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Adsorption Isotherms for Concentrated Aqueous-Organic Solutions (CAOS).

Lavi1, Marmur

  • 1Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel

Journal of Colloid and Interface Science
|September 22, 2000
PubMed
Summary

This study presents new adsorption isotherms for concentrated solutions, differing from existing models. Calculations reveal potential for two maxima and singularities near phase separation.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Thermodynamics

Background:

  • Understanding adsorption in concentrated aqueous-organic solutions is crucial for chemical processes.
  • Existing theoretical models may not accurately describe non-ideal, high-concentration systems.
  • Experimental data on surface tension and activity coefficients are key to modeling adsorption.

Purpose of the Study:

  • To calculate and present adsorption isotherms for concentrated aqueous-organic solutions.
  • To investigate the occurrence of maxima and singularities in adsorption isotherms.
  • To compare calculated isotherms with existing theoretical models.

Main Methods:

  • Utilizing the Gibbs adsorption equation for calculations.
  • Employing experimental data for surface tension.

Related Experiment Videos

  • Using experimental data for activity coefficients.

    • Main Results:

    • Calculated adsorption isotherms exhibit unique characteristics at high concentrations.
    • Two maxima are predicted in the adsorption isotherm under certain conditions.
    • Singularities in adsorption isotherms are observed near phase separation points.

    Conclusions:

    • The calculated adsorption isotherms are qualitatively distinct from current theoretical models.
    • High concentrations and solution nonideality significantly impact adsorption behavior.
    • The findings provide a more accurate representation of adsorption in complex solutions.