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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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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...
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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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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
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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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A computational study of carbon dioxide adsorption on solid boron.

Qiao Sun1, Meng Wang, Zhen Li

  • 1Centre for Theoretical and Computational Molecular Science, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Brisbane, Australia. q.sun@uq.edu.au d.bernhardt@uq.edu.au.

Physical Chemistry Chemical Physics : PCCP
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Boron materials like α-B12 and γ-B28 show strong carbon dioxide (CO2) adsorption potential. Theoretical studies suggest these materials are promising for CO2 capture, aiding climate change mitigation.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Computational Chemistry

Background:

  • Anthropogenic carbon dioxide (CO2) emissions drive climate change.
  • CO2 capture and sequestration offer a partial mitigation strategy.
  • Novel materials are needed for efficient CO2 adsorption.

Purpose of the Study:

  • To theoretically investigate CO2 adsorption on boron phases α-B12 and γ-B28.
  • To evaluate the binding strength and capacity of these boron materials for CO2 capture.
  • To assess the kinetic and thermodynamic feasibility of CO2 capture on boron.

Main Methods:

  • Comprehensive theoretical study using computational methods.
  • Analysis of CO2 adsorption on α-B12 and γ-B28 boron phases.
  • Calculations performed at various CO2 coverage levels.

Main Results:

  • Electron-deficient boron materials exhibit strong bonding with CO2.
  • Lewis acid-base interactions and surface electron density facilitate CO2 adsorption.
  • CO2 capture on boron phases is found to be kinetically and thermodynamically feasible.

Conclusions:

  • α-B12 and γ-B28 boron phases demonstrate significant potential for CO2 capture.
  • These boron materials are predicted to be effective candidates for CO2 sequestration applications.
  • The findings support the use of boron-based materials in climate change mitigation efforts.