In situ silver-loaded cellulose for high-strength antibacterial composite air filtration paper

Air filtration materials have become a focal point due to the increasing concern over global air pollution. However, it remains challenging to achieve an optimal balance between reliable filtration performance and superior mechanical strength, particularly across diverse applications. Herein, a novel composite air filter paper was designed by integrating hardwood pulp and glass fiber through a straightforward paper-making process. Our findings indicate that the incorporation of hardwood pulp enhanced the tensile strength of the composite paper, achieving a tensile index of 15.22 N m/g, while simultaneously maintaining commendable filtration performance, as evidenced by a quality factor of 2.15 Pa-1. Furthermore, the in-situ growth of silver nanoparticles (AgNPs) endowed the composite paper with stable antibacterial properties, as demonstrated by inhibition zones measuring 1.52 mm and 2.04 mm against E. coli and S. aureus, respectively. The favorable mechanical, filtration, and antibacterial properties, make this composite paper an ideal candidate for practical applications across various scenarios. Our research establishes a solid foundation for further advancements in antimicrobial filtration, highlighting the potential of cellulose-based materials in air purification as a viable strategy for combating air pollution and protecting human health.