Can activated carbon adsorb harmful substances such as formaldehyde and benzene?

Activated carbon has a well-developed pore structure, and the adsorbed molecules enter the adsorption pores through the macropores (R 50nm) and mesopores (2nm R 50nm) through the two transportation channels Micropores (R 2nm), and the molecules and surface groups on the pore surface are combined together by van der Waals force to complete adsorption. Founded in 1996, Nanjing Mulinsen Carbon Industry Co., Ltd. is a professional activated carbon production enterprise integrating scientific research, development, production and sales. Over the past 20 years, the company has been focusing on the production of activated carbon, and has now developed into a subsidiary of Nanjing Mulinsen (deep processing base, mainly producing high-end products such as high-grade pure activated carbon and activated carbon catalysts), Hainan Mulinsen (Southeast Asia coconut shell raw material base, mainly producing coconut shell activated carbon), Gansu Mulinsen (Northwest coconut...).

It can adsorb, to be precise, it can adsorb formaldehyde in the free state, but it should be noted that every once in a while, the activated carbon needs to be taken out and exposed to the sun in order to release the adsorbed formaldehyde molecules. Formaldehyde is divided into a free state and a polymerized state, and the formaldehyde in the polymerized state will be converted into a free state first, and then volatilized.

If you are decorating, tell you a simple and effective way, put a few grapefruit in the house or put a few bowls of vinegar in the newly renovated house, which can play a certain role in removing formaldehyde and stupid harmful substances, and now there are special deodorants on the market.

Activated carbon can remove formaldehyde, but it should be noted that activated carbon and other adsorption formaldehyde removal products only have adsorption capacity, can not eliminate formaldehyde.

Activated carbon is made of high-quality anthracite, charcoal or various fruit husks as raw materials, and processed by special processes through physical or chemical methods. Activated carbon has a well-developed pore structure and specific surface area, and its adsorption performance is derived from these well-developed pore structures. The principle of activated carbon to remove formaldehyde is to use its strong adsorption force.

In addition, it is especially reminded that the most easily ignored pollution sources also come from stone decoration materials such as marble, gypsum, and ceramic tiles, which contain the harmful substance radon.

The prevention and control of decoration pollution cannot be achieved overnight, nor can it achieve immediate results through a single measure. Industry insiders said that if you want to reduce decoration pollution, you must first design reasonably, follow the principles of simplicity and practicality, and do not over-decorate. For example, in terms of materials, it is necessary to strictly select environmentally friendly and safe materials;

Ventilation is the most effective way to deal with existing indoor air pollution. You may wish to open cabinets, drawers, etc., so that pollutants can be fully released, open doors and windows for ventilation, and accelerate the spread of pollutants.

Because activated carbon has strong adsorption, it can remove formaldehyde. However, it should be noted that the working principle of activated carbon aldehyde removal is passive physical adsorption, which can only reduce the free formaldehyde in the air, and cannot penetrate deep into the furniture board to fundamentally solve the formaldehyde problem.

The adsorption capacity of activated carbon is related to the pore size and structure of activated carbon. In general, the smaller the particles, the faster the pore diffusion rate, and the stronger the adsorption capacity of activated carbon. Adsorption capacity and adsorption speed are the main indicators to measure the adsorption process.

The size of the adsorption capacity is measured by the adsorption capacity, and the adsorption rate refers to the amount adsorbed by the adsorbent per unit weight per unit time.

Applications:

In the early 50s of the 20th century, China only began to produce activated carbon. In the late 60s of the 20th century, activated carbon began to be used to remove the deodorization and odor of polluted water sources.

Activated carbon is mainly used as a solid adsorbent, which is used in chemical, pharmaceutical, environmental and other aspects to adsorb substances with high boiling point and critical temperature and organic matter with large molecular weight.

In the fields of air purification and water treatment, the application has also shown a trend of increasing application, and special high-grade carbon such as high specific surface area carbon, high benzene carbon and fiber carbon have penetrated into the fields of aerospace, electronics, communications, energy, bioengineering and life sciences.

Answer: In the early stage of the use of activated carbon, it can effectively remove formaldehyde. Because the pore has an adsorption potential, it is formed by the attraction of carbon molecules and adsorbed molecules, and the smaller the pore size, the stronger the adsorption potential. In the standard state, the free motion speed of formaldehyde molecules is about 450 meters per second, and one formaldehyde molecule collides with other molecules 109 times per second.

If the diameter of the colliding molecule matches the activated carbon pores, formaldehyde will be adsorbed. However, whether it is traditional activated carbon or modified activated carbon, due to its large pores, the adsorption capacity is limited, and the pollutants adsorbed in the activated carbon cannot be completely volatilized, and the adsorption function of the carbon cannot be completely restored, and the adsorption capacity of the activated carbon will be weakened after one month.

Activated charcoal packs do remove formaldehyde, but its usefulness is limited. Activated carbon has a porous structure, which can play a role in adsorption, and 50 grams of activated carbon can absorb one square meter of formaldehyde, so after the home is renovated, activated carbon bags can be placed in various rooms.

For example, furniture drawers, including on the floor, can be placed around. However, it should be noted that it can only play the role of adsorption, and it will be released after the adsorption is saturated, so it needs to be replaced regularly, such as every half a month.

Although the activated carbon package can indeed adsorb, but the impact of adsorption is not significant, which is also determined by its structure, so it cannot be completely attached to the activated carbon to adsorb formaldehyde, not as magical as advertised, we also need to use other means to effectively remove formaldehyde.

For example, the temperature is raised to remove formaldehyde, because the volatilization temperature of formaldehyde is related, the higher the temperature, the faster the formaldehyde volatilization. If underfloor heating is installed, it can be turned on, and formaldehyde will evaporate faster in a high temperature environment.

A more scientific and effective way can be through photocatalyst, which can decompose formaldehyde and release the air in the room and will not cause harm to the human body, just carbon dioxide and water, so the effect of air purification will be better and more thorough.

Therefore, even if activated carbon can indeed remove formaldehyde, it only plays an auxiliary role, which is the same as placing green plants indoors. If you want to remove formaldehyde at the root, you also need to use scientific methods.

Activated carbon can adsorb formaldehyde, but can not eliminate formaldehyde, when the product adsorption is full, under the conditions of moisture, heat, etc., formaldehyde may be desorbed and released again.

Activated carbon is a hydrophobic adsorbent prepared by carbon-containing substances as raw materials, such as coal, wood, fruit shells, coconut shells, walnut shells, apricot shells, jujube shells, etc. Activated carbon contains a large number of micropores, which can adsorb organic pollutants and some inorganic substances, and its adsorption capacity depends on the distribution of its own pore size and the molecular size of the adsorbed substance.

It can be seen that placing activated carbon in a newly renovated house or a new car is effective for the adsorption of formaldehyde. But the adsorption capacity of activated carbon is not unlimited, nor is it as magical as advertised by merchants. According to the southeast network, the adsorption of odor by activated carbon is mainly due to the pore structure of the carbon itself, and the odor is adsorbed into the pores without chemical reaction.

After adsorption for a certain period of time, the pores of the activated carbon will be in a saturated state, and the adsorption will also be reduced to zero. The adsorption of activated carbon is a reversible process, and after the adsorption is saturated, it will continue to be placed indoors, and the harmful gases will be released again. Therefore, after the activated carbon package is used for a period of time, it should be placed in a ventilated place and exposed to the sun for a period of time to discharge harmful gases to the outside.

The above content refers to the People's Health Network - activated carbon is not so magical, and it will cause harmful gases to be re-released if it is not replaced in time.

First of all, we can be sure that activated carbon can absorb formaldehyde and other harmful substances, this statement is also in line with everyone's perception of activated carbon, so it will be easy for everyone to get into the set, in fact, activated carbon to absorb formaldehyde is to change the concept, so can everything that can absorb formaldehyde remove formaldehyde? Sand and soil these things can also absorb formaldehyde, waterworks are using clean sand to filter water, in fact, these things are used in their own voids to put formaldehyde into it, activated carbon is actually using its own voids to put formaldehyde into it, speaking of which, we will feel that as long as we can suck formaldehyde into it, so we will listen to the words of activated carbon merchants: formaldehyde release is a long-term process, so activated carbon to absorb formaldehyde can be effective for a long time. This statement is completely confusing, because even if you don't do any formaldehyde removal measures, then the indoor formaldehyde will naturally be reduced after a long time!

Secondly, that is, everyone thinks that the charcoal bag is cheaper, and it is more convenient to use, it is to buy it home and put it in the cabinet or drawer, so everyone will also seek activated carbon to remove formaldehyde, but everyone forgets that the activated carbon is only put into the formaldehyde, not the formaldehyde is also decomposed after the formaldehyde is put in, so these pores of the activated carbon will always be filled with formaldehyde, once filled with formaldehyde, not only will it not absorb formaldehyde, Moreover, the formaldehyde that was originally absorbed into it will be released, which will cause secondary pollution to the indoor air, so the activated carbon should be replaced once in a week's time period, and the small charcoal bag can not absorb much formaldehyde!

Finally, these merchants who sell activated carbon will say: although activated carbon is easy to absorb saturation, you can take the activated carbon to the outdoor sun every other week to dry, so that the formaldehyde that is sucked in will be dried out, and then it can be reused. I believe that many people do not have the time to do this, and the activated carbon in the sun does not have much effect at all, because only when the temperature reaches more than 120 degrees Celsius, the activated carbon can spit out the formaldehyde that is sucked in!

Activated carbon is a well-known purification material, it has a strong adsorption effect and is affordable, in the case of sufficient use can play a good role in purification, but activated carbon only adsorption, and can not decompose formaldehyde, adsorption to a certain amount is prone to adsorption saturation problems, so the use of activated carbon purification must be timely drying and replacement, to avoid adsorption saturation caused by secondary pollution.

For the formaldehyde exceeding the standard in the new house, we can also deal with it through the following methods, so as to move into the new house faster and safer.

1. Pay attention to ventilationVentilation is the simplest and most effective way to remove formaldehyde, and ventilation can effectively reduce the formaldehyde content in the room. But we will inevitably encounter situations in our lives where we can't open the windows, such as not having time to open the windows or on rainy days, so we can't rely on ventilation alone, and we must use it in combination with some other methods.

Second, with the use of aldehyde removal productsActivated carbon and baizao are currently more commonly used, both are pure physical adsorption purification, compared with chemical purification is more safe and reliable, the difference is that activated carbon needs to be dried once a month or so, to avoid adsorption saturation, baizao is relatively convenient to use, it can decompose formaldehyde, can be sun-free, put at home completely careless, do not worry about adsorption saturation and secondary pollution, more suitable for people who have a fast pace of life and no time to take care of drying.

3. Place green plantsFormaldehyde removal in the new house is a systematic work, it is impossible to completely remove it at once, for the sake of safety, you can put some pothos, spider plant, tiger piran, yew and so on at home before moving in, these green plants can also add green to the new house while playing a purifying role.

Fourth, salt water to wipe the furnitureThe formaldehyde in the furniture plate will be slowly released through the surface of the furniture, wipe the surface of the furniture with mild salt water, can effectively take away the harmful substances attached to the surface of the furniture, and have a certain effect on removing the odor of furniture.

Activated carbon still uses a structure with a lot of pores for adsorption, which is a kind of physical adsorption. In fact, the molecular structure of activated carbon is very special, it contains very developed pores, when there is gas or liquid through the activated carbon, it can be adsorbed in the activated carbon, and then it can not continue to be released, that is, because there are many air raids, so the adsorption capacity is very strong.

Moreover, activated carbon generally adopts the method of static adsorption, put the activated carbon in the air, as long as there is formaldehyde free in the surrounding environment, as long as the activated carbon can perceive it, this part of the activated carbon can be adsorbed. However, if the formaldehyde in a space does not diffuse to the vicinity of the activated carbon, then there is no way to be absorbed by the activated carbon, so the range of adsorption is greatly affected, and the activated carbon can only be fixed in one place and cannot be moved freely to adsorb.

At the same time, the affinity coefficient of activated carbon for formaldehyde is not too high, but the affinity coefficient for benzene is higher. Moreover, activated carbon is originally a physical adsorption method, so as long as formaldehyde can be adsorbed to the inside of the activated carbon, the indoor formaldehyde concentration will be greatly reduced. However, this effect is not too great, it is difficult to absorb all the formaldehyde in the entire space, unless the activated carbon is placed in every place in the room, otherwise the formaldehyde can not diffuse to the vicinity of the activated carbon, it cannot be absorbed.

Of course, activated carbon is not targeted for formaldehyde, as long as there is a peculiar smell or toxic gas, it will be absorbed. Therefore, activated carbon can easily reach a saturated state, so the adsorbed formaldehyde in it is still very small. Moreover, there is a very big disadvantage of activated carbon adsorbing formaldehyde, that is, even if activated carbon adsorbs a lot of formaldehyde, when the indoor temperature rises, these formaldehyde will be released again.

Therefore, the danger is still very high, and it is likely to cause more serious consequences.