Senior engineer Zhang Gong of Shijiazhuang Bihao Better Environmental Engineering Co., Ltd., a designated formaldehyde removal enterprise in Shijiazhuang, said: There are many brands of activated carbon on the market, but the quality is uneven, and many of them are passed off as ordinary carbon. Activated carbon. So, how to identify and select activated carbon? Let’s take a look together.

1. Look at the density. The more pores the activated carbon has, the higher the adsorption performance, the looser the activated carbon, the lower the relative density, the lighter the feel, and the smaller the volume under equal weight packaging. big. It is recommended to purchase activated carbon products with low density, light feel and large volume of equal weight.

2. Look at the size. The smaller the activated carbon particles, the larger the contact area with air, the larger the specific surface area, and the better the adsorption performance. However, the smaller the particles, the greater the loss and dust during the crushing and production process. The more, the higher the cost. Therefore, in order to reduce costs, many manufacturers use large particle activated carbon. Of course, the performance is not good. Generally, activated carbon with a particle size of about 0.5 mm not only achieves the best performance, but also ensures that it is not powder and has no pollution. . It is recommended to choose activated carbon products with particle diameters between 0.42-0.85 mm.

3. Look at the components. Activated carbon absorbs harmful gases based on pore size. Different harmful gases have different molecular weights and different particle sizes. The gaps of activated carbon must be between 0.45-2 nanometers to absorb toxic gases such as formaldehyde. Gas, internationally coconut shell carbon is the first choice activated carbon to absorb odors and pollution such as benzene, and gas phase spherical microporous activated carbon is the most ideal formaldehyde adsorption carbon. It is recommended to purchase a comprehensive adsorption product mixed with coconut shell activated carbon and gas phase spherical microporous activated carbon. Coconut shell is not necessarily the best, it must match the pore size of harmful gas molecules.

4. Look at the dust. In the process of producing activated carbon, the crushed raw materials must be processed to remove dust. Otherwise, there will be too much dust and poor cleanliness, which will cause pollution to the human body and objects. The inferior activated carbon on the market is To reduce costs, there is no post-processing. The dust is very large. Dark-colored packaging bags are often used. Small charcoal bags are dirty to the touch. When used, they will stain items and cause secondary pollution. It is recommended to choose a small charcoal bag, which is a white breathable non-woven bag that does not feel dusty or dirty.

5. Look at the bubbles. Put a small handful of activated carbon into the water. Since the water molecules are small, the water will gradually immerse into the pore structure of the activated carbon, forcing the air in the pores to be discharged, thus producing a series of extremely fine bubbles. A small line of bubbles will be pulled out of the water, and at the same time it will make a slight sound of bubbles. The better the performance of the activated carbon, the more severe this phenomenon will be. The longer it goes.

6. Look at the carbonized material. Carbonized material is carbon that has only gone through the carbonization process without the activation process. It is not a real activated carbon. The activation process is the most important process of creating a pore structure in the activated carbon manufacturing process. It lacks this The carbonized material in the process has almost no adsorption properties. Since the carbonized material does not undergo the process of activation and pore creation, 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.

7. Look at the brand. There are many brands of so-called activated carbon in the general market, many of which are shoddy and of varying quality. When purchasing, we should choose activated carbon produced by state-certified manufacturers with certain strength and brand awareness. For example, check whether there are honorary qualifications issued by national authoritative organizations. Of course, many other so-called honorary certificates can be purchased for tens of thousands of yuan, but generally provincial or national famous trademarks must have strong enough comprehensive strength to win them. . Secondly, the trademark must be a registered trademark for more than 3 years. As for the choice of activated carbon brand, it is recommended to choose products produced by professional activated carbon manufacturers. Warm reminder: Activated carbon needs to be dried outdoors after being used for a period of time. The purpose of drying is to release the internal space occupied by moisture through sun exposure to better absorb harmful gases. It is recommended to expose it to the sun for 3-5 hours every 15 days or so.