Can the air purifier remove formaldehyde?
Today, indoor air pollution has become the primary problem for people. In particular, the decoration of formaldehyde pollution has caused people to pay enough attention. Therefore, the air purifier has become one of the home appliances considered by many families, but is it really as we imagined that the air purifier can remove formaldehyde? Is the air purifier useful in addition to formaldehyde?
First, let’s take a look at how air purifiers work in addition to formaldehyde.
At present, the air purifiers on the market mainly remove formaldehyde by two ways, one is filtered filtration, which can adsorb formaldehyde molecules in the air, which is the same as the principle of activated carbon, but this kind of filter should be changed frequently, and it can only passively adsorb free. Formaldehyde in the air. There is also a negative ion air purifier that can generate negative ions and utilize the biological activity of negative ions to neutralize harmful substances in the air. When the air purifier is working, the micro-fan (also called the ventilator) in the machine enters the air to be filtered from the air inlet and flows through the filter screen. The formaldehyde in the air is filtered by the de-formaldehyde filter and the HEPA filter in the filter. Decomposed, so that the formaldehyde content in the circulating air will continue to decrease, and the air purifier with negative ion function can also release the high-energy negative ion micro-fan to send out, forming a negative ion gas stream and formaldehyde in the air for a chemical reaction. Decompose the formaldehyde in the air. Can this prove that the air purifier can effectively remove formaldehyde?
Song Guangsheng, director of the China National Indoor Interior-Environment and Environmental Product Quality Supervision and Inspection Center, said in an interview with the media that most of the air purifiers on the market claimed nearly zero formaldehyde removal. First of all, the presence of formaldehyde is not a one-time, but slowly accumulated through the long-term decoration process, formaldehyde from a variety of carriers is more and more continuous, it is difficult to quickly and effectively remove, which requires a long-term process To volatilize. In addition, the CADR value of the purified air pollutants will be at least 60m3/h, which will be effective. Due to the continuous release of household formaldehyde, the actual effect may not reach 29m3/h. For household air purifiers, the selling point for purifying formaldehyde remains on paper.
So, why are many air purifier manufacturers still confidently promoting their products to remove formaldehyde?
It is understood that the test data of formaldehyde in addition to formaldehyde provided by many manufacturers is obtained in a closed experimental box. The formaldehyde is injected into the box, and then the air purifier is used to start the work, and the data of the experimental results are obtained. It can be seen that the test and test conditions are inconsistent with the actual use environment, and the purification effect is naturally greatly reduced. The key to the efficient removal of formaldehyde by air purifiers is the amount of filter media and activated carbon used. If there is only a general formaldehyde removal filter, it should be considered as a function of removing formaldehyde, but it cannot match the word “efficient”. Of course, even if the Olansi air purifier can effectively decompose and remove formaldehyde molecules, it can not prevent the continuous release of formaldehyde in the room. Therefore, the public should pay attention to the service life of the filter element and replace it in time, otherwise, it will form secondary pollution. Therefore, air purifiers can only play a supporting role in addition to formaldehyde. Now there are some unscrupulous merchants who use formaldehyde to remove formaldehyde. It is just a commercial gimmick. In addition to formaldehyde, it is necessary to ventilate and scientifically control.
In addition to formaldehyde, air purifiers must meet the following conditions:
1. The amount of activated carbon should be sufficient: the weight and thickness of the activated carbon filter have a decisive influence on the removal of formaldehyde. At present, the general household air purifier manufacturers are limited by technology, the limit of the amount of activated carbon is 6.8 kg, and some are only a few dozen grams! However, there are also some manufacturers that use very large amounts of activated carbon, and some even as high as 16.3 kg! More amount of activated carbon is the “substance” guarantee that the air purifier can effectively remove chemical harmful gases such as formaldehyde, benzene, xylene, and TVOC.
2, activated carbon modification technology is better: not all activated carbon can remove formaldehyde, military-grade activated carbon is mainly through the modification of its surface to remove chemical harmful gases. Only by mastering the activated carbon modification technology and transplanting the industrial air cleaning technology and the activated carbon modification technology of the military gas mask into the household air purifier can the super purification and adsorption effect on chemical and harmful gases such as formaldehyde and benzene be realized!
3, the structural design should be unique: in addition to formaldehyde has special requirements for the structural design of the air purifier. The adsorption of formaldehyde by activated carbon takes a certain period of time. The adsorption rate of formaldehyde on activated carbon is generally about 40% in one hour, while the ordinary purifier mostly uses the side inlet side to the wind or the lower inlet to the wind. The structural design can greatly reduce the wind resistance of the filter and increase the air volume, but at the same time, the residence time of the polluted air in the filter is too short and the residence distance is too short. This has little effect on removing particulate pollutants such as PM2.5. Because the particle pollutants are less difficult to filter, the effect of the air purifier in addition to formaldehyde is not very good. In order to achieve a good formaldehyde removal effect, an air purifier must use a completely different structure from a normal air purifier.
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