Multifunctional polyethylene (PE)/polypropylene (PP) bicomponent fiber filter with anchored nanocrystalline MnO<sub>2</sub> for effective air purification

Dai

Zhou

et al. 2019

Journal of Chemistry

Self Cite

Air filtration materials such as protective masks can protect humans from airborne pathogens; however, most of the existing protective filtration materials are aimed to intercept bacteria. Therefore, in this work, modified polypropylene- (PP-) based melt-blown nonwovens with antibacterial property were prepared for reducing the infection rate during the filtering process. Firstly, an N-halamine precursor, 2,4-diamino-6-diallylamino-1,3,5-triazine (NDAM) monomer, was grafted with PP polymers (PP-g-NDAM) by reactive extrusion method, and the grafting effect was confirmed by nitrogen analysis and FTIR spectra. Then, the obtained PP-g-NDAM was mixed with pristine PP resins in different ratios to prepare the filter materials by melt-blown technology. Finally, the new PP-g-NDAM melt-blown filter materials were finishing treated by the chlorination and electrostatic process, which showed a high filtration efficiency with low pressure drop and a potent antibacterial effect against Escherichia coli (E. coli). This work provides an innovative method for manufacturing antibacterial filtration nonwovens, which can improve the quality of conventional filtration products.

Section: Preparation Of Melt-blown Nonwovensmentioning

confidence: 99%

Fabrication of Polypropylene-g-(Diallylamino Triazine) Bifunctional Nonwovens with Antibacterial and Air Filtration Activities by Reactive Extrusion and Melt-Blown Technology

Dai

Zhou

et al. 2019

Journal of Chemistry

Self Cite

“…To tackle this problem, the public have to wear mask filters in the open air, even though they are bulky and resistant to air flow; and must use central air conditioning or ventilation system to purify the indoor air . Fibrous filters, which function as the core part of these methods, are of especial importance and have been widely used owing to their advantages of high cost‐efficiency and ease of large‐scale production . However, due to the inherent limit on their micro‐sized diameters (usually >5 µm), traditional fibrous filters, for instance, melt‐blown microfibers and glass microfibers still suffer from fatal structure defect of large pore size when they have low thickness.…”

Section: Introductionmentioning

confidence: 99%

A Fluffy Dual‐Network Structured Nanofiber/Net Filter Enables High‐Efficiency Air Filtration

Zhang

et al. 2019

Adv Funct Materials

194

142

Particulate matter (PM) pollution has posed a huge health and economic burden worldwide. Most existing air filters used to remove PMs are structurally monotonous, cumbersome, and inevitably suffer from the compromise between removal efficiency and air permeability; developing an advanced air filter that can overcome these limitations is of significance but highly challenging. Herein, a novel strategy to create ultrathin, high-performance air filters based on fluffy dual-network structured polyacrylonitrile nanofiber/ nets, via a humidity-induced electrospinning/netting technique, is reported. By tailoring the ejection and phase separation of the charged liquids, this approach causes 2D ultrafine (≈20 nm) nanonets tightly bonded with fluffy pseudo-3D nanofiber scaffolds to form dual-network structures, with controllable pore size and stacking density on a large scale. The resultant nanofiber/ net filters possess the integrated features of small pore size (<300 nm), high porosity (93.9%), low packing density, combined with desirable surface chemistry (4.3-D dipole moment), resulting in high-efficiency PM 0.3 removal (>99.99%), low air resistance (only <0.11% of atmosphere pressure), and promising long-term PM 2.5 purification. The synthesis of such materials may provide new insights into the design and development of high-performance filtration and separation materials for various applications.

“…The Raman spectrum in Figure b exhibited two peaks centered at 1344 cm −1 and 1599 cm −1 , respectively, confirming the existence of rGO in ZnSnS 3 @rGO . Moreover, as shown in Figure c, the N 2 adsorption‐desorption isotherm of ZnSnS 3 @rGO exhibited an IV type profile according to the IUPAC classification . The specific surface area of ZnSnS 3 @rGO was 110.79 m 2 g −1 , while its average pore diameter was 51.3 Å.…”

Section: Resultsmentioning

confidence: 60%

Advanced ZnSnS₃@rGO Anode Material for Superior Sodium‐Ion and Lithium‐Ion Storage with Ultralong Cycle Life

et al. 2018

A novel and facile approach has been utilized to synthesize zinc tin sulfide@reduced graphene oxide (ZnSnS 3 @rGO) through aqueous reaction of Na 2 SnO 3 and Zn(CH 3 COO) 2 , combined with a subsequent solvothermal reaction and an annealing process. The as-prepared ZnSnS 3 @rGO nanocomposite exhibited an excellent sodium-and lithium-ion-storage performance with large specific capacity, high rate capability, and ultralong cycle life. When used in Na-ion cells, the ZnSnS 3 @rGO nanocomposite delivered a capacity of 472.2 mAh g À 1 at 100 mA g À 1 and retained a specific capacity of 401.2 mAh g À 1 after 200 cycles. In Li-ion cells, the ZnSnS 3 @rGO nanocomposite delivered a capacity of 959.2 mAh g À 1 at a current density of 100 mA g À 1 and maintained a specific capacity of 551.3 mAh g À 1 at a high current density of 1 A g À 1 upon 500 cycles. The electrochemical performance results reveal that the integration of uniformly dispersed metal elements and an interconnected carbon matrix could help release the stress of volumetric excursion and provide fast electron/ion transport, leading to a remarkable electrochemical performance.