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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 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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Related Experiment Video

Updated: Mar 7, 2026

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Two microporous Fe-based MOFs with multiple active sites for selective gas adsorption.

Yun-Wu Li1, Hui Yan2, Tong-Liang Hu3

  • 1School of Chemistry and Chemical Engineering, School of Materials Science and Engineering, School of Pharmacy, and Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, Liaocheng University, Liaocheng 252000, P. R. China. dougroup@163.com and School of Materials Science and Engineering, College of Chemistry, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, P. R. China. jxu@nankai.edu.cn buxh@nankai.edu.cn.

Chemical Communications (Cambridge, England)
|February 9, 2017
PubMed
Summary

Two new iron-based metal-organic frameworks (MOFs) demonstrate highly selective carbon dioxide (CO2) adsorption over methane (CH4) and nitrogen (N2), due to their unique structures and active sites.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are promising materials for gas adsorption.
  • Developing MOFs with high selectivity for specific gases is crucial for separation technologies.

Purpose of the Study:

  • To synthesize and characterize novel Fe-based porous MOFs.
  • To investigate the selective CO2 adsorption properties of these MOFs over CH4 and N2.

Main Methods:

  • Construction of MOFs using dimeric Fe-clusters and {Fe2Na3}n chains as secondary building units (SBUs).
  • Gas adsorption experiments to evaluate selectivity for CO2, CH4, and N2.

Main Results:

  • Two distinct Fe-based porous MOFs were successfully synthesized.
  • Both MOFs exhibited superior selectivity for CO2 adsorption compared to CH4 and N2.
  • The selectivity is attributed to abundant multiple active sites within the MOF structures.

Conclusions:

  • The designed Fe-based MOFs show significant potential for selective CO2 capture.
  • The study highlights the importance of structural design in achieving high gas selectivity in MOFs.