Developing high performance and recyclable sorbent through a facile, low-cost, and eco-friendly way is quite important for oily wastewater treatment. Among the various fabrication approaches developed so far, the one using biomass waste as starting materials is particularly attractive in view of the cost and environmental benignity. Herein, a magnetic chitosan/typha orientalis fibers aerogel (MCS/TOFs) with excellent elasticity and superhydrophobicity was facilely prepared through freeze-drying and subsequent low-temperature annealing of biomass fibers (typha orientalis fibers, TOFs), chitosan (CS), and FeO nanoparticles. Benefiting from the 3D interconnected porous structure, superhydrophobic-lipophilic surface, and capillary effect of TOFs, the MCS/TOFs aerogel exhibited excellent sorption performance including fast sorption speed (few second to achieve saturation), high sorption capacity (up to 88.4 g/g), large flux (2.2 × 10 L m h), and high separation efficiency (98.4%). Additionally, the MCS/TOFs aerogel can be facilely separated from the solution phase by a magnet at the end of the sorption process. After removal of the adsorbate by extrusion, the recovered MCS/TOFs can be used for next separation cycle, delivering high sorption capacity retention (> 91% of the initial capacity) after ten sorption-extrusion cycles. This work provides a facile biomass-based approach to high-performance and recyclable sorbent for oily wastewater treatment, exhibiting great potential in practical applications.

中文翻译：

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将壳聚糖和生物质纤维转化为可回收的超疏水气凝胶，通过简便、绿色的方法实现高效的油/水分离

通过简便、低成本、环境友好的方式开发高性能、可回收的吸附剂对于含油废水处理非常重要。在迄今为止开发的各种制造方法中，考虑到成本和环境友好性，使用生物质废物作为起始材料的方法特别有吸引力。在此，通过冷冻干燥和随后的低温退火生物质纤维（香蒲纤维，TOF），壳聚糖（CS）和磁性壳聚糖/香蒲纤维气凝胶（MCS/TOF），具有优异的弹性和超疏水性Fe3O纳米颗粒。受益于TOF的3D互连多孔结构、超疏水亲油表面和毛细管效应，MCS/TOFs气凝胶表现出优异的吸附性能，包括吸附速度快（几秒即可达到饱和）、吸附容量高（高达88.4 g/g） ）、通量大（2.2×10 L mh）、分离效率高（98.4%）。此外，MCS/TOFs 气凝胶可以在吸附过程结束时通过磁铁轻松地与溶液相分离。通过挤出去除吸附物后，回收的 MCS/TOF 可用于下一个分离循环，在十次吸附-挤出循环后提供高吸附容量保留率（> 初始容量的 91%）。这项工作为含油废水处理提供了一种基于生物质的简便的高性能和可回收吸附剂方法，在实际应用中表现出巨大的潜力。