Wang Qibin, Shao Zungui, Deng Changzhuo, Li Jingxun, Zhang Shihan, Pan Sihang, Chen Ruixin, Zheng Gaofeng, Liu Yifang
Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China.
Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China.
Int J Biol Macromol. 2025 Jul;318(Pt 3):145202. doi: 10.1016/j.ijbiomac.2025.145202. Epub 2025 Jun 13.
The preparation of electrospinning air filtration membranes based on fully bio-based materials is the key to alleviate the energy and environmental crises. However, for the lack of reasonable materials matching and structural design strategies, it is difficult to balance the mechanical and filtration properties of bio-based fiber membranes. In this study, ethyl cellulose (EC)/chitosan (CS) bimodal nanofiber membrane was prepared by one-step electrospinning. In detail, EC was intended to construct a low binding energy system while CS was introduced to enhance split. And the ethanol and water were used as solvents. More importantly, the "internal-external synergistic enhancement strategy" was proposed creatively: on the one hand, the hydrogen bonding was enhanced for the incorporation of CS; on the other hand, bonding structures were formed among the fibers after the heating-annealing process, which was attributed to the melting and solidification of CS. The combination of hydrogen bonding and bonding structures dramatically improved the mechanical properties of the membrane. The elastic modulus and tensile strength of the 15EC/1.5CS membrane were 103.13 and 5.97 MPa. At 85 L/min, the filtration efficiency of 15EC/1.5CS membrane for PM was 99.01 %, the pressure drop was only 56.2 Pa, and the quality factor was 0.082 Pa.
制备基于全生物基材料的静电纺丝空气过滤膜是缓解能源和环境危机的关键。然而，由于缺乏合理的材料匹配和结构设计策略，难以平衡生物基纤维膜的机械性能和过滤性能。在本研究中，通过一步静电纺丝制备了乙基纤维素（EC）/壳聚糖（CS）双峰纳米纤维膜。具体而言，EC旨在构建一个低结合能体系，同时引入CS以增强分裂。并且使用乙醇和水作为溶剂。更重要的是，创造性地提出了“内外协同增强策略”：一方面，通过引入CS增强氢键；另一方面，在加热退火过程后，纤维之间形成了键合结构，这归因于CS的熔化和固化。氢键和键合结构的结合显著提高了膜的机械性能。15EC/1.5CS膜的弹性模量和拉伸强度分别为103.13和5.97MPa。在85L/min时，15EC/1.5CS膜对PM的过滤效率为99.01%，压降仅为56.2Pa，品质因数为0.082Pa。
