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Related Concept Videos

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...
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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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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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Methane and carbon dioxide adsorption on edge-functionalized graphene: a comparative DFT study.

Brandon C Wood1, Shreyas Y Bhide, Debosruti Dutta

  • 1Quantum Simulations Group, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

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|August 17, 2012
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Chemical functionalization of carbon nanostructures significantly enhances gas binding, particularly for carbon dioxide (CO2) over methane (CH4). Specific functional groups like NH2 and COOH are key for optimizing gas storage and separation in nanoporous materials.

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Published on: February 1, 2020

Area of Science:

  • Materials Science
  • Computational Chemistry
  • Nanotechnology

Background:

  • Nanoporous carbon materials are crucial for gas storage and separation.
  • Understanding gas binding at the nanoscale is essential for material optimization.
  • Chemical functionalization offers a pathway to tune material properties.

Purpose of the Study:

  • To investigate the impact of chemical functionalization on gas binding within carbon nanostructures.
  • To explore the binding of carbon dioxide (CO2) and methane (CH4) to functionalized graphene nanoribbon edges.
  • To identify functional groups that enhance gas uptake and selectivity.

Main Methods:

  • Ab initio density functional theory (DFT) calculations were employed.
  • Model zigzag graphene nanoribbons with various edge functionalizations were studied.
  • Analysis included geometry, energetics, and charge distribution of gas adsorption.

Main Results:

  • Carbon dioxide (CO2) binding was approximately twice as strong as methane (CH4) binding.
  • NH2, H2PO3, NO2, and COOH functional groups significantly enhanced gas binding.
  • Binding strength correlated with the dipole moments of the functional groups.
  • Gas binding trends were consistent across different functional groups despite varying molecular symmetries.

Conclusions:

  • Edge functionalization can transform carbon nanostructure edges into effective gas binding sites.
  • Tailoring functional groups allows for enhanced gas uptake and improved CO2/CH4 selectivity.
  • These findings have implications for designing advanced materials for gas storage and separation.