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ADSORPTION PowerPoint PPT Presentation


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ADSORPTION. Surface Activity of Solutes. Solute, c. . .  o. Solute, c. Solutes that decrease surface tension are called “surfactants”. Here is me. I am trying to get your attention now. . . Adsorption. More solute we have more surface tension (free energy) is - unfavorable

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ADSORPTION

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ADSORPTION


Surface Activity of Solutes

Solute, c

o

Solute, c

Solutes that decrease surface tension are called “surfactants”


Here is me. I am trying to get your attention now.


Adsorption

More solute we have more surface tension (free energy) is - unfavorable

Solute is repelled by

surface

More solute we have less surface tension (free energy) is - favorable

As a result solute concentrates onto surface - adsorption


Specific Adsorption

Surface area, 

 - thickness of

adsorption layer

“Volume” of adsorption layer, .

Solute concentration, c

Surface concentration, c 

Specific adsorption, 


Adsorption Isotherms

Langmuir isotherm

max

(for a solution)

c or p

(for a gas)


More Adsorption Isotherms

(a) Langmuir

(b) Multilayer formation

first layer

c or P

c or P

(c) “Positive cooperativity”

(d) Hysteresis

c or P

c or P


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