The development of efficient and sustainable strategies for resource utilization of waste plastic is great of urgency, since waste plastic is a global environmental problem that poses problems in ecosystem services and sustainable development. Herein, this work provided a novel method to fabricate a three-dimensional porous aerogel membrane derived from waste aramid nanofiber and application in Tween80-stabilized oil-in-water emulsions separation. The dispersed aramid nanofiber, as model waste plastic, was obtained via abstracting the mobile hydrogen from the amide groups using a KOH/DMSO system. Then, the aerogel membrane was fabricated via combining solvent replacement and freeze-drying route. The three-dimensional sponge-like porous aerogel membrane, composed of interconnected nanofibers, has greatly improved emulsion separation efficiency due to the micropore size, high porosity, and special wettability. The contact angle results indicate the high superhydrophilic/underwater superoleophobic property of aerogel membrane, which was used for oil/water separation experiments driven solely by gravity, exhibiting an emulsion separation efficiency of 98.1% with permeances up to 1940 Lm^-2h^-1. Most importantly, the aerogel membrane still maintains high separation efficiency of over 98.0% after 10 subsequent cycles, implying its outstanding recyclability. This work not only provides a resource utilization strategy for fabricating functional materials by using waste plastic as raw materials but gives a feasible chemical separation material in efficient emulsion separation.

由于废塑料是一个全球性的环境问题，对生态系统服务和可持续发展构成了问题，因此制定有效和可持续的废塑料资源利用策略迫在眉睫。在此，这项工作提供了一种新的方法来制备源自废弃芳纶纳米纤维的三维多孔气凝胶膜，并在 Tween80 稳定的水包油乳液分离中的应用。分散的芳纶纳米纤维作为模型废塑料，是通过使用 KOH/DMSO 系统从酰胺基团中提取流动氢而获得的。然后，通过溶剂置换和冷冻干燥相结合的方法制备气凝胶膜。由相互连接的纳米纤维组成的三维海绵状多孔气凝胶膜，由于微孔尺寸、高孔隙率和特殊的润湿性，大大提高了乳化分离效率。接触角结果表明气凝胶膜具有高超亲水/水下超疏油特性，用于仅由重力驱动的油/水分离实验，乳液分离效率为 98.1%，渗透率高达 1940 Lm^-2小时^-1。最重要的是，气凝胶膜在连续10次循环后仍保持98.0%以上的高分离效率，表明其具有出色的可回收性。这项工作不仅为以废塑料为原料制备功能材料提供了一种资源利用策略，而且为高效乳液分离提供了一种可行的化学分离材料。