What is activated carbon?
Activated carbon is a porous carbonaceous material with a highly developed pore structure. The porous structure of activated carbon provides a large amount of surface area and is in full contact with gases (impurities), thereby imparting unique adsorption properties to activated carbon. It makes it very easy to achieve the purpose of absorbing and collecting impurities. Just like magnetic force, all molecules have mutual attraction. Because of this, a large number of molecules on the pore walls of the activated carbon can generate strong gravitational force, thereby attracting harmful impurities into the pores. However, not all activated carbon can absorb harmful gases. Only when the pore structure of activated carbon is slightly larger than the diameter of harmful gas molecules, it can make the harmful gas molecules completely enter (too large or too small) to achieve the best adsorption effect.
Adsorption performance of activated carbon
The adsorption performance of activated carbon is determined by the combination of the physical and chemical properties of activated carbon and adsorbate. The effect of these factors on the adsorption of activated carbon is now studied from the shape change of the adsorption isotherm:
1) The activated carbon has the same pore size. When the specific surface area increases, the adsorption capacity increases, and the adsorption isotherm expands upward; the specific surface area is the same, the pore diameter becomes smaller, the adsorption force increases in the low concentration region, and the shape of the adsorption isotherm is toward the low concentration side. compression.
2) When the molecular weight of the adsorbate increases, the adsorption isotherm compresses to the lower concentration side; when the polarity of the adsorbate becomes larger, the combination with the solvent water is enhanced. The adsorption isotherm is pressed down and further expanded to the high concentration side.
Main factors affecting the adsorption of activated carbon
1) Properties of activated carbon
The physical and chemical properties of activated carbon determine its adsorption effect. The nature of activated carbon is related to the processing method and activation conditions of raw materials used in the production of activated carbon. Activated carbon for water treatment should have three requirements: large adsorption capacity, fast adsorption speed and good mechanical strength. The adsorption capacity of activated carbon is mainly related to the specific surface area of activated carbon, and the specific surface area is large, and the number of micropores is large. The adsorption capacity of the activated carbon can be adsorbed on the microporous wall.
The requirements for activated carbon in ductless fume hoods are extremely high.
1, in order to ensure a strong adsorption performance, it is necessary to use coconut shell as the raw material of activated carbon.
2. Huafeng Technology Co., Ltd. has established a strict internal inspection standard in order to ensure the adsorption efficiency of the filter.
3, the establishment of internal inspection standards is obtained through numerous experiments and optimization, it must ensure that the downstream concentration of the filter is within the safe value range, the filter has a maximum adsorption amount.
4. According to the different adsorption chemicals, activated carbon can be loaded with some chemical substances in the production process by technical means to enhance the adsorption amount of certain or certain chemical substances.
5, Activated carbon is only a part of the filter module, in order to ensure the adsorption effect, Huafeng Technology adds different adsorption media according to different types of modules.
