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Related Concept Videos

Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

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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 I01:29

Adsorption Isotherms I

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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...
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Adsorption Isotherms II01:25

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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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Related Experiment Video

Updated: Apr 22, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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Exceptional CO2 adsorbing materials under different conditions.

Mahasweta Nandi1, Hiroshi Uyama

  • 1Department of Integrated Science Education and Research, Siksha Bhavana, Visva-Bharati, Santiniketan, 731 235, India. mahasweta.nandi@visva-bharati.ac.in.

Chemical Record (New York, N.Y.)
|October 15, 2014
PubMed
Summary

Researchers reviewed materials with high carbon dioxide (CO2) adsorption capacities. Key factors include high surface area, pore volume, and specific chemical groups, enhancing CO2 capture for climate change mitigation.

Keywords:
carbon storagemetal-organic frameworkspolymerssilicateszeolites

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Greenhouse gas emissions, particularly carbon dioxide (CO2), pose significant environmental challenges.
  • Effective CO2 capture technologies are crucial for mitigating climate change.
  • Adsorption is a promising method for CO2 capture, requiring efficient adsorbent materials.

Purpose of the Study:

  • To identify and review materials exhibiting the highest adsorption capacities for CO2.
  • To categorize these materials based on their structural and chemical properties.
  • To understand the key factors influencing CO2 adsorption performance.

Main Methods:

  • Literature review and synthesis of existing research on CO2 adsorbents.
  • Categorization of materials into porous carbon, metal-organic frameworks, zeolites, mesoporous silicas, and porous organic frameworks.
  • Analysis of structure-property relationships governing CO2 adsorption.

Main Results:

  • Materials with high surface area, pore volume, and nitrogen, oxygen, or sulfur-containing functional groups show superior CO2 adsorption.
  • Microporous structures and strong interactions (H-bonding, dipole-quadrupole) between CO2 and the adsorbent framework enhance adsorption capacity.
  • Specific material classes like metal-organic frameworks and porous carbons demonstrate exceptionally high CO2 uptake.

Conclusions:

  • Material design focusing on high surface area, tailored pore sizes, and specific functional groups is key for efficient CO2 capture.
  • Understanding the adsorption mechanisms, including chemical interactions, is vital for developing next-generation CO2 adsorbents.
  • These findings guide the selection and development of advanced materials for effective carbon capture and storage (CCS).