Highly efficient, dual-functional self-assembled PET-based filters for removal of particulate matters and bacteria
With the rapid advancement of urbanization, individuals spend over 90 % of their time in indoor environments, where prolonged exposure to indoor air pollutants particularly particulate matters (PMs) poses significant health risks. This highlights the urgent need to develop advanced fiber-based filtration systems that simultaneously exhibit high filtration efficiency and antimicrobial properties. In this study, a multifunctional ZIF-8@PET/CA-PP composite filter material was fabricated using commercial PET membranes as substrates via a combination of electrostatic spraying and self-assembly techniques. The resulting material features a surface-functionalized CA/ZIF-8/PVDF-HFP composite layer. Comprehensive characterization revealed that the optimized filter material achieves exceptional PM2.5 filtration efficiency of 98.52 % (±0.72 %) with a low air resistance of only 57 Pa, while demonstrating antibacterial rates of 93.75 % against Escherichia coli ( E. coli ) and 94.2 % against Staphylococcus aureus ( S. aureus ). The outstanding performance can be attributed to two key factors: (1) the uniform dispersion and dense nanostructure of the functional layer significantly enhances particle capture capacity through combined mechanical and electrostatic filtration mechanisms; (2) the incorporated ZIF-8 nanoparticles provide effective antimicrobial activity by disrupting microbial membranes. Further validation through X-ray micro-CT scanning simulations confirmed the filter material's structural integrity and consistent filtration performance across varying airflow velocities. The ZIF-8@PET/CA-PP composite filter material developed in this work represents a promising candidate for next-generation air filtration applications, offering an optimal combination of low air resistance, high filtration efficiency, and robust antimicrobial properties. These advantages position the material as particularly suitable for improving indoor air quality in urban environments.
危险品化学品经营许可证（带存储）