Activated carbon is obtained by oxidative activation of solid carbonaceous materials (such as coal, wood, hard fruit shells, kernels, resins, etc.) by carbonization at a high temperature of 600-900°C under the condition of isolation from the air, and then oxidized and activated with air, carbon dioxide, water vapor, or a mixture of all three gases at 400-900°C.
Because the activation process is a microscopic process, i.e., a large number of molecular carbide surface erosion is point erosion , so it causes the surface of the activated carbon with countless tiny pores. Most of the micropores on the surface of activated carbon are between 2 and 50 nm in diameter, and even a small amount of activated carbon has a huge surface area of 500 to 1500 m2 per gram of activated carbon, and almost all applications of activated carbon are based on this feature of activated carbon.?
Expanded Information:
Adsorption Mechanism
Activated carbon adsorption refers to the adsorption of one or more substances in the water by utilizing the solid surface of the activated carbon to purify the The purpose of water quality. The adsorption capacity of activated carbon is related to the pore size and structure of activated carbon. Generally speaking, the smaller the particles, the faster the pore diffusion speed, the stronger the adsorption capacity of activated carbon.
Adsorption capacity and adsorption rate are the main indicators of the adsorption process. The size of the adsorption capacity is measured by the adsorption amount, and the adsorption speed refers to the amount of adsorption per unit weight of adsorbent per unit time. In water treatment, the adsorption rate determines the contact time between the adsorbent and the sewage.
Baidu Encyclopedia-Activated Carbon