Made significant progress in self-powered air filtration equipment research

Air pollution is a major hazard faced by humanity in recent years. According to the analysis of the 2017 global burden of disease study, particle pollution (PM) in the air has become one of the four risk factors lead to our death and reduced life expectancy. The aerodynamic diameter classification, PM can be divided contamination of PM10 (particle diameter <10 μm), PM2.5 (particle diameter <2.5 μm) and nano-level particle contaminants (NP, aerodynamic diameter <1 μm) . Among them, the current common market PM2.5 masks protective equipment has been done over the PM2.5 level protection against contaminants. However, it should be noted that, for the NP has a smaller kinetic diameter, and they have greater difficulty protection. At the same time, due to the small particle size of the NP, easier to form an aerosol in the air, and suspended in the long-term air. In addition, NP can easily enter and damage the human respiratory tract, skin, brain, lungs and immune system, and even cause DNA damage. Therefore, of great significance for the study of NP protective equipment.

Figure 1 a schematic view of an apparatus for producing filter

Based on this, Sichuan University Taoguo Hong , He Ling group were designed and preparing a NP can efficiently remove contamination and pollution of a conventional PM smaller particle size self-powered air filtration devices. By supplying the low voltage to the device within the body of the safe range, to achieve efficient adsorption of particle contamination.

FIG. 2. ILP apparatus and materials adsorbing contaminants efficiency PM

The functional group incorporates materials with good electrochemical characteristics – ionic liquid 1 methyl-3-butyl imidazolium acetate ([C4mim] [OAc]) and a polymer having a good plasticity, the preparation may be randomly distributed on the porous conductive polymer foam composites skeleton (ILP). This ingenious design not only to achieve a sufficient contact with the contaminant material, but also reduce the pressure drop across the filter device. Most by adding a secure final voltage of 3 V, to achieve efficient removal of PM2.5, PM10 and the NP, efficiency of 99.59%, 99.75% and 93.77%.

Figure 3. The self-powered portable respirator and filter effects
In order to achieve practical application of the material, researchers tried to filtering material mounted installation ILP to the mask, or a lithium coin cell binding solar panels, can be prepared in a new self-powered filter masks. In the case where no external power supply, the portable head mounted high efficiency air filtration devices prepared. According to the research, the device has a good long-term stability, compared with the commercial masks, have better particle removal efficiency.
The results of recently published in Nature Communications , the first author is graduate Zhang Guohao , corresponding author Professor Tao Guohong , Professor He Lingfu .
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