Adsorption
| Formula / Notation | Langmuir: θ = KP/(1+KP); BET isotherm for multilayer |
|---|---|
| Also Known As | Surface adsorption; physisorption; chemisorption; sorption (general term including adsorption + absorption) |
What is Adsorption?
Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid onto a solid or liquid surface. The adsorbed material is called the adsorbate and the surface is called the adsorbent. It is distinct from absorption (where molecules penetrate into the bulk of the material). Physisorption involves weak van der Waals forces; chemisorption involves chemical bonding.
Formula & Notation
Other Names / Synonyms: Surface adsorption; physisorption; chemisorption; sorption (general term including adsorption + absorption)
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid onto a solid or liquid surface. The adsorbed material is called the adsorbate and the surface is called the adsorbent. It is distinct from absorption (where molecules penetrate into the bulk of the material). Physisorption involves weak van der Waals forces; chemisorption involves chemical bonding.
Activated carbon filters for water and air purification; chromatography (stationary phase adsorption); catalysis (reactants adsorb on catalyst surface); gas masks and respirators; removing pollutants from wastewater; pharmaceutical drug delivery
Adsorption processes themselves are generally safe. However, activated carbon and zeolites can adsorb toxic gases — spent adsorbents must be disposed of carefully. Some adsorbents (silica gel with indicator) may contain toxic compounds.
The formula or notation for Adsorption is: Langmuir: θ = KP/(1+KP); BET isotherm for multilayer