Rational Process Design for Facile Fabrication of Dual Functional Hybrid Membrane of MOF and Electrospun Nanofiber towards High Removal Efficiency of PM_2.5 and Toxic Gases

Abstract

The application of nanofiber (NF) and porous metal-organic framework (MOF) has increasingly attracted attention for the protection of public health. This composite platform provides the physical sieving of particulate matters (PMs) and capturing gases, serving as an outstanding filtering medium with lightweight and multifunctionality. Herein, process design and optimization are performed to produce a multifunctional membrane comprised NFs and MOF particles. Electrospinning/electrospray techniques are used to fabricate a hybrid membrane of poly(vinyl alcohol) NF and Fe-BTC as an adsorptive MOF on a macroporous nonwoven (NW). Three types of filters are prepared by varying the order of processing steps, that is, MOF/NF/NW, MOF+NF/NW, and NF/MOF/NW, to elucidate the effect of the fabrication process in the filtration of air pollutant. The optimal filtration performance is achieved in MOF+NF/NW system: the highest filtration efficiency (97%) and outstanding gas capturing efficiencies (≈60% and ≈35% decreases from initial NH 3 and H 2 S concentrations, respectively). However, when air permeability and filtration efficiency are considered, the most desirable configuration for personal protection equipment (PPE) is NF/MOF/NW system, which effectively enabled comfortable breathing without compromising the lightweight and multifunctional performance.

Mitigation Strategies of Air Pollutants for Mechanical Ventilated Livestock and Poultry Housing—A Review

“…The filter membranes prepared by EST feature several notable characteristics: controllable pore size distribution, good fiber uniformity, an adjustable structure, small pore size, high porosity, high filtration efficiency, and a low basic weight, making this an ideal air filtration technology [142]. A hybrid membrane of poly(vinyl alcohol) NF and Fe-BTC on a macroporous nonwoven material (MOF + NF/NW) was shown to achieve outstanding gas-capturing efficiencies at 100 ppm of NH 3 and H 2 S (≈60% and ≈35% from their initial concentrations, respectively) [136]. Electrospinning membranes have very high potential for filtering livestock barn inlet and outlet pollutants due to their excellent filtration performance.…”

Electrospray-on-Electrospun Breathable, Biodegradable, and Robust Nanofibrous Membranes with Photocatalytic Bactericidal Activity

“…Very recently, a dual-nozzle setup was used to introduce electrosprayed MOF into electrospun polymer nanofibers through varying the electrospinning/spray order. 56 As reported, the MOF had large aggregates with size of several micrometers due to its poor dispersion in a solvent for electrospraying. This likely limits its efficient functioning.…”

“…It was also deposited onto polyacrylonitrile, polystyrene, and polyethylene oxide nanofibers through the postsolution growth method. − Typically, MOF nanoparticles were embedded in the PLA nanofiber for applications like biomedicine, drug delivery, nanosensing, water treatment, and PM 2.5 capture. − Despite the above-stated PLA/MOF works that have been reported, the existing methods of introducing MOF into nanofibers still have some expected yet non-negligible issues: (1) the embedding of MOF in nanofibers largely limits the exposure of MOF nanoparticles and thus negatively affects the antibacterial and other contact-triggered properties, and (2) the postgrowth of MOF nanoparticles on nanofibers has limited controllability, leading to overdeposition, which blocks the pores within the membrane. Very recently, a dual-nozzle setup was used to introduce electrosprayed MOF into electrospun polymer nanofibers through varying the electrospinning/spray order . As reported, the MOF had large aggregates with size of several micrometers due to its poor dispersion in a solvent for electrospraying.…”

CuBTC Metal–Organic Framework Decorated with FeBTC Nanoparticles with Enhance Water Stability for Environmental Remediation Applications

“…FeBTC is composed of Fe­(II) units connected with BTC ligands. It has a pore dimension of 22 Å and a surface area of 1500 m 2 /g. , FeBTC is widely used in catalytic, , membrane filtering, water purification, and gas adsorption applications . Most importantly, it exhibits outstanding water stability .…”