Huang Zhongyuan, Dang Chao, Sun Zhaoxia, Qi Haisong
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, GuangZhou 510641, China.
ACS Appl Mater Interfaces. 2021 Dec 8;13(48):57921-57929. doi: 10.1021/acsami.1c17052. Epub 2021 Nov 19.
Particulate matter (PM) in air has seriously endangered human health. Especially, PM0.3 can easily enter the lungs and blood through breathing. Herein, an air filter with a three-dimensional (3D) network consisting of core-shell structured fibers was designed by in situ growth of zeolitic imidazolate framework-8 on tunicate nanocellulose/glass fiber composite filter media (ZIF-8@TNC/GF). The filtration performance of the obtained ZIF-8@TNC/GF membranes against sodium chloride particles with the MPPS (most penetrating particle size) was investigated. The air filter media at the optimal ratio of ZIF-8 exhibited an ultrahigh efficiency of 99.998% and a quality factor of 0.0308 Pa for PM0.3. Further characterizations showed that the ZIF-8@TNC/GF air filter had a hierarchical and rich pore structure, showing a large specific surface area (50.3 m g). More significantly, compared with the TNC/GF prepared by the dipping method, TNCs changed from the original two-dimensional (2D) nonuniform network to a uniform 3D network after the ZIF-8 was introduced. Moreover, the ZIF-8@TNC fibers with a core-shell structure inhibited the aggregation of nanocellulose. This study will shed light on the fabrication of high-efficiency TNC composite air filter media with fluffy 3D networks.
空气中的颗粒物（PM）已严重危害人类健康。特别是，PM0.3可通过呼吸轻松进入肺部和血液。在此，通过在被囊动物纳米纤维素/玻璃纤维复合过滤介质（ZIF-8@TNC/GF）上原位生长沸石咪唑酯骨架-8，设计了一种具有由核壳结构纤维组成的三维（3D）网络的空气过滤器。研究了所得ZIF-8@TNC/GF膜对具有最穿透粒径（MPPS）的氯化钠颗粒的过滤性能。ZIF-8最佳比例的空气过滤介质对PM0.3表现出99.998%的超高效率和0.0308 Pa的品质因数。进一步表征表明，ZIF-8@TNC/GF空气过滤器具有分级且丰富的孔结构，比表面积大（50.3 m²/g）。更重要的是，与通过浸渍法制备的TNC/GF相比，引入ZIF-8后，TNCs从原来的二维（2D）不均匀网络转变为均匀的3D网络。此外，具有核壳结构的ZIF-8@TNC纤维抑制了纳米纤维素的聚集。本研究将为制备具有蓬松3D网络的高效TNC复合空气过滤介质提供启示。
