Yao Zhi, Xia Ming, Xiong Ziyin, Wu Yi, Cheng Pan, Cheng Qin, Xu Jia, Wang Dong, Liu Ke
Key Laboratory of Textile Fiber and Products, Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China.
School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, China.
ACS Omega. 2022 Jan 12;7(3):3030-3036. doi: 10.1021/acsomega.1c06114. eCollection 2022 Jan 25.
In this article, we reported a hierarchical structure of flower-like zinc oxide (ZnO) and poly(vinyl alcohol--ethylene) (PVA--PE) nanofiber (ZnO@NF) hybrid membranes for high-performance air filters. Monodispersed flower-like ZnO superstructures were fabricated using a template-free and surfactant-free hydrothermal method, and PVA--PE nanofiber yarns were prepared using a melt extrusion phase separation approach. The PVA--PE nanofiber yarns were subjected to high-speed shearing in a mixed aqueous solution of isopropanol and water to obtain a stably dispersed nanofiber suspension. The ZnO@NF hybrid air filter was obtained by coating the mixture of flower-like ZnO superstructures and the PVA--PE nanofiber suspension on the surface of the polypropylene (PP) meltblown nonwoven with the electret charge eliminated. The filtration efficiency of the ZnO@NF hybrid air filter increases with increasing loading amount of the flower-like ZnO superstructures, while the pressure drop decreases. The flower-like ZnO superstructures were incorporated into the nanofiber-interconnected networks, which significantly reduces the pressure drop of the pure PVA--PE nanofiber air filter. The filtration efficiency of the ZnO@NF hybrid air filter is much higher than that of PP meltblown nonwoven with eliminated electret charge, solving the hidden problem of electret charge dissipation during the protection process. It is demonstrated that these nanofiber hybrid air filters have great application potential in some special areas such as high-temperature and high-humidity environments.
在本文中，我们报道了一种用于高性能空气过滤器的花状氧化锌（ZnO）与聚乙烯醇-乙烯（PVA-PE）纳米纤维（ZnO@NF）杂化膜的层级结构。采用无模板、无表面活性剂的水热法制备了单分散花状ZnO超结构，并使用熔体挤出相分离法制备了PVA-PE纳米纤维纱线。将PVA-PE纳米纤维纱线在异丙醇和水的混合水溶液中进行高速剪切，以获得稳定分散的纳米纤维悬浮液。通过将花状ZnO超结构与PVA-PE纳米纤维悬浮液的混合物涂覆在已消除驻极体电荷的聚丙烯（PP）熔喷非织造布表面，得到ZnO@NF杂化空气过滤器。ZnO@NF杂化空气过滤器的过滤效率随着花状ZnO超结构负载量的增加而提高，同时压降降低。花状ZnO超结构被纳入纳米纤维互连网络中，这显著降低了纯PVA-PE纳米纤维空气过滤器的压降。ZnO@NF杂化空气过滤器的过滤效率远高于已消除驻极体电荷的PP熔喷非织造布，解决了保护过程中驻极体电荷消散的隐患问题。结果表明，这些纳米纤维杂化空气过滤器在高温高湿环境等一些特殊领域具有巨大的应用潜力。
