Hydrophobic modification of wheat straw based flame retardant aerogel

Utilizing the pre-prepared wheat straw (WS)-based flame retardant aerogel as a foundation, composited aerogels (CAs) were crafted through a process of directional freeze-drying. Subsequently, the hydrophobic modification of these CAs was carried out under varying conditions to assess their adsorption capabilities. The findings revealed that the CAs prepared under directional freezing conditions exhibited a more uniform pore size structure, greatly favoring the hydrophobic modification process. Post-modification, the CAs underwent a transition from hydrophilic to hydrophobic properties. The maximum adsorption rate of the modified aerogel to waste oil is 74.94 g.g(-1), and the maximum removal rate of methylene blue is 98.64 %. All components of WS are used without prior separation, saving a lot of time and cost. And by hydrophobic modification, the WS based CAs has both flame retardant and hydrophobic properties in this research. This research had broadened the application prospects of the raw materials, paving the way for potential applications in the field of adsorption and purification.