Activated carbon filter factory share: Why the specific surface area of activated carbon is large but the effect of formaldehyde removal is general.

Some customers often ask about activated carbon formaldehyde removal when customizing air filters: why some activated carbon has a large specific surface area, and the adsorption value of CTC and iodine is also high, but the adsorption performance of formaldehyde, ammonia, acetaldehyde, and other gases in cigarettes is poor. Refer to the following activated carbon filter factory to share: Why activated carbon has a large specific surface area but general formaldehyde removal effect. Generally, we all think that activated carbon absorbs formaldehyde, and the physical adsorption performance of activated carbon has a great relationship with the specific surface area and the micropore size of activated carbon. If the micropore size of activated carbon is very close to the diameter of a gas, then its adsorption force for this gas is very strong, and it is not easy to desorption after adsorption. However, for gases such as formaldehyde, acetaldehyde, and ammonia, due to their low boiling point and less obvious polarity, it is necessary to increase the specific size of micropores to adsorb them, but this technology is more difficult to control. Therefore, the adsorption effect of the physical adsorption of activated carbon on formaldehyde and other gases is often not very ideal. Especially in the case of coexistence with other gases, activated carbon preferentially absorbs other gases that are better adsorbed, and for formaldehyde and other gases, it is rarely adsorbed, and it is easier to desorption, once desorption, it will cause secondary pollution. Therefore, for the adsorption of organic gases such as formaldehyde, there is no very important relationship with the size of the specific surface area, for the Henkaes activated carbon filter factory, the principle of chemical adsorption is used to modify it. It is commonly used to add chemicals or catalysts to activated carbon, and chemical process conditions can also be modified. It can completely decompose the gas and convert it into formic acid, and also avoid secondary pollution. Suitable activated carbon loading agents and modification methods can improve the adsorption efficiency of activated carbon for specific gases several times to dozens of times.