I would like to have your opinion on which approaches are normally used to determine multicomponent adsorption isotherms in complex mixtures. Most approaches I see use either pure component isotherms which are then combined in a multicomponent model or column experiments where isotherm parameters are regressed to fit the chromatograms.
I was wondering if it wouldn't be simpler to use batch uptake experiments, using relative concentrations, to determine the multicomponent isotherm data:
https://www.researchgate.net/publication/323784361_Adsorption_isotherm_determination_with_complex_mixtures
Despite the limitation of only using relative concentrations, it could avoid extensive compound identification and quantification. Moreover, the obtained adsorption data would correspond to the actual complex matrix.
I would appreciate your input.
Think I understood your question up to some extent.
Other than doing isotherm studies for a single component, isotherms for multi component systems are doing to get an idea about how it behave in the reaction mixture which can be use to almost prediction of the real system.
Refer this article, which contains the same phenomenon. These equations can be used to predict the results.
Article Adsorption of binary mixtures of cationic dyes
Is this what you need to know, or any other ..?
Thank you both for your answers. What I wanted to discuss with this question is not how to model liquid multicomponent adsorption isotherms, but more how to determine them.
From what I know, two approaches are usually taken: batch uptake experiments, where the involved compounds are determined and quantified by HPLC, for example; inverse modelling approach where column experiments are performed in order to regress the parameters of a given multicomponent model.
What I wanted to have is a discussion about the different approaches and if it wouldn't be preferable, in some cases and when possible, to determine the multicomponent isotherms by batch uptake, but only using relative concentrations. The advantage would be that no molecules would have to be identified, but only peak areas (in the case of the HPLC) would be needed.
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