Air pollution has presented an imminent threat to the world. Multifunctional filters with high filtration efficiency, low pressure drop, moisture resistance, antibacterial properties, and renewability are urgently needed to be developed. In this study, multifunctional wood filters are innovatively designed with a baffle structure combining macroscopic structural design and microscopic in-situ synthesis of silver nanoparticles (Ag NPs). The filter has excellent particle removal efficiency (PM0.3, 98.5 %), exceptional volatile organic compounds (VOCs) adsorption efficiency (98.4 % for formaldehyde and 91.7 % for xylene), high sterilization efficiency (99.99 %) and excellent regeneration ability (performance recovery to 98 % of the initial). Furthermore, personal protective masks were assembled by the prepared filters, whose process of replacing element is as simple as replacement of electric mosquito incense tablets. This innovative filter holds promise for applications such as daily protection, sudden accidents and prevention and control of respiratory infectious diseases. We envision that the functionally modified Ag NPs wood filters with a multilayer structure offer a comprehensive solution for more effective air purification in polluted environment.

中文翻译：

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多功能空气净化过滤器微纳挡板结构3D疏水木膜：“一箭三雕”


空气污染对世界构成了迫在眉睫的威胁。亟待开发具有高过滤效率、低压降、防潮、抗菌、可再生的多功能过滤器。本研究创新性地设计了多功能木质过滤器，其挡板结构结合了宏观结构设计和微观银纳米粒子（Ag NPs）的原位合成。该过滤器具有优异的颗粒去除效率（PM0.3，98.5%）、出色的挥发性有机化合物（VOC）吸附效率（甲醛98.4%、二甲苯91.7%）、高杀菌效率（99.99%）和优异的再生能力（性能恢复到初始的 98%）。此外，个人防护口罩是由准备好的过滤器组装而成，更换滤芯的过程就像更换电蚊香片一样简单。这种创新过滤器有望在日常防护、突发事故、呼吸道传染病防控等应用中发挥重要作用。我们预计，具有多层结构的功能改性银纳米颗粒木质过滤器可为污染环境中更有效的空气净化提供全面的解决方案。