新冠病毒肺炎（COVID-19）疫情已导致全球对口罩的需求激增。然而，口罩的大量消耗也引起人们对环境污染和资源浪费问题的担忧。本研究制备了一种基于聚丙烯熔喷布（mb-PP）的高性能可重复使用平面口罩，并测试了6 种常用消毒方法和口罩佩戴时长对其可重复使用性能的影响。结果表明，使用其中最易行的消毒方法（70 ℃热水浸泡30 min）进行三个消毒循环处理后，口罩的颗粒过滤效率（PFE）几乎不变。进一步研究表明，对于佩戴时长累计达24 h 并经三次热水消毒法处理后的口罩，其PFE 仍高达91.3%，平均细菌检出菌落数和真菌检出菌落数分别为9.2 CFU∙g⁻¹和51.6 CFU∙g⁻¹，未检出大肠杆菌和化脓性致病菌，口罩的滤效和微生物指标均优于《可重复使用民用口罩》的团体标准（T/B JFX 0001—2020）。此外，纹影摄影技术对在佩戴口罩过程中气流散播范围的研究也表明，经佩戴和消毒处理后的可重复使用口罩仍可高效降低呼出气体的散播范围。

The coronavirus disease 2019 (COVID-19) pandemic has caused a surge in demand for face masks, with the massive consumption of masks leading to an increase in resource-related and environmental concerns. In this work, we fabricated meltblown polypropylene (mb-PP)-based high-performance planar face masks and investigated the effects of six commonly used disinfection methods and various mask-wearing periods on the reusability of these masks. The results show that, after three cycles of treatment using hot water at 70 °C for 30 min, which is one of the most scalable, user-friendly methods for viral disinfection, the particle filtration efficiency (PFE) of the mask remained almost unchanged. After mask wearing for 24 h and subsequent disinfection using the same treatment procedures, the PFE decreased to 91.3%; the average number of bacterial and fungal colonies was assessed to be 9.2 and 51.6 colony-forming units per gram （CFU∙g⁻¹）, respectively; and coliform and pyogenic bacteria were not detected. Both the PFE and the microbial indicators are well above the standard for reusable masks after disinfection. Schlieren photography was then used to assess the capabilities of used and disinfected masks during use; it showed that the masks exhibit a high performance in suppressing the spread of breathed air.