Adsorption

Adsorption is a surface phenomenon in which molecules, ions, or atoms from a gas, liquid, or dissolved solid adhere to the surface of a solid or liquid, forming a thin film. This process involves the accumulation of these species at the surface of a material rather than changing its bulk composition. Adsorption can be classified into two main categories: 1. **Physisorption (Physical Adsorption)**: This type involves weak van der Waals forces or hydrogen bonds and is generally reversible.