Fabrication of Poly(Lactic Acid)@TiO2 Electrospun Membrane Decorated with Metal–Organic Frameworks for Efficient Air Filtration and Bacteriostasis

Abstract

The development of high-performance filtration materials is essential for the effective removal of airborne particles, and metal–organic frameworks (MOFs) anchored to organic polymer matrices are considered to be one of the most promising porous adsorbents for air pollutants. Nowadays, most air filters are generally based on synthetic fiber polymers derived from petroleum residues and have limited functionality, so the use of MOFs in combination with nanofiber air filters has received a lot of attention. Here, a conjugated electrostatic spinning method is demonstrated for the one-step preparation of poly(lactic acid) (PLA) nanofibrous membranes with a bimodal diameter distribution and the anchoring of Zeolitic Imidazolate Framework-8 (ZIF-8) by the introduction of TiO2 and in situ generation to construct favorable multiscale fibers and rough structures. The prepared PLA/TZ maintained a good PM2.5 capture efficiency of 99.97%, a filtration efficiency of 96.43% for PM0.3, and a pressure drop of 96.0 Pa, with the highest quality factor being 0.08449 Pa−1. Additionally, ZIF-8 was uniformly generated on the surface of PLA and TiO2 nanofibers, obtaining a roughened structure and a larger specific surface area. An enhanced filtration retention effect and electrostatic interactions, as well as active free radicals, can be generated for the deep inactivation of bacteria. Compared with the unmodified membrane, PLA/TZ prepared antibacterial characteristics induced by photocatalysis and Zn2+ release, with excellent bactericidal effects against S. aureus and E. coli. Overall, this work may provide a promising approach for the development of efficient biomass-based filtration materials with antimicrobial properties.

Plasma Surface Treatment and Application of Polyvinyl Alcohol/Polylactic Acid Electrospun Fibrous Hemostatic Membrane

“…PLA has good mechanical properties and biocompatibility and is widely used as a low-cost, non-toxic, and easily decomposable material [14]. PVA and PLA can be formed into composite fiber membranes by electrospinning, as an excellent matrix material for tissue repair [15][16][17][18][19][20]. Based on the high porosity and large specific surface area of electrospun fiber membranes, they also display promising applications in hemostasis Plasma is considered the fourth state of matter and contains many active species, (neutral particles, excited state radicals, photons, electrons, ions, and so on).…”

“…16, 1635 12 of 15 mechanical performance, and adhesion capacity of the PVA/PLA fiber membrane, enhancing the physical barrier effect for hemostasis.…”

Functionalization of PLA nanofibers with PCL blending and TiO2 nanoparticle addition

“…TiO 2 nanoparticles have significant interest due to their self-cleaning, low cost, and antibacterial characteristics. They are also highly adaptable to a wide range of applications, including but not limited to solar cells and tissue engineering [5,30,[41][42][43][44]. Their effectiveness is contingent upon the size, shape, phase, and physical characteristics of the individual particles within the matrix or on the surface of the materials [45].…”