High-performance inertial impaction filters for particulate matter removal

Abstract

Airborne particulate matter (PM) is causing more and more serious air pollution and threatening the public health. However, existing air filter technologies with the easy-to-block manner can rarely meet the requirements of high-performance PM filters. Here we propose a conceptually new type of inertial impaction filters for rapidly high-efficiency PM removal. Under the airflow velocity of 8.0 m/s, the real inertial impaction filters show high PM removal efficiencies of up to 97.77 ± 1.53% and 99.47 ± 0.45% for PM2.5 and PM10, respectively. Compared with the traditional air filters reported previously, the inertia impaction filters exhibit extremely low pressure drop of 5–10 Pa and high quality factor (QF) values of 0.380 Pa−1 and 0.524 Pa−1 for PM2.5 and PM10, respectively. These greatly improved QF values are achieved through a series of inertial separation processes. The feature dimension of filtration channel is dozens of times larger than PM average size, which greatly decreases airflow resistance. Particularly, this inertial structure can be made of various types of materials, which shows great potential for low-cost fabrication of large-area devices. As a stand-alone device or incorporated with the existing PM air filter, this inertial impaction filter will bring great benefits to the public health.

Metal-organic frameworks with photocatalytic bactericidal activity for integrated air cleaning

“…As shown in Fig. 4d, MOFilter achieved 96.8% removal of PM 2.5 particles and 97.7% removal of PM 10 particles with a low pressure drop (64 Pa) at flow rate of 0.7 m s −1 , which was as good as the performance we presented detailly in our previous work 10,34 . Here we focused more on the air sterilization performance of MOFilter.…”

“…Due to the physical barrier and adhesion effect, these filters show good capture efficiency for PM 6,9 , meeting the high efficiency particulate air standard. But significant disadvantages exist for these commonly used fibrous filters, including high air resistance and limited inhibition ability against harmful microorganisms 8,10–12 . In particular, they are only capable of partial retention of pathogens like bacteria, fungi, and virus onto the filter surface, instead of completely cleaning them out 11,12 .…”

Study on Performance of Mesoscopic Impactor Filters for Aerosol Removal

“…When the aerosol particles enter the inertial impactor with airflow, the direction of the airflow suddenly changes when passing through the elbow. e aerosol particles with a large mass tend to follow the original trajectories due to the inertia effects [20] so that they cannot follow the airflow and collide with the wall, which is used for capture. e aerosol with small particles has good followability to the airflow and is easy to flow out with the airflow without being collected.…”

Patterned nanofiber air filters with high optical transparency, robust mechanical strength, and effective PM2.5 capture capability

“…Over the last decade, air quality has been deteriorating in many areas of the world. [1][2][3][4] Worldwide, ambient levels of PM 2.5 (atmospheric particulate matter with aerodynamic diameters less than or equal to 2.5 mm) continue to exceed the air quality guideline (#10 mg m À3 ) established by the World Health Organization (WHO); moreover, 80% of the world's population lives in polluted environments, where the levels of PM 2.5 exceed the standard value. The most recent report analysis indicated that air pollution from worldwide exposure to PM 2.5 accounts for $6% of global all-cause deaths.…”