Under the promotion of sustainability, aerogels derived from bagasse have been developing. The reported bagasse aerogels are normally prepared by the treatment of bagasse with dissolution and regeneration or the removal of hemicellulose and lignin, and their hydrophobicity is achieved by silanes, leading to complicated and even environmental-unfriendly processes. In this report, we designed a novel, green and facile technique to prepare hydrophobic bagasse aerogels by milling of bagasse, mixing with alkyl ketene dimer (AKD) emulsion, freeze drying and thermo-crosslinking. Interestingly, AKD behaved as strength agent to endow aerogels with lower density, higher porosity, and better strength in comparison with the pristine bagasse aerogel. Increasing AKD or slurry concentration, their density and porosity displayed an increase and decrease tendency, respectively, resulting in a normal distribution of their oil absorption properties. Optimal hydrophobic bagasse aerogel was obtained at an AKD content of 10 wt% and slurry consistency of 3 wt%, whose density, porosity and water contact angle was 47.3 mg cm^–3, 95.9 % and 148 °, respectively. It exhibited a high oil absorption capacity (31.65 g g^–1) and a low thermal conductivity (36.28 mW m^–1K^–1), which could be applied for oil/water or emulsion separation and thermal insulation. The fabrication method would provide a novel idea for other bio-based hydrophobic aerogels.

在可持续性的推动下，甘蔗渣衍生的气凝胶得到了发展。报道的甘蔗渣气凝胶通常是通过对甘蔗渣进行溶解和再生或去除半纤维素和木质素来制备的，它们的疏水性是通过硅烷实现的，导致工艺复杂甚至不环保。在本报告中，我们设计了一种新颖、绿色且简便的技术，通过研磨甘蔗渣、与烷基乙烯酮二聚体 (AKD) 乳液混合、冷冻干燥和热交联来制备疏水性甘蔗渣气凝胶。有趣的是，与原始甘蔗渣气凝胶相比，AKD 作为强度剂赋予气凝胶更低的密度、更高的孔隙率和更好的强度。增加AKD或浆液浓度，其密度和孔隙率呈增减趋势，分别导致它们的吸油特性呈正态分布。在 AKD 含量为 10 wt% 和浆料稠度为 3 wt% 时获得最佳疏水甘蔗渣气凝胶，其密度、孔隙率和水接触角为 47.3 mg cm^–3、 95.9 % 和 148 ° 分别。它表现出高吸油能力 (31.65 gg ^–1 ) 和低热导率 (36.28 mW m ^–1 K ^–1 )，可用于油/水或乳液分离和隔热。该制造方法将为其他生物基疏水气凝胶提供新的思路。