The function and use effect of household activated carbon

In the home of Mr. Wang Zhaolong, an expert in activated carbon, 10 kilograms of activated carbon cost two or three hundred dollars. In the market, small-package “home” activated carbon is sold for dozens or even hundreds of yuan. People can't help but ask questions. Where can I buy practical, effective and cheap activated carbon? A room contaminated with harmful gases such as formaldehyde, how much can the amount of activated carbon be used to purify the air? Let the activated carbon spread the pollution source such as cabinets to solve the pollution. Question? Relevant experts have explained.

·Experience to purify the air: The floor of the room is full of activated carbon to adjust the humidity: help the floor to isolate moisture:

As an environmental expert, the home of Mr. Wang Zhaolong, China Indoor Environmental Monitoring Center, embodies the theme of “environmental protection”. During the renovation of the bedroom, Wang Zhaolong considered the air pollution that may be caused by furniture and decoration. Especially before laying the floor, the floor was covered with a layer of activated carbon. Because for the purification of air, the partial use of one or two packs of activated carbon is of no use, the activated carbon must reach a certain amount.

"The activated carbon itself has the function of purifying water and air. The adsorption effect of formaldehyde and benzene on the two main pollution sources of air pollution is very good. And after a period of decoration, the main role of activated carbon will be changed to adjust the air humidity." Song Guangsheng introduced that activated carbon can absorb the moisture in the air and thus regulate the humidity of the air. In addition, if the home is paved with solid wood flooring, laying a layer of activated carbon underneath will extend the life of the solid wood flooring. Activated carbon can ensure the constant humidity of the floor by absorbing moisture from the air. When the climate is relatively dry, the moisture in the activated carbon will gradually be released.

· Scientific blank "How much air purification of activated carbon can be used to purify room air":

For the problem of how much activated carbon is used in a square meter room, Mr. Wang Zhaolong said that there is no such data yet. However, based on his experience, he laid 10 kg of activated carbon under the floor of his bedroom of more than 20 square meters.

Guo Fu also said that it is not clear that activated carbon adsorbs impurities in one cubic meter of air, but he is positive about the ability of activated carbon to purify air. Coincidentally, in order to eliminate the "odor" brought by office furniture such as large bookcases and writing desks, Guo Fu's office also used a lot of activated carbon. “A bag (activated carbon) will be placed in almost two or three drawers, and a lot of books will be placed on the shelves.”

Tips for using activated carbon:

1. The adsorption capacity of activated carbon has a lot to do with its shape. The smaller the particles, the larger the surface area and the better the adsorption effect. On the contrary, the activated carbon adsorption effect of Chengyu is the worst. Therefore, if bulk activated carbon is used, it is best to spread it into a face.

2. The activated carbon placed in the purifier has been used for a long time, and it can be used after being exposed to the sun.

3. In addition to bookcases and drawers, it is more convenient to place the activated carbon in a small bamboo basket, in a heating hood or in a flower cabinet.

4. Households using high-grade flooring are suitable for activated carbon, which can extend the service life of the floor.

· Decrypt the activated carbon to physically adsorb impurities in the air:

Activated carbon is a kind of microcrystalline carbon material made of carbon-containing material with black appearance, developed internal pore structure, large specific surface area and strong adsorption capacity. Because the activated carbon contains a large number of micropores that are invisible to the naked eye - a granular particle size of activated carbon particles, the internal surface area of ​​the micropores is equivalent to the size of a large living room wall surface, and a large number of surface molecules of activated carbon can generate strong gravitational force, adsorption medium Impurities and heavier molecules, such as chlorine, benzene, ammonia, etc., so placing a certain amount of activated carbon at home can effectively "capture" all kinds of harmful toxic gases and impurities.

However, just like the checkerboard of marble checkers, the adsorption of harmful gases by activated carbon is equivalent to embedding a piece of chess into the space of the board. The adsorption capacity of activated carbon will gradually weaken as the micropores are filled, and finally reach adsorption saturation. Therefore, if activated carbon is used to purify the air in a place where there is a constant source of pollution, the activated carbon should be replaced once in a while.

· Market traps, utility products, vacancies, profiteering products are endless:

“It is very difficult for ordinary people to buy practical activated carbon in the market.” Wang Zhaolong said when evaluating the market status of activated carbon. The activated carbon used in his home was bought from the factory, and 10 kilograms of activated carbon cost two or three hundred dollars. In the market, small-package "home" activated carbon is sold to dozens or even hundreds of dollars. The reporter found several brands of activated carbon in the market, and the price of 50g packaging is concentrated between 30 yuan and 80 yuan.

On the other hand, activated carbon, which is in the name of environmental protection, has become an ornament, and it has been listed on various names. The reader, Ms. Liu, has spent more than 10,000 yuan to buy a beautiful carbon carving. "On the one hand, it is an environmentally friendly product that can purify the air, and on the other hand, it is also an ornament." It is this kind of consumer psychology that leads speculators to take advantage of it. The reporter saw in the market that the carbon carvings that have already begun to become popular are expensive, and the cheapest ones are several hundred yuan. The owner of the charcoal carving will definitely introduce the environmental performance of the carbon carving. Another stall seller selling bamboo charcoal told reporters that bamboo charcoal can also absorb electromagnetic radiation. This statement was denied by Wang Zhaolong.

To use household activated carbon to purify the home air to achieve the desired results, the main points to note:

1. Van der Waals force determines the adsorption distance of activated carbon, which mainly acts on harmful substances in the air near the activated carbon. Therefore, the closer the activated carbon is to the harmful substances, the better, it is best to be the source of indoor pollution, such as wardrobes, cabinets, shoe cabinets, etc., and when using, be sure to close the wardrobe door so that harmful substances will not be released into the indoor air, activated carbon The adsorption of harmful substances is also more sufficient. For indoor large-area use, it is necessary to maintain good ventilation, increase the flow of air, and bring harmful substances to the vicinity of activated carbon through air flow, so as to facilitate the adsorption of harmful substances by activated carbon.

2. It belongs to the physical adsorption regulation and treatment method, which is like the principle of traditional Chinese medicine, and the treatment effect is relatively slow. Therefore, activated carbon has a good effect on light and moderate pollution. For heavy pollution (people can directly feel such as: the pungent taste of formaldehyde, glare), it should be used in conjunction with the plant decontamination method. Indoor pollution is complex and diverse. When using in a large space, in addition to the principle of being closer to the source of pollution, it is also important to pay attention to places that people often stay for a long time, such as on desks, under sofas, and coffee tables. It can be placed on the computer desk, bedside table, under the bed, etc.

3. The service life of activated carbon is long, which matches the slow release process of harmful substances in the room. It is not terrible for the decoration of new houses. It is not terrible, because the indoor air that has been polluted is not the focus of pollution control. The long-term stability of the indoor environment is the key point. Solve the strong decoration smell in the room, it only takes a few days and a lot of ventilation to discharge most of it to the outside (can be assisted by electric fans), or the effect of using black tea is also very good, and then use activated carbon to control the source of pollution to ensure indoor Not contaminated by harmful substances that are continuously released.

4. Activated carbon adsorption The pollutants in the air are air as the medium. The better the air mobility in a specific use space, the better the adsorption effect, and the larger the contact area of ​​activated carbon and air, the higher the adsorption efficiency. In addition, the height of the activated carbon should be placed in the indoor space generally between 0.5m and 1.8m, which is because the diffuse height of the indoor polluted gas is determined by the height of the human body.

5. The main adsorption targets of household activated carbon are formaldehyde, benzene, ammonia, TVOC and other harmful substances in the air. They also have good adsorption effects on smoke and wine odor, but it is not effective for all odors, such as wood itself. The smell, activated carbon will not work, in addition, we must also recognize that the odor in the decoration is the accumulation of a variety of substances, there is a fragrance but not necessarily beneficial to the human body, the odor is not necessarily harmful to the human body, so only the deodorization is a serious Misunderstanding.

After mastering the key points of household activated carbon, it is only necessary to cooperate with the pollution control method described in "How to remove the decoration smell after the renovation of the new house?"