A Study on the Filtration Performance of NH ₂ -MIL-53/Chitosan-Modified Paper-Based Functional Materials against Airborne Particulate Matter

In response to the pollution of airborne inhalable particulate matter (PM) and the demand for high-efficiency, low-resistance filtration materials, this study prepared a CS/NP-2.5 paper-based filter by incorporating NH₂-MIL-53 into pulp fibers and introducing chitosan (CS) as a carrier. Characterization results show that the composite material forms a complex three-dimensional network structure, significantly enhancing PM capture efficiency. The removal rates for PM_2.5 and PM₁₀ reached 98.41% and 99.05%, respectively, with a pressure drop of only 24.10 Pa, which is an improvement of approximately 7% compared to the directly doped NP-2.5 (PM_2.5 removal rate of 91.57%). CS enhanced the loading stability of the MOFs on the fibers; after 10 cycle tests, the filtration efficiency was still maintained above 94%, demonstrating excellent reusability. This study, through green synthesis and functional synergy, provides a new approach for the design of high-efficiency paper-based filtration materials.