The principle of the air purifier is to promote air circulation through the ventilation system. The household air purifier will flow the air to be filtered from the air inlet into 3-4 layers of filters, adsorb and decompose harmful substances in the air, and continue to circulate Then reduce the content of harmful substances in the air, and finally achieve the purpose of purifying the air. The main purification objects of air purifiers are PM2.5, dust, animal hair, pollen, second-hand smoke, bacteria, etc.
In view of the previous haze situation, most air purifier filters are only able to filter particulate matter. In other words, the “enemy” to be overcome by air purifiers is actually PM2.5 as we all know it. However, due to the seriousness of indoor air pollution, people pay more and more attention to formaldehyde. Many air purifiers Also played a gimmick of removing formaldehyde.
We know more or less that activated carbon has the effect of adsorbing formaldehyde. Therefore, if the filter in the household air purifier is replaced with activated carbon, it does have the effect of purifying indoor air, but it is only adsorption, not removal.
Effectively acts on activated carbon, but the reverse is also true. Activated carbon has a characteristic, that is, it will be saturated with adsorption. After reaching a certain amount of adsorption, it will reach a saturated state, so there will be no adsorption of other formaldehyde, and it will even form a new source of pollution. .
Secondly, the air purifier can only absorb the free formaldehyde that has been released from the board, and cannot do anything about the formaldehyde enclosed in the board. Moreover, since household air purifiers only work on a limited indoor space, if the formaldehyde in each room does not exceed the standard, several air purifiers are required to work non-stop.
Of course, it is not to say that air purifiers are definitely useless for indoor air pollution. Aiming at air pollution in the home environment, air purifiers are used as an auxiliary purification method and a subsequent purification method.
Post time: Aug-19-2021