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Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...
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Updated: May 18, 2026

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Dynamic adsorption of catechol at the goethite/aqueous solution interface: a molecular-scale study.

Yanli Yang1, Wei Yan, Chuanyong Jing

  • 1State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 21, 2012
PubMed
Summary

Catechol adsorption on goethite involves molecular-level mechanisms. Inner-sphere complexes form, with adsorption varying by pH and surface coverage, influencing hydroxyaromatic compound transport.

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Area of Science:

  • Environmental Chemistry
  • Surface Science
  • Mineralogy

Background:

  • Hydroxyaromatic compounds, like catechol, are environmental contaminants.
  • Understanding their interaction with mineral surfaces, such as goethite, is crucial for predicting environmental fate and transport.
  • Molecular-level insights into adsorption mechanisms are needed.

Purpose of the Study:

  • To investigate the dynamic adsorption process of catechol on goethite at the molecular scale.
  • To elucidate the adsorption mechanisms at the goethite/aqueous interface.
  • To determine the influence of pH and ionic strength on catechol adsorption.

Main Methods:

  • Macroscopic adsorption experiments
  • Flow-cell Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy
  • 2D Infrared (IR) correlation analysis
  • Quantum chemical calculations

Main Results:

  • Catechol adsorption is enhanced at higher pH.
  • Adsorption is independent of ionic strength due to inner-sphere complex formation.
  • Catechol forms mononuclear monodentate and binuclear bidentate configurations between pH 5 and 9.
  • Mononuclear structures convert to binuclear complexes under basic conditions and increased surface coverage.

Conclusions:

  • Catechol adsorption on goethite is pH-dependent and forms inner-sphere complexes.
  • The adsorption configuration shifts from monodentate to bidentate with increasing pH and surface coverage.
  • These findings enhance understanding of hydroxyaromatic compound behavior in the environment.