Polypropylene/Polyvinyl Alcohol/Metal-Organic Framework-Based Melt-Blown Electrospun Composite Membranes for Highly Efficient Filtration of PM2.5

Abstract

Particulate matter 2.5 (PM2.5) has become a public hazard to people’s lives and health. Traditional melt-blown membranes cannot filter dangerous particles due to their limited diameter, and ultra-fine electrospinning fibers are vulnerable to external forces. Therefore, creating highly efficient air filters by using an innovative technique and structure has become necessary. In this study, a combination of polypropylene (PP) melt-blown and polyvinyl alcohol (PVA)/zeolite imidazole frameworks-8 (ZIF-8) electrospinning technique is employed to construct a PP/PVA/ZIF-8 membrane with a hierarchical fibrous structure. The synergistic effect of hierarchical fibrous structure and ZIF-8 effectively captures PM2.5. The PP/PVA composite membrane loaded with 2.5% loading ZIF-8 has an average filtration efficacy reaching as high as 96.5% for PM2.5 and quality factor (Qf) of 0.099 Pa−1. The resultant membrane resists 33.34 N tensile strength and has a low pressure drop, excellent filtration efficiency, and mechanical strength. This work presents a facile preparation method that is suitable for mass production and the application of membranes to be used as air filters for highly efficient filtration of PM2.5.

Bifunctional ZIF-8 Grown Webs for Advanced Filtration of Particulate and Gaseous Matters: Effect of Charging Process on the Electrostatic Capture of Nanoparticles and Sulfur Dioxide

“…Most gas/vapor filters employ porous materials such as activated carbon, porous metal oxides, and metal–organic frameworks (MOFs), and they perform by adsorbing gas molecules in the porous structure . Of particular, MOFs, composed of metal ions and organic linkers, attract great attention as an emerging adsorbent material, due to their extremely large surface area, functional tailorability, and easy synthesis. ,, Various fabrication methods have been explored to implement MOFs to fibrous material. − Solution dispersing or electrospraying MOF particles has been regarded as a simple way of introducing MOFs onto a fibrous substrate, ,− but the binding of MOFs by this method is often weak, leading to an easy detachment of particles. Another readily scalable method is to impregnate MOFs into fibers by adding MOFs into the prespinning melt or polymer solution. , However, in this method, MOFs are encapsulated in the fiber bulk at least partially, leading to an ineffective use of MOF’s pores and reactive sites.…”

Ionic Salts@Metal–Organic Frameworks: Remarkable Component to Improve Performance of Fabric Filters to Remove Particulate Matters from Air

“…Since CaCl 2 (20)@MIL-101/cotton showed very noticeable performances in PM removal, the competitiveness of this filter was compared with reported filters containing MOFs, as shown in Table . In Table , the quantity of loaded porous materials, PD, QF (for PM2.5), and face velocity are shown to compare the performance of CaCl 2 (20)@MIL-101/cotton with the early results. ,,,,,, So far, there are several results on PM removal with MOF-modified filters; however, many of the old reports could not be included in Table since the QFs were not provided or the experimental conditions were very different from those of this work. ,,− For example, FVs were quite different (usually 5.3 cm·s –1 or 5 m·s –1 ) ,,,,,− from that in this work (20 cm·s –1 ). The QF values, if obtained under different FVs, cannot be compared adequately because QF values rely on the FV.…”

Superwetting Electrospun PDMS/PMMA Membrane for PM2.5 Capture and Microdroplet Transfer

“…The blank control experiments without PDMS functional components have been added in Figure S4A. Compared with the filtration efficiency of the EPPM, the efficiency of the PMMA membrane did not have a significant drop under the usual conditions, while the air filtration performance of membranes should be judged by three key parameters including (a) filtration efficiency, (b) pressure drop, and (c) QF. , The pressure drop of the membrane of PMMA was almost twice that of EPPM, which decreased the QF (Figure S4B,C). From this work, the EPPM has been proved to still have high filtration efficiency under high humidity conditions.…”