Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hi guys,
    I'm doing some work on Adsorption and it mentions 'Determination of adsorption isotherms'. there are two methods of analysis : Langmuir Isotherm and Freudlich isotherm.

    What I don't understand is the term Isotherm and the graphs that go with the methods of analysis

    I've searched it but I still don't understand it either in or out of context.

    So, what does Isotherm mean?

    Thanks for any sort of explanation
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    (Original post by JustMee :))
    Hi guys,
    I'm doing some work on Adsorption and it mentions 'Determination of adsorption isotherms'. there are two methods of analysis : Langmuir Isotherm and Freudlich isotherm.

    What I don't understand is the term Isotherm and the graphs that go with the methods of analysis

    I've searched it but I still don't understand it either in or out of context.

    So, what does Isotherm mean?

    Thanks for any sort of explanation
    ISO = "the same"
    THERM = "heat"
    Offline

    19
    ReputationRep:
    (Original post by JustMee :))
    x
    Both the Langmuir and Freundlich isotherms plot the extent of adsorption against adsorbate concentration (either in the air or in solution) at a given temperature (hence isotherm). The two isotherms can be used to model the same behaviour; the key difference lies in the mathematical formulation of the isotherm.
    Offline

    3
    ReputationRep:
    (Original post by JustMee :))
    Hi guys,
    I'm doing some work on Adsorption and it mentions 'Determination of adsorption isotherms'. there are two methods of analysis : Langmuir Isotherm and Freudlich isotherm.

    What I don't understand is the term Isotherm and the graphs that go with the methods of analysis

    I've searched it but I still don't understand it either in or out of context.

    So, what does Isotherm mean?

    Thanks for any sort of explanation
    The graphs are a plot of surface coverage vs pressure of adsorbate. Don't worry too much about actually understanding this! I did the freundlich isotherm for my coursework and I didn't really understand the isotherm properly. Focus more on the theory of adsorption!

    The langmuir (I believe) is has a simpler theory to it (it can be very easily derived).
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What newspaper do you read/prefer?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.