Department of Transportation and Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, China.
Department of Transportation and Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, China; School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, China.
J Hazard Mater. 2023 Apr 15;448:130954. doi: 10.1016/j.jhazmat.2023.130954. Epub 2023 Feb 7.
Bio-based aerogel has become an attractive sorbent for spilled oil and organic pollutants because of its light weight, high porosity and strong sorption capacity. However, the current fabrication process is mainly "bottom-up" technology, which is cost-expensive, time-consuming, and energy-intensive. Herein, we report a top-down, green, efficient and selective sorbent prepared from corn stalk pith (CSP) using the deep eutectic solvent (DES) treatment, followed by TEMPO/NaClO/NaClO oxidization and microfibrillation, and then hexamethyldisilazane coating. Such chemical treatments selectively removed lignin and hemicellulose, broke the thin cell walls of natural CSP, forming an aligned porous structure with capillary channels. The resultant aerogels had a density of 29.3 mg/g, a porosity of 98.13%, and a water contact angle of 130.5, exhibiting excellent oil/organic solvents sorption performance, with a high sorption capacity in the range of 25.4-36.5 g/g, approximately 5-16-fold higher than CSP, and with fast absorption speed and good reusability.
基于生物的气凝胶因其重量轻、孔隙率高和吸附能力强而成为一种有吸引力的溢油和有机污染物吸附剂。然而，目前的制造工艺主要是“自上而下”的技术，成本高、耗时、能源密集。在此，我们报告了一种自上而下、绿色、高效和选择性的吸附剂，它是由玉米秸秆髓（CSP）使用深共晶溶剂（DES）处理，然后进行 TEMPO/NaClO/NaClO 氧化和微纤维化，再进行六甲基二硅氮烷涂层制备而成。这种化学处理有选择性地去除木质素和半纤维素，打破了天然 CSP 的薄壁，形成具有毛细通道的定向多孔结构。所得气凝胶的密度为 29.3mg/g，孔隙率为 98.13%，水接触角为 130.5°，表现出优异的吸油/有机溶剂性能，在 25.4-36.5g/g 的范围内具有较高的吸附容量，约为 CSP 的 5-16 倍，且具有较快的吸收速度和良好的可重复使用性。
