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Related Concept Videos

Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
Adsorption Isotherms I01:29

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...
Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and solvents...
Correlation of Experimental Data01:23

Correlation of Experimental Data

Dimensional analysis simplifies complex physical problems and guides experimental investigations, but it does not provide complete solutions. It identifies the dimensionless groups that influence a phenomenon, but experimental data is needed to establish the specific relationships and validate theoretical predictions.
For example, a spherical particle moving through a viscous fluid experiences drag. Dimensional analysis shows that the drag force depends on the particle's diameter, velocity, and...
Two-Compartment Open Model: Extravascular Administration01:12

Two-Compartment Open Model: Extravascular Administration

The two-compartment model for extravascular administration represents a drug's absorption and distribution process. It features a central compartment, where the drug is first absorbed, and a peripheral compartment, which illustrates the drug's distribution throughout the body. The rate of change in drug concentration in the central compartment is calculated by three exponents: absorption, distribution, and elimination.
The absorption exponent (ka) indicates the speed at which the drug is...

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Predicting adsorption isotherms using a two-dimensional statistical associating fluid theory.

Alejandro Martinez1, Martin Castro, Clare McCabe

  • 1Instituto de Fisica, Universidad de Guanajuato, Lomas del Bosque 103, Colonia Lomas del Campestre, Leon 37150, Mexico.

The Journal of Chemical Physics
|March 3, 2007
PubMed
Summary

A new molecular thermodynamics theory accurately describes fluid adsorption on solid surfaces. This model, based on statistical associating fluid theory, shows excellent agreement with simulations for gases like nitrogen and methane.

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Area of Science:

  • Physical Chemistry
  • Thermodynamics
  • Materials Science

Background:

  • Describing fluid adsorption on solid surfaces is crucial for understanding material properties and processes.
  • Existing models may not fully capture the complex interactions involved in adsorption phenomena.

Purpose of the Study:

  • To develop a novel molecular thermodynamics approach for fluid adsorption on solid surfaces.
  • To validate the new theory against established simulation methods.
  • To apply the theory to practical adsorption scenarios.

Main Methods:

  • Utilizing the statistical associating fluid theory for potentials of variable range.
  • Employing a quasi-two-dimensional approximation for adsorbed fluid properties.
  • Comparing theoretical predictions with Gibbs ensemble Monte Carlo simulations.

Main Results:

  • The developed molecular thermodynamics theory provides accurate predictions for fluid adsorption.
  • Excellent agreement was observed between the theory and Gibbs ensemble Monte Carlo simulations.
  • The approach successfully describes adsorption isotherms for nitrogen and methane on activated carbon.

Conclusions:

  • The new molecular thermodynamics theory is a robust tool for modeling fluid-solid adsorption.
  • This approach offers a reliable method for predicting adsorption behavior of gases on porous materials.
  • The findings have implications for materials design and gas separation technologies.