Adsorbent

to gather (a gas, liquid, or dissolved substance) on a surface in a condensed layer:
Charcoal will adsorb gases.
Contemporary Examples

The reason it works is that coconut charcoal is in adsorbent.
How to Recover from Christmas Dave Asprey December 24, 2013

adjective
capable of adsorption
noun
a material, such as activated charcoal, on which adsorption can occur
verb
to undergo or cause to undergo a process in which a substance, usually a gas, accumulates on the surface of a solid forming a thin film, often only one molecule thick: to adsorb hydrogen on nickel, oxygen adsorbs on tungsten Compare absorb (sense 8)
v.

1882, transitive (intransitive use attested from 1919), back-formation from adsorption (1882), coined in German from ad- + -sorption, abstracted from absorption. See absorb. Related: Adsorbent; adsorption.

adsorbent ad·sor·bent (ād-sôr’bənt, -zôr’-)
adj.
Capable of adsorption. n.

An adsorptive substance.

A pharmacological substance capable of attaching other substances to its surface without any chemical action.

An antigen or antibody used in immune adsorption.

adsorb ad·sorb (ād-sôrb’, -zôrb’)
v. ad·sorbed, ad·sorb·ing, ad·sorbs
To take up by adsorption.