Activated Carbon Adsorption Principle

Activated carbon is made of carbon-containing substances as raw materials, such as coal, wood, bones, hard fruit shells, petroleum residues, etc., after high-temperature carbonization. The carbonization temperature is about 300 ~ 4000 ℃, pyrolysis of raw materials into residues, the activation temperature is about 920 ~ 9600 ℃ forced steam into the pores caused by the very developed carbon. The biggest feature of activated carbon is its adsorption performance. Adsorption is the process of attaching a substance to the surface of another substance. It can occur between gas-liquid, gas-solid, and liquid-solid phases. Generally, porous solid phase materials are used as ion exchange adsorbents. Adsorption can be divided into:

a. Physical adsorption: It is the adsorption caused by the molecular gravity between the adsorbate and the adsorbent: it also includes the filtration adsorption of the pore size.

b. Chemisorption: It is the adsorption caused by the chemical interaction between the adsorbate and the adsorbent due to the chemical action of the chemical bond force.

c. Ion exchange adsorption: It is the electrostatic attraction of the adsorbate that gathers on the charged point on the surface of the adsorbent, and the adsorbent also emits an equivalent amount of ion.

The adsorption principle of activated carbon (coconut shell activated carbon) contains the above three types. Physical adsorption is manifested in the pore development of activated carbon. When the impurity diameter is larger than the pores of activated carbon, it will be blocked; chemical adsorption is composed of ten activated carbon pores. The substances can react with the substances in the water to achieve the filtration of chroma and odor. The ion adsorption also has a similar principle to chemical adsorption.