Microfiber-nanofiber composite filter for high-efficiency and low pressure drop under nano-aerosol loading

Leung, Wallace Woon‐Fong; Hau, Curie Wing-Yi; Choy, Hung-Faat

doi:10.1016/j.seppur.2018.05.033

Cited by 38 publications

(22 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…c. What are the pressure drop in depth and cake filtration, respectively? d. What is rate of change of pressure drop with additional mass deposit during cake buildup in surface filtration [20]? Table 1 summarizes the essential results for the four filters -SU, MU, SC and MC, that address the above questions.…”

Section: Loading Capacity and Pressure Dropmentioning

confidence: 99%

Enhanced nano-aerosol loading performance of multilayer PVDF nanofiber electret filters

Sun

Leung

2020

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

Aerosol loading behavior of PVDF nanofiber electret filters using neutrally charged nano-and submicron aerosols was investigated experimentally for the first time. The loading behavior include variations of filtration efficiency and pressure drop and distribution of deposited aerosols in the filters all having the same fiber basis weight (3.060 gsm). Through the filtration efficiency variations of uncharged/charged, single-/multi-layer filters with aerosol loading, it was observed that mechanical PVDF filters had continuously increasing filtration efficiency, while PVDF electret filters had initially decreasing and subsequently increasing filtration efficiency until reaching 100% due to diminishing electrostatic effect and enhancing mechanical effect.By combining the pressure drop evolution of different filters during aerosol loading and detailed SEM images of the loaded filters, we have demonstrated that multilayer PVDF filters, especially the electret ones, could significantly slow down the pace of filter clogging (skin effect) and increase significantly the aerosol holding capacity during depth filtration. Generally, the multilayer nanofiber filters received the most aerosol deposit during depth filtration, whereas the single-layer nanofiber filters with the same basis weight of fibers received the most deposit during cake filtration. The multilayer nanofiber filters had approximately 70% aerosol deposit in the filter during depth filtration fully utilizing the full filter thickness, especially for the electret filters that had charged fibers, and only 30% deposit in the cake. On the contrary, the single-layer uncharged/charged nanofiber filters were exactly the reverse due to persistency of the skin effect with only 30% deposit in the filter mostly located in the upstream layer, yet 70% deposit in the cake. During depth filtration, the pressure drop per added mass deposit for the multilayer electret filter was very low at 11 Pa gsm −1 , which was at least twice below any other nanofiber filters. This was all attributed to the uniform capture of aerosols by electrostatic effect across the entire filter depth from the upstream to downstream layers of the multilayer electret filter. The above conclusion was confirmed by the detailed SEM images taken across the different filter layers for the multilayer filter configuration. The 4-layer electret nanofiber filter with a 3.060-gsm basis weight has 4 times more aerosol holding capacity than the single uncharged/charged nanofiber filter with the same fiber basis weight in depth filtration. Based on the standpoint of highest efficiency and capacity with maximum pressure drop 800 Pa imposed on the filtration operation, the 4-layer nanofiber electret was the best among all 4 filters. It had 52% more aerosol holding capacity than the single layer uncharged nanofiber filter and 38% more capacity than the charged single-layer and the uncharged multilayer nanofiber filters. The multilayer PVDF electret filters have excellent filtration performance for long-term aerosol filt...

show abstract

Section: Loading Capacity and Pressure Dropmentioning

confidence: 99%

Enhanced nano-aerosol loading performance of multilayer PVDF nanofiber electret filters

Sun

Leung

2020

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…width was 400~800 nm (normal 678 nm) and a normal subatomic load of 150,000[7][8][9]. In light of the distinction in atomic weight, it was obviously seen that the normal and reaches widths between the PAN:TiO 2 and PAN-Co-MA:TiO 2 nanofiber films are positively unique, as shown inFig.…”

mentioning

confidence: 93%

A Review on Electro-spun Nanoﬁbers for Air Pollution Control

Kanu¹,

Kale²

2020

IJAEFEA

View full text Add to dashboard Cite

These days air pollution has emerge as greater severe and commenced to have a dramatic impact at the fitness of people in many big towns. Usually, out of doors personal protection, together with commercial masks cannot successfully save you the inhalation of much pollution. Specific remember (PM) pollutants are specially a critical risk to human fitness. Here we introduce a brand-new green air filtration materials and methodologies that can be used for outside in addition to in Indoor air filtration. Sub-microfibers and nanofibers membranes have an excessive surface to extent ratio which makes them suitable for diverse programs such as environmental remediation and filtration, strength production and garage, digital optical sensors, tissue engineering and drug shipping. The fast file affords an outline of cutting-edge situation of nanofibers produced using electrospinning approach and the one-of-akind polymers used for the manufacturing of nanofibers and the improvement procedures. Index terms-polyacrylonitrile (PAN):TiO 2 , polyacrylonitrile-Co-polyacrylate

show abstract

“…Non-woven microfibers with smaller diameter leads to not only greater filtration efficiency, but also larger pressure drop. For example, nanofiber-based air filters with a diameter smaller than 500 nm have highfiltration efficiency and low air permeability [8]. Therefore, the development of a high-performance nanofiber air filter membrane garners enormous interests from both research and applications worldwide, since nanofibers are rapidly becoming a feasible material alternative.…”

Section: Introductionmentioning

confidence: 99%

Transparent PAN:TiO2 and PAN-co-PMA:TiO2 Nanofiber Composite Membranes with High Efficiency in Particulate Matter Pollutants Filtration

et al. 2020

View full text Add to dashboard Cite

Particulate matter is one of the main pollutants, causing hazy days, and it has been serious concern for public health worldwide, particularly in China recently. Quality of outdoor atmosphere with a pollutant emission of PM2.5 is hard to be controlled; but the quality of indoor air could be achieved by using fibrous membrane-based airfiltering devices. Herein, we introduce nanofiber membranes for both indoor and outdoor air protection by electrospun synthesized polyacrylonitrile:TiO 2 and developed polyacrylonitrile-co-polyacrylate:TiO 2 composite nanofiber membranes. In this study, we design both polyacrylonitrile:TiO 2 and polyacrylonitrile-co-polyacrylate:TiO 2 nanofiber membranes with controlling the nanofiber diameter and membrane thickness and enable strong particulate matter adhesion to increase the absorptive performance and by synthesizing the specific microstructure of different layers of nanofiber membranes. Our study shows that the developed polyacrylonitrile-co-polyacrylate: TiO 2 nanofiber membrane achieves highly effective (99.95% removal of PM2.5) under extreme hazy air-quality conditions (PM2.5 mass concentration 1 mg/m 3 ). Moreover, the experimental simulation of the test in 1 cm 3 air storehouse shows that the polyacrylonitrile-co-polyacrylate:TiO 2 nanofiber membrane (1 g/m 2 ) has the excellent PM 2.5 removal efficiency of 99.99% in 30 min.

show abstract

Microfiber-nanofiber composite filter for high-efficiency and low pressure drop under nano-aerosol loading

Cited by 38 publications

References 17 publications

Enhanced nano-aerosol loading performance of multilayer PVDF nanofiber electret filters

Enhanced nano-aerosol loading performance of multilayer PVDF nanofiber electret filters

A Review on Electro-spun Nanoﬁbers for Air Pollution Control

Transparent PAN:TiO2 and PAN-co-PMA:TiO2 Nanofiber Composite Membranes with High Efficiency in Particulate Matter Pollutants Filtration

Contact Info

Product

Resources

About