Powdered activated carbon

The decolorization principle of powdered activated carbon mainly relies on its strong adsorption capacity. Specifically, this process includes several key steps:

Physical adsorption:

Activated carbon has a large specific surface area and porous structure, which enables it to provide a large number of adsorption sites. During the decolorization process, the pigment molecules in the solution are attracted to the surface of the activated carbon and enter its tiny pores, and are fixed on the surface and pores of the activated carbon through van der Waals forces (weak intermolecular forces).

Chemical adsorption:

In addition to physical adsorption, some functional groups on the surface of activated carbon (such as carboxyl, hydroxyl, etc.) can also react chemically with pigment molecules to further enhance the adsorption effect. Chemical adsorption is usually stronger than physical adsorption and can firmly fix certain specific colored impurity molecules.

Selective adsorption:

Activated carbon also has a certain selectivity for the adsorption of pigment molecules. Depending on factors such as the size, shape and polarity of the pigment molecules, activated carbon will more effectively adsorb certain specific types of pigments. This selective adsorption can help remove specific pigment impurities more effectively.

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