Explanation

The phenomenon that the atoms (or molecules) of adsorbate and the atoms (or molecules) on the surface of adsorbent (solid or liquid) undergo electron transfer or public ownership, forming ionic bond, covalent bond or a combination of both, so as to adsorb on the surface of adsorbent. Metal atoms may also form metal bond adsorption on metal substrates. Due to strong bond binding, the heat released during adsorption (heat of adsorption) is up to several electron volts per atom. The adsorption layer is very stable, not easy to desorb, and irreversible. Adsorption and desorption generally require a certain amount of activation or conditioning energy, so temperature has a greater impact on the adsorption and desorption rate. Except at extremely low temperature, the visible adsorption is usually chemical adsorption. Due to the need for activation, the rate of chemical adsorption and desorption is low. chemical adsorption is limited to single-layer adsorption, which is similar to chemical reaction and has obvious selectivity.

Classification