A multifunctional composite filter combined with nanocrystalline MnO2 and a PE/PP bicomponent fiber by introducing corona charge technology has been fabricated and exhibited excellent filtration, adsorption and catalytic abilities in air pollutant abatement.
Multifunctional air filters with high filtration efficiency for aerosol and good degradation for toluene and bacteria are fabricated via online incorporation of TiO2/Ag nanoparticles into the composite nonwovens with spun‐bonded/melt‐blown (SM) hierarchical structure. Today, severe environmental pollution attributed to atmospheric pollutants, mainly including particulate materials, and gaseous volatile organic compounds, as well as bacterial and viral contaminants, has drawn worldwide attention. In this work, a novel online incorporation technique to fabricate a multifunctional air filter with hierarchical structure of SM nonwovens and TiO2 based nanoparticles is proposed. The in situ incorporation technique not only enables the SM nonwovens filters with four orders increment on toluene degradation rate, but also increases filtration quality factor Qf of the SM filters to 0.2251 Pa−1. This research shows promising applications of the multifunctional TiO2/SM nonwoven filters for indoor air remediation. In addition, this scale‐up fabrication method of fiber‐based filters will potentially promote engineering of macromolecular fiber materials.
Nonwovens are widely applied in air filtration field for their multi-layered fibrous structures and inter-connected pores. Despite intensively used, conventional microfiber nonwovens usually suffer from low filtration efficiencies due to...
Nonwovens with anisotropic water-penetration properties
are of significant academic and practical importance. However, existing
materials suffer from inherent limitations, because of which the use
of chemicals is inevitable and the proportion of hydrophobic contents
is largely confined. Herein, we report for the first time, the chemical-free
and large-scale fabrication of nonwoven composites having anisotropic
water-penetration features. A layer of chitosan (hydrophobic) fibers
is consolidated with a layer of viscose (hydrophilic) fibers via the
hydroentanglement technique. The high-pressure water jets from hydroentanglement
achieve the vertical movement of fibers, thus generating a gradient
fiber distribution across nonwoven thickness. This gradient fiber
distribution enables fast water-penetration from the hydrophobic side,
even when 90% of the fibers are hydrophobic and the hydrophobic layer
exceeds a record-high thickness of 1.6 mm. Versatility of our method
is further demonstrated by realizing similar water penetration in
nonwovens formed by other types of fibers. Moreover, because no chemical
has been applied throughout the manufacture process, fiber properties
(such as distinct wettability difference, high antibacterial rate,
and good cell viability) can be well inherited by the nonwoven, which
ensures the water-penetration effect to be permanent. Taken together,
we believe that the green fabrication strategy developed in this study
would make the resultant nonwovens competitive in areas where swift
water transportation/absorption, high body/environmental safety, and
amphiphilic properties are desired.
Nanofibre membranes with small diameter and large specific surface area are widely used in filtration fields due to their small pore size and high porosity. To date, aramid nanofibres (ANFs)...
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