scholarly journals Intermediate Air Filters for General Ventilation Applications: An Experimental Evaluation of Various Filtration Efficiency Expressions

2013 ◽  
Vol 47 (5) ◽  
pp. 488-498 ◽  
Author(s):  
Bingbing Shi ◽  
Lars E. Ekberg ◽  
Sarka Langer
Keyword(s):  
Experimental Evaluation ◽  
Filtration Efficiency ◽  
Air Filters

scholarly journals Antimicrobial Air Filters Using Natural Sea Salt Particles for Deactivating Airborne Bacterial Particles

2019 ◽  
Vol 17 (1) ◽  
pp. 190
Author(s):  
Sang Bin Jeong ◽  
Ki Joon Heo ◽  
Byung Uk Lee
Keyword(s):  
Escherichia Coli ◽  
Environmental Exposure ◽  
Staphylococcus Epidermidis ◽  
Deposition Time ◽  
Filtration Efficiency ◽  
Sea Salt ◽  
Air Filters ◽  
Air Filter ◽  
Aerosol Process ◽  
Microbial Contaminants

We developed an antimicrobial air filter using natural sea salt (NSS) particles. Airborne NSS particles were produced via an aerosol process and were continuously coated onto the surface of an air filter under various deposition times. The filtration efficiency and bactericidal performance of the NSS-coated filter against aerosolized bacterial particles (Staphylococcus epidermidis, Escherichia coli) were evaluated quantitatively. The filtration efficiency of the tested filter ranged from 95% to 99% depending on the deposition time, and the bactericidal performance demonstrated efficiencies of more than 98% against both tested bacterial bioaerosols when the NSS deposition ratio was more than 500 μg/cm2. The experimental results indicated that the NSS-coated filters have the potential to be used as effective antimicrobial air filters for decreasing environmental exposure to microbial contaminants.

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 Photocatalytic Activity and Filtration Performance of Hybrid TiO2-Cellulose Acetate Nanofibers for Air Filter Applications

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1331
Author(s):  
Miyeon Kwon ◽  
Juhea Kim ◽  
Juran Kim
Keyword(s):  
Cellulose Acetate ◽  
Surface Hydrophobicity ◽  
Filtration Efficiency ◽  
Particulate Matters ◽  
Photocatalytic Efficiency ◽  
Electrospinning Technique ◽  
Air Filters ◽  
Air Filter ◽  
No Removal ◽  
Home Appliance

A facile method to prepare hybrid cellulose acetate nanofibers containing TiO2 (TiO2-CA nanofibers) by emulsion electrospinning technique was developed for the denitrification and filtration of particulate matters (PMs). This work found that hybrid TiO2-CA nanofibers mainly contain the anatase form of TiO2, contributing to the photodecomposition of NO gas under UV irradiation. The TiO2-CA nanofibers also showed an excellent filtration efficiency of 99.5% for PM0.5 and a photocatalytic efficiency of 78.6% for NO removal. Furthermore, the results implied that the morphology of the TiO2-CA nanofibers, such as micro-wrinkles and protrusions, increased the surface hydrophobicity up to 140°, with the increased addition of TiO2 nanoparticles. The proposed TiO2-CA nanofibers, as a result, would be promising materials for highly efficient and sustainable air filters for industrial and home appliance systems.

Oil-treated pleated fibrous air filters for motor vehicle engine intake application

2019 ◽  
Vol 234 (2-3) ◽  
pp. 702-713
Author(s):  
Ajay Kumar Maddineni ◽  
Dipayan Das ◽  
Ravi Mohan Damodaran
Keyword(s):  
Pressure Drop ◽  
Motor Vehicle ◽  
Life Time ◽  
Filtration Efficiency ◽  
Air Filters ◽  
Air Filter ◽  
Filtration Performance ◽  
Vehicle Engine ◽  
Air Intake ◽  
The Difference

In this work, oil-treated pleated fibrous air filters were developed, characterized, and evaluated for motorcycle engine intake application. The effect of pleat geometry on the filtration performance was examined. Pleat pitch and pleat height were found to play important roles in determining the filtration efficiency, pressure drop, and dust holding capacity. A pleated fibrous filter prepared with optimum levels of pleat pitch and pleat height showed the best filtration performance. The treatment to the pleated filter by viscous oil yielded remarkably higher dust holding capacity and filtration efficiency, both at cleaned and clogged conditions. A statistical analysis revealed that the weight of oil played a significant role in deciding the filtration performance. The oil-treated pleated filter was installed in a commercial air intake system and its filtration performance was assessed. The filter element displayed a significant delay in evolution of pressure drop during dust loading as compared to the untreated one. However, the difference in filtration efficiency between the oil-treated and untreated filter elements was not found to be too high. Nevertheless, both of them met the standard filtration performance as per the best practices followed by the automotive industry. Overall, the oil treatment to cellulosic filters was found to be highly advantageous for motorcycle application. Practical implications of such air filter system were discussed in terms of service life, fuel consumption, and CO2 emission during filter life time.

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