Multiscale structured MOF-808@PVDF/DA fiber membranes with high filtration efficiency and long-term loading capacity for air-filtration applications

Existing air filtration materials suffer from short service life, limited load capacity, and lack of multifunctional properties such as chemical degradation resistance. To address these limitations, this study combined electrostatic-assisted solution blow spinning (E-SBS) with in situ growth of metal-organic frameworks (MOFs) to produce a scalable MOF-808@polyvinylidene fluoride/dopamine 2 (MOF-808@PVDF/DA2) micro/nanofiber composite membrane. The multiscale PVDF/DA micro-nanofiber composite membrane produced via electrostatic-assisted solution blow spinning exhibits small pore size (0.67 μm) and high porosity (92.23 %). Following dopamine (DA) modification and MOF-808 loading, the membrane exhibits outstanding filtration performance (filtration efficiency: 99.98 %, quality factor Q f : 0.129 Pa −1 ), long-term dust-holding capacity (dust-holding capacity up to 22.9 g m −2 ), and excellent catalytic degradation performance (98.7 % degradation rate within 30 min). Notably, the MOF-808@PVDF/DA2 membrane exhibits high air permeability (158 mm s −1 ), effectively reducing energy consumption during filtration. After multiple cycles of use, filtration efficiency remains as high as 98 %, demonstrating a long service life. This study proposes an innovative strategy for designing next-generation protective materials that integrate filtration and catalytic detoxification functions.