multifunctional Properties

Abstract The production of sustainable bioaerogel by using renewable biomass via eco‐friendly techniques is a meaningful research topic. This study reports a facile bottom‐up green strategy to construct dimensionally stable bioaerogel derived from bacterial cellulose (BC). Taking advantages of the natural hierarchical and interconnected network structure of BC, the preparation of bioaerogel comprises directional freezing, followed by freeze‐drying approach. Aside from the multifunctional characteristics such as high porosity, low density, and large specific surface area, the resultant BC bioaerogels show superhydrophilic property, excellent water absorption, and swelling characteristics. In addition, the extremely compressed bioaerogel film exhibits flexibility and good mechanical properties. And the BC bioaerogels display a low coefficient of thermal conductivity (25.8 mW m −1 K −1 ). Moreover, the BC bioaerogels reveal excellent sound absorption at board frequencies from 200 to 6000 Hz with a maximum sound‐absorption coefficient of 0.97. The BC bioaerogel is further used as the green, sustainable, and degradable cigarette filter tip, exhibiting good adsorption effect for the smoke main components. In summary, this study provides a feasible solution to rationally construct lightweight, high porous, heat‐insulating, and highly efficient sound‐adsorption BC bioaerogel, which has potential applications in the future as green advanced functional materials.