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Adsorption of Gases on Solids

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...

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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 Isotherms II

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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...

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Updated: Jul 8, 2026

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Published on: April 15, 2013

Modelling the adsorption on oxidized carbon nanotubes using a statistical mechanics approach.

Márcio Oliveira Alves¹, Paulo Fernando Ribeiro Ortega², Felipe Silva Carvalho³

¹Departamento de Controle Ambiental e Química, Centro Federal de Educação Tecnológica de Minas Gerais, Contagem, MG, 32146-054, Brazil. marcioalves@cefetmg.br.

Journal of Molecular Modeling

|September 15, 2022

Summary

Oxidation of carbon nanotubes enhances pollutant removal via adsorption. This study used a statistical mechanics model to reveal adsorption mechanisms, including molecular orientation and layer formation, crucial for optimizing this environmental remediation technique.

Keywords:

Adsorption Carbon nanotube Statistical mechanics

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Published on: February 12, 2019

Area of Science:

Materials Science
Environmental Science
Physical Chemistry

Background:

Carbon nanotubes (CNTs) are explored for pollutant removal through adsorption.
Functionalization of CNTs can improve adsorption efficiency.
Mechanisms of adsorption on CNTs require further elucidation.

Purpose of the Study:

To investigate the impact of CNT oxidation on methylene blue adsorption.
To understand the underlying adsorption mechanisms using a theoretical model.
To quantify adsorption properties like layer number and molecular orientation.

Main Methods:

Utilized a realistic model based on the grand canonical ensemble.
Adjusted experimental adsorption isotherms to fit the model.
Employed statistical mechanics to calculate thermodynamic properties.

Main Results:

Oxidation significantly influences the adsorption behavior of methylene blue on CNTs.
The model successfully determined the number of adsorbed layers and molecular orientation.
Configurational entropy and Gibbs free energy of adsorption were calculated.

Conclusions:

Oxidation is a key factor in tailoring CNTs for efficient pollutant adsorption.
The statistical mechanics model provides deep insights into adsorption processes on nanomaterials.
Understanding these mechanisms is vital for designing advanced adsorbent materials.