scholarly journals Synthesis of hybrid hydrophobic composite air filtration membranes for antibacterial activity and chemical detoxification with high particulate filtration efficiency (PFE)

2015 ◽  
Vol 260 ◽  
pp. 801-808 ◽  
Author(s):  
Anbharasi Vanangamudi ◽  
Sakinah Hamzah ◽  
Gurdev Singh
Keyword(s):  
Antibacterial Activity ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Filtration Membranes ◽  
Particulate Filtration

scholarly journals High-performance electret and antibacterial meltblown nonwovens doped with nanoparticles of boehmite and ZnO for air filtration

2021 ◽  
Author(s):  
Mingchao Han ◽  
Hongwei He ◽  
Weikang Kong ◽  
Kun Dong ◽  
Bangying Wang ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
High Performance ◽  
Effective Means ◽  
Antibacterial Properties ◽  
Core Layer ◽  
Filtration Efficiency ◽  
Raw Material ◽  
Air Filtration ◽  
Air Filters ◽  
Corona Charging

The current pandemic caused by Covid-19 triggered intensively the development of high-performance air filters. Polypropylene (PP) is widely used as the raw material of meltblown nonwovens that is the core layer in air filters, such as, masks. In this study, an electret PP meltblown nonwoven with antibacterial activity was developed, and nano boehmite (AlOOH) and nano-ZnO employed as electret and antibacterial agent, respectively. 0.5-2.0 wt% of AlOOH and 1.0 wt% of ZnO were doped into PP matrix using a twin-screw extruder and the resulting masterbatches applied as raw materials to afford nonwovens via a meltblown process. The as-prepared nonwovens were characterized by means of SEM, IR and DSC/TG, and after corona charging, the filtration efficiency, charge decay and antibacterial properties were evaluated. More than 1.0 wt% dosage of AlOOH endowed the nonwoven with high filtration efficiency and 1.0 wt% of ZnO brought about antibacterial activity. Corona charging was an effective means to make the nonwovens electret charged and the charges were quicker to decay in air than in a sealed bag. The as-prepared meltblown nonwoven would be a remarkably promising filter in air filtration.

scholarly journals Composites Based on Nanoparticle and Pan Electrospun Nanofiber Membranes for Air Filtration and Bacterial Removal

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1740 ◽  
Author(s):  
Ana Cláudia Canalli Bortolassi ◽  
Vádila Giovana Guerra ◽  
Mônica Lopes Aguiar ◽  
Laurence Soussan ◽  
David Cornu ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Quality Factor ◽  
Filtration Efficiency ◽  
High Specific Surface Area ◽  
Air Filtration ◽  
Scanning Mobility Particle Sizer ◽  
Good Ability ◽  
Bacterial Removal ◽  
Nanofiber Membranes ◽  
Particle Sizer

Often, solid matter is separated from particle-laden flow streams using electrospun filters due to their high specific surface area, good ability to capture aerial particulate matter, and low material costs. Moreover, electrospinning allows incorporating nanoparticles to improve the filter’s air filtration efficiency and bacterial removal. Therefore, a new, improved polyacrylonitrile (PAN) nanofibers membrane that could be used to remove air pollutants and also with antibacterial activity was developed. We engineered three different filters that are characterized by the different particles embedded in the PAN nanofibers: titanium dioxide (TiO2), zinc oxide (ZnO), and silver (Ag). Then, their filtration performance was assessed by quantifying the filtration of sodium chloride (NaCl) aerosol particles of 9 to 300 nm in diameter using a scanning mobility particle sizer. The TiO2_F filter displayed the smallest fiber diameter and the highest filtration efficiency (≈100%). Conversely, the Ag_F filter showed the highest quality factor (≈0.06 Pa−1) because of the lower air pressure drop. The resulting Ag_F nanofibers displayed a very good antibacterial activity using an Escherichia coli suspension (108 CFU/mL). Moreover, the quality factor of these membranes was higher than that of the commercially available nanofiber membrane for air filtration.

scholarly journals Development of Needle-Punched Nonwoven Fabrics from Reclaimed Fibers for Air Filtration Applications

2014 ◽  
Vol 9 (1) ◽  
pp. 155892501400900 ◽  
Author(s):  
S. Sakthivel ◽  
Anban J.J. Ezhil ◽  
T. Ramachandran
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Air Permeability ◽  
Filtration Efficiency ◽  
Raw Material ◽  
Fine Tuning ◽  
Physical Parameters ◽  
Air Filtration ◽  
Nonwoven Fabrics

This paper reports an investigative study on the fabrication and measurement of the air permeability, mechanical properties, pore size distribution, and filtration efficiency of different nonwoven fabrics produced from reclaimed fibers by analytically changing the machine variables to manipulate the physical parameters of the nonwoven fabrics. Reclaimed fiber of cotton (60%) and polyester (40%) blend was used, so that the prospect of value addition to an inexpensive source of raw material could be explored. The changes in air permeability were interpreted in terms of fabric density profile and pore size distribution. The filtration parameters of filtration efficiency, dust holding capacity, and pressure drop were also calculated. Additionally, the effects of calendering on pore size and filtration properties were evaluated to discover the opportunity of fine-tuning and the performance of the filters. The outcome in this study reflected an overall development in all filtration characteristics due to the calendering operation.

scholarly journals Preparation of electrospun nanofiber membrane for air filtration and process optimization based on BP neural network

2021 ◽  
Author(s):  
Le Kang ◽  
Yuankun Liu ◽  
Liping Wang ◽  
Xiaoping Gao
Keyword(s):  
Neural Network ◽  
Quality Factor ◽  
Flow Rate ◽  
Bp Neural Network ◽  
Polyvinylidene Fluoride ◽  
Orthogonal Experiment ◽  
Solution Concentration ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Filtration Resistance

Abstract The filtration layer in a medical protective mask can effectively prevent aerosol particles that might carry viruses from air. A nanofiber/microfiber composite membrane (NMCM) was successfully fabricated by electrospinning polyvinylidene fluoride (PVDF) nanofibers collected on the electrified and melt-blown polypropylene (PP) nonwovens, aiming to improve the filtration efficiency and reduce the resistance of respiration of mask. A four-factor and three-level orthogonal experiment was designed to study the effect of electrospinning parameters such as spinning solution concentration, voltage, tip-collect distance (TCD), and flow rate of solution on the filtration efficiency, resistance of respiration as well as quality factor of NMC developed to predict the resistance of respiration. Experimental results demonstrated that the filtration efficiency of NMCM≥95% in comparison to that of electrified and melt-blown PP nonwovens 79.38%, which increases by 19.68%. Additionally, the average resistance of respiration is 94.78 Pa, which meets the protection requirements. Multivariate analysis of variance indicated that the resistance of respiration of the NMCM has significantly dependent on the concentration, voltage, TCD, and flow rate of the spinning solution and the quality factor of the NMCM has dependent on the resistance of respiration. The air permeability ranges from 166.23 to 314.35mm/s, which is inversely proportional to the filtration resistance. As far as the filtration resistance is concerned, the optimal spinning parameters were obtained as follows. The concentration of spinning solution is 15%, the voltage is 27 kV, the TCD is 22 cm, and the flow rate is 2.5 mL/h. The relative error of the BP neural network varies from 0.49505% to 1.49217%, i.e. the error value varies from 0.17 to1.33 Pa. The predicted resistance of respiration corresponding to the optimal process is 68.1374 Pa.

scholarly journals Preparation of Ag Doped Keratin/PA6 Nanofiber Membrane with Enhanced Air Filtration and Antimicrobial Properties

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1511 ◽  
Author(s):  
Baolei Shen ◽  
Dongyu Zhang ◽  
Yujuan Wei ◽  
Zihua Zhao ◽  
Xiaofei Ma ◽  
...  
Keyword(s):  
Composite Membrane ◽  
High Efficiency ◽  
Large Diameter ◽  
Composite Membranes ◽  
Dark Field ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Nanofiber Membrane ◽  
Scanning Calorimetry ◽  
Antibacterial Performance

Coarse wool is a kind of goat wool that is difficult to further process in the textile industry due to its large diameter, dispersion, better strength, and less bending. Therefore, coarse wool is often discarded as waste or made into low-cost products. In this work, keratin was extracted from coarse wool by a high-efficiency method, and then, an Ag-doped keratin/PA6 composite nanofiber membrane with enhanced filtration and antibacterial performance was prepared using HCOOH as solvent and reductant. HAADF-STEM (high-angle annular dark field-scanning transmission electron microscopy) shows that AgNPs are uniformly distributed in keratin/PA6 (30/70) nanofibers. TGA (Thermogravimetric Analysis) and DSC (Differential Scanning Calorimetry) were employed to investigate the thermal stability of composite membranes with different keratin and AgNP contents. The present keratin as a dopant with polyamide-6 (PA6) was found not only to improve air filtration efficiency but also to enhance water–vapour transmission (WVT). The addition of the Ag nanoparticles (AgNPs) gave a strong antibacterial activity to the composite membrane against Staphylococcus aureus (99.62%) and Escherichia coli (99.10%). Bacterial filtration efficiency (BFE) of the composite membrane against S. aureus and E. coli were up to 96.8% and 95.6%, respectively. All of the results suggested a great potential for coarse wool extraction and application in the air filtration field.

scholarly journals Novel manufacturing of simple masks in response to international shortages: Bacterial and particulate filtration efficiency testing

2020 ◽  
Vol 48 (12) ◽  
pp. 1543-1545 ◽  
Author(s):  
Jennifer Bayersdorfer ◽  
Sue Giboney ◽  
Rosemary Martin ◽  
Andria Moore ◽  
Rebecca Bartles
Keyword(s):  
Filtration Efficiency ◽  
Particulate Filtration

scholarly journals Design of Polypropylene Electret Melt Blown Nonwovens with Superior Filtration Efficiency Stability through Thermally Stimulated Charging

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2341
Author(s):  
Haifeng Zhang ◽  
Nuo Liu ◽  
Qianru Zeng ◽  
Jinxin Liu ◽  
Xing Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Particulate Matter ◽  
Filtration Efficiency ◽  
Personal Protection ◽  
Air Filtration ◽  
Air Resistance ◽  
Filtration Material ◽  
Charge Stability ◽  
Novel Strategy ◽  
Production Probability

Electret filters are widely used in particulate matter filtration due to their filtration efficiency that can be greatly improved by electrostatic forces without sacrificing the air resistance. However, the attenuation of the filtration efficiency remains a challenge. In this study, we report a novel strategy for producing an electret melt blown filter with superior filtration efficiency stability through a thermally stimulated charging method. The proposed approach optimizes the crystal structure and therefore results in the increased production probability of the charge traps. In addition, the re-trapping phenomenon caused by the thermal stimulation during the charging process can greatly increase the proportion of deep charge to shallow charge and improve the charge stability. A superior electret melt blown filtration material with a high filtration efficiency of 99.65%, low pressure drop of 120 Pa, and satisfactory filtration efficiency stability was produced after three cyclic charging times. The excellent filtration performance indicated that the developed material is a good air filtration candidate component for personal protection applications.

Characterization of glass fiber felt and its performance as an air filtration media

2020 ◽  
pp. 152808372096141
Author(s):  
Chi Zou ◽  
Yunlong Shi ◽  
Xiaoming Qian
Keyword(s):  
Pressure Drop ◽  
Glass Fiber ◽  
Separation Efficiency ◽  
Theoretical Calculations ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Slow Increase ◽  
Filter Materials ◽  
Fine Fiber

The glass fiber felt made through flame blowing process was characterized on morphology and its filtration performance. Fiber diameter has been measured through SEM and BET methods. Theoretical calculations on pressure drop and filtration efficiency were developed and compared with the experimental measurement. The discrepancy between the calculated results and measurement on filtration efficiency is derived from the presence of fine fiber (<0.5µm) in the glass fiber felt, which contributes to the actual high filtration efficiency in measurement. The multiple micro-layered structure in glass fiber felt, which improves the dust holding capacity and enables glass fiber felt as a depth filter. Glass fiber felt showed a longer duration of the slow increase region for pressure drop build-up comparing to other filter materials with lower averaged pressure drop through its filtration service life. Furthermore, quality factor calculation has been developed for prediction on the energy cost performance of the filters based on the pressure drop, separation efficiency and dust holding capacity.

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