Activated carbon is a specially treated carbon material. Through high-temperature carbonization and activation processes, a highly developed pore structure is formed in raw materials (such as coal, wood, fruit shells, etc.). Its core features include:

Huge specific surface area: The surface area of each gram of activated carbon reaches 500~1500 square meters, which is equivalent to the size of a football field, giving it strong adsorption capacity.

Three-level pore structure:

Micropores (<2nm): accounts for more than 95% of the surface area and is the main place for adsorbing small molecular substances.

Mesoporous pores (2~50nm): Adsorb larger molecules (such as some organic matter).

Large pores (>50nm): As a channel for substances to enter micropores.

Surface chemical activity: The oxygen-containing and hydrogen-containing groups (such as carboxylic groups and phenolic hydroxyl groups) formed during the activation process make them have selective adsorption ability, such as acidic surface functional groups are more likely to adsorb alkaline substances.