Distinguishing the advantages and disadvantages of activated carbon

1. Look at the volume:
The higher the adsorption of activated carbon, the more pores, the looser the activated carbon, and the lighter the relative density. Therefore, the better the adsorption of activated carbon, the lighter it feels, and the larger the volume under the same weight. Therefore, good activated carbon will feel lighter. In the case of the same weight package, activated carbon with good performance will be much larger than inferior activated carbon. With the increase of adsorption, the production cost of activated carbon will be higher, and it is a geometric progression. Growth, unactivated coconut shell carbon (specific surface area 300-500 square meters per gram), costs only 2.5 yuan per kilogram, which is the motivation for selling low-adsorption activated carbon as high-adsorption activated carbon in the market. .

2. Second, look at the particle size:
The smaller the activated carbon particles, the larger the contact area with the air, the larger the specific surface area, and the better the adsorption effect, but the smaller the particles, the greater the loss and the more dust during the crushing process, so many manufacturers use them in order to reduce costs. The effect of large particle activated carbon is of course not good, and the performance of activated carbon with particles larger than 2mm is very poor.

3. Look at the ingredients three times:
Granular coconut shell activated carbon with a size of 0.42~0.85mm is good, because the two national standards on indoor air quality, GB50325 and GB/T18883, have clearly stipulated that the test method for benzene in indoor air should use: "coconut shell activated carbon : 20-40 mesh (0.42mm~0.85mm size)". Inferior products on the market: multi-sampling industrial cylindrical coal-based activated carbon; or large-grained fruit shell charcoal, with a particle diameter greater than 2mm, or coconut shell charcoal; and granular bamboo charcoal, because bamboo charcoal is not activated carbon at all, and the odor absorption effect is better. impossible to talk about;

4. Four look at the dust:
The first principle of using activated carbon is not to make things dirty. To produce activated carbon, post-processing must be carried out, that is, to remove dust from crushed coconut shells, otherwise there will be too much dust and the cleanliness will be very poor. It is very dirty, and the result is that if inhaled, it will be harmful to the human body, and the surrounding items will be polluted. At present, in order to reduce the cost of low-quality activated carbon on the market, there is no post-treatment of activated carbon ash, the dust is very large, and the small carbon bag It will be dirty if you hand mold it, and it will also stain the cabinet and surrounding items when you use it.

5. Five companies to look at:
It must be a company specializing in the production of activated carbon. The manufacturer directly produces, the quality is excellent, the cost is not high, and the cost performance is good. Most of the manufacturers of low-quality activated carbon on the market are trading companies, and there are even building materials cities that produce activated carbon. Manufacturers have no production capacity at all, let alone product standards and enterprise standards, so the quality can be imagined.

6. Six look at the outer packaging:
The outer packaging of activated carbon must be sealed, otherwise it will fail, and products with breathable outer packaging should not be purchased.

7. Look at the size of the small charcoal bag:
Activated carbon is a passive adsorption of harmful gases, so small carbon bags are scattered and placed near the pollution source, the adsorption effect will be more direct and effective, generally made into small bags of 30~50g/bag, those large bags of several hundred grams , cannot be scattered and placed, the effect of use is of course not good.

8. Look at the bubbles eight times:
Put a small amount of activated carbon into the water, due to the penetration of water, the water will gradually soak into the pore structure of the activated carbon, forcing the air in the pores to discharge, thereby generating a series of extremely small bubbles, and pulling out a small bubble line in the water, At the same time, there will be a slight sound of bubbles, which is very interesting. The more intense this phenomenon occurs and the longer it lasts, the better the adsorption of activated carbon will be.

9. Why bamboo charcoal is not suitable for air purification:
Bamboo charcoal is made by firing old bamboo at high temperature. Due to the loose texture and low hardness of bamboo charcoal, under the action of external force, the micropores are easy to block and deform, and it is difficult to maintain the original shape. Regular activated carbon manufacturers do not use bamboo to produce activated carbon. In addition, the pore diameter of bamboo charcoal is larger than that of shell charcoal and coal, which is not conducive to the adsorption of gas molecules. Even if it is adsorbed, it is easy to desorb. The bamboo charcoal sold in the market is only fired at high temperature without activation treatment, so it can only be called charcoal, not activated carbon at all, let alone air purification activated carbon. Bamboo charcoal is recognized by everyone as a health care product, but it is not suitable as a product for professional gas phase adsorption and decoration pollution. Consumers are advised not to be credulous because of misleading publicity and low prices of bamboo charcoal, and beware of being deceived.

10. What is carbonized material:
Carbonized material is the carbon that only goes through the carbonization process. The carbonized material can only become real activated carbon through the "activation" process, and the activation process is the most important process of creating pore structure in the activated carbon manufacturing process. The carbonized material that lacks this process can be Said hardly any adsorption properties. Since the carbonized material has not undergone the process of activation and pore formation, the surface is smoother than activated carbon, and the color is whitish, with a slight metallic luster. It feels harder than activated carbon and is much heavier.