adsorption
Let an agent explain adsorption and distinguish it from absorption, describe physisorption and chemisorption and the main isotherm models, relay applications and measurement methods, and route design questions to engineering references.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain adsorption and distinguish it from absorption, describe physisorption and chemisorption and the main isotherm models, relay applications and measurement methods, and route design questions to engineering references.
The adhesion of atoms, ions or molecules from a gas or liquid to a surface, forming a film on the adsorbent, either by weak physical forces or by chemical bonding; adsorption underlies activated carbon filters, catalysis, chromatography, gas storage and many separation processes, and is described by isotherms that relate the amount adsorbed to pressure or concentration.
What it is for: Separation, purification, catalysis and storage.
It can be explain the process and its kinds; distinguish adsorption from absorption; explain isotherms and measurement; describe applications.
Distinguishing features
Surface phenomenon
Physical versus chemical binding
Described by isotherms
Reversible by desorption in many cases
What it looks like
Not visible; a surface layer of molecules on a solid or liquid.
Physical character
physisorption enthalpy: about 5-40 kJ per mole - typical
chemisorption enthalpy: about 40-400 kJ per mole - typical
activated carbon surface area: about 500-1500 square metres per gram
How it is recognised
Accumulation on a surface
Physisorption by weak forces or chemisorption by bonds
Absorption takes material into the bulk
Related models
is a kind of - a surface form
is a kind of - in engineering
is contrasted with - uptake into the bulk
is described by - the relation
In practice
Families and kinds
physisorption
chemisorption
gas adsorption on solids
adsorption from solution
isotherm models such as Langmuir, Freundlich and BET
pressure and temperature swing adsorption processes
Standards and regulation
ISO 9277 for surface area by gas adsorption
IUPAC recommendations on adsorption terminology
Failure modes and hazards
Confusing adsorption with absorption
Saturation and breakthrough of adsorbents
Heat release in adsorption beds
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.adsorption
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Concept What adsorption is.
Definition.
Definition
Definition and kinds.
Definition
Definition.
- What is adsorption, and how do physisorption and chemisorption differ? definition
- Is the question about adsorption or absorption? boundary
Isotherms
Isotherms.
Isotherms
Isotherms.
- What do the Langmuir, Freundlich and BET isotherms describe? definition
- Which entry fits a specific isotherm? action
Measure Measurement.
Method.
Methods
Methods.
Methods
Methods.
- How are adsorption capacity and surface area measured? measurement
- Which standards apply? provenance
Data
Data.
Data
Data.
- What typical values do common adsorbents show, with sources? measurement
- Which references are standard? provenance
Apply Applications.
Engineering.
Separation
Separation and purification.
Separation
Separation.
- How is adsorption used in water and air purification, gas separation and chromatography? provenance
- Which entry fits activated carbon? action
Catalysis
Catalysis and storage.
Catalysis
Catalysis.
- What role does adsorption play in catalysis and gas storage? provenance
- Which entry fits heterogeneous catalysis? action
Learn Theory and teaching.
Study.
Theory
Theory.
Theory
Theory.
- How do thermodynamics and kinetics describe adsorption? provenance
- Which entry fits surface science? action
Teach
Teaching.
Teach
Teaching.
- How is adsorption taught, and which misconceptions arise? provenance
- Which entry fits physical chemistry? action
What the second pass must settle
- Should isotherm models be separate entries?
- How should standards be linked?
- The registry entry has merged aliases for isotherms and kinds; should they be split off?