Here, we report the fabrication of nanofibrous air-filtration membranes of intrinsically microporous polyimide with metal–organic frameworks (MOFs). The membranes successfully captured VOCs from air. Two polyimides with surface areas up to 500 m² g⁻¹ were synthesized, and the impact of the porosity on the sorption kinetics and capacity of the nanofibers were investigated. Two Zr-based MOFs, namely pristine UiO-66 (1071 m² g⁻¹) and defective UiO-66 (1582 m² g⁻¹), were embedded into the nanofibers to produce nanocomposite materials. The nanofibers could remove polar formaldehyde and non-polar toluene, xylene, and mesitylene from air. The highest sorption capacity with 214 mg g⁻¹ was observed for xylene, followed by mesitylene (201 mg g⁻¹), toluene (142 mg g⁻¹), and formaldehyde (124 mg g⁻¹). The incorporation of MOFs drastically improved the sorption performance of the fibers produced from low-surface-area polyimide. Time-dependent sorption tests revealed the rapid sequestration of air pollutants owing to the intrinsic porosity of the polyimides and the MOF fillers. The porosity allowed the rapid diffusion of pollutants into the inner fiber matrix. The molecular level interactions between VOCs and polymer/MOFs were clarified by molecular modeling studies. The practicality of material fabrication and the applicability of the material were assessed through the modification of industrial N95 dust masks. To the best of our knowledge, this is the first successful demonstration of the synergistic combination of intrinsically microporous polyimides and MOFs in the form of electrospun nanofibrous membranes and their application for VOC removal.

在这里，我们报告了具有金属有机框架（MOF）的本质微孔聚酰亚胺的纳米纤维空气过滤膜的制造。该膜成功地捕获了空气中的 VOC。合成了两种表面积高达500 m ² g ^{-1 的}聚酰亚胺，并研究了孔隙率对纳米纤维吸附动力学和容量的影响。两种基于 Zr 的 MOF，即原始 UiO-66 (1071 m ² g ^-1 ) 和有缺陷的 UiO-66 (1582 m ² g ^-1 )，被嵌入纳米纤维中以生产纳米复合材料。纳米纤维可以去除空气中的极性甲醛和非极性甲苯、二甲苯和均三甲苯。214 mg g 的最高吸附容量观察到二甲苯为^-1，其次是均三甲苯 (201 mg g ^-1 )、甲苯 (142 mg g ^-1 ) 和甲醛 (124 mg g ^-1）。MOF 的加入大大提高了由低表面积聚酰亚胺制成的纤维的吸附性能。时间相关的吸附测试表明，由于聚酰亚胺和 MOF 填料的固有孔隙率，可以快速隔离空气污染物。孔隙率允许污染物快速扩散到内部纤维基质中。VOCs 和聚合物/MOFs 之间的分子水平相互作用通过分子模型研究得到澄清。通过对工业N95防尘口罩的改造，评估材料制作的实用性和材料的适用性。据我们所知，