1, ventilation mode
Ventilation is a simple and effective way to discharge harmful gases outdoors through the flow of air. The only drawback is that the formaldehyde release cycle is long, usually three to fifteen years. It is obviously unrealistic to leave the new house idle for more than three years after renovation. So simple ventilation can't meet the requirements.
2. Formaldehyde scavenger
Professor Zhang of beijing university of chemical technology believes that formaldehyde scavengers "clean" formaldehyde through chemical reactions. The essence of this method is to reduce the toxicity of the target substance or convert it into a non-toxic substance, but its toxicity still exists. In addition, the high concentration scavenger sprayed in the air will produce new pollution.
3. Activated carbon adsorption
Teacher Li, who specializes in activated carbon at Nankai University, told reporters that the initial use of activated carbon did have an effect. According to relevant data, in the standard state, a formaldehyde molecule collides with other molecules 109 times per second. If the diameter of the collision molecule matches the pore of activated carbon, it will be adsorbed. However, at present, the adsorption capacity of activated carbon is limited because of its large pores.
4. Soak in water, vinegar and black tea to remove formaldehyde.
It is a fact that formaldehyde is soluble in water, water, alcohol and ether. However, the contact area between water and air in a basin is only the size of a basin, and the specific surface area of pores in 1 g activated carbon can reach the size of a football field. Therefore, it is obviously unrealistic to use water, black tea and vinegar to adsorb formaldehyde.
What's more, when the relative humidity in the air increases 10%, the indoor formaldehyde emission will increase by about 5%. Therefore, using water, vinegar and black tea to soak in water to absorb formaldehyde will make your home formaldehyde content higher.
5, photocatalyst to remove formaldehyde
Under the irradiation of light, photocatalyst will produce a photocatalytic reaction similar to photosynthesis, so it has strong functions of sterilization, deodorization, mildew prevention, self-cleaning and air purification.
In fact, photocatalyst needs ultraviolet light to stimulate, and it is impossible to have ultraviolet light all the time in the room, especially in some places where formaldehyde is released most seriously, such as drawers and cabinets, and it is even more invisible. This limits the role of photocatalyst.
6. Fruits such as oranges and pineapples adsorb formaldehyde.
CCTV Financial Channel made an experiment in the program: in the same sealed warehouse, the formaldehyde content of the experimental warehouse with grapefruit peel is ten times that of the blank warehouse. Because after putting grapefruit peel, the humidity of the experimental warehouse increased, and the amount of formaldehyde released increased greatly. Pomelo peel and pineapple can not only remove formaldehyde, but also increase indoor formaldehyde content.
7. Air freshener
The air freshener only masks the smell of harmful gas with smell, and has no removal effect at all. Moreover, the air freshener itself is also a chemical substance, which will cause some harm to health.
8. Plants absorb formaldehyde
Plants can inhale some harmful substances through photosynthesis, but the effect of this method is extremely limited.
The national standard requires that the formaldehyde emission value is less than 0.08 mg/m3, and the formaldehyde in most newly decorated houses is not less than 0.2 mg/m3, while the formaldehyde absorbed by the high formaldehyde absorption efficiency is only 20 micrograms per hour. For a room of 100 square meters, the height of the room is 3 meters, and the formaldehyde value is 0.2 mg/m3. At the same time, it takes 1800 pots of radish to reduce the formaldehyde to 0.08 mg, which is still carried out under the condition of sufficient sunlight, and it is necessary to ensure that formaldehyde is not released during absorption. In fact, formaldehyde has been continuously released from the renovated furniture. Therefore, plants can only play an auxiliary role in controlling harmful substances such as formaldehyde and benzene.
Obviously, it is unrealistic to remove formaldehyde only in one or two ways in a short time. We still need various effective methods to better purify indoor air.
I hope I can help you!