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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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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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Glycerol Adsorption on TiO2 Surfaces: A Systematic Periodic DFT Study.

Andrés Camilo Muñoz Peña1,2, Elizabeth Flórez2, Francisco Núñez-Zarur2,3

  • 1Chemistry and Biochemistry Department, New Mexico State University, 88001, Las Cruces, NM, USA.

Chemistryopen
|January 29, 2025
PubMed
Summary
This summary is machine-generated.

Glycerol adsorption on titanium dioxide (TiO2) surfaces was studied. Anatase (001) showed the highest reactivity, leading to molecular and dissociative adsorption, unlike the less reactive anatase (101).

Keywords:
Adsorption energyGlycerol adsorptionTiO2Titanium dioxideab initio calculation

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Computational Chemistry

Background:

  • Glycerol conversion to valuable products is crucial due to its abundance from biodiesel production.
  • Titanium dioxide (TiO2) is a widely investigated catalyst for such transformations.
  • Understanding glycerol adsorption on different TiO2 facets is key to catalyst design.

Purpose of the Study:

  • To systematically investigate glycerol adsorption on anatase (101), anatase (001), and rutile (110) TiO2 surfaces.
  • To determine the adsorption energies and modes (molecular vs. dissociative) for each facet.
  • To analyze the impact of surface structure and defects on glycerol adsorption.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Systematic study of glycerol adsorption on three distinct TiO2 crystal facets.
  • Analysis of adsorption energies, modes, surface reconstructions, electronic structure, and charge transfer.

Main Results:

  • Anatase (001) exhibited the highest reactivity, facilitating both molecular and dissociative adsorption with significant surface reconstruction.
  • Rutile (110) also showed molecular and dissociative adsorption but was less reactive than anatase (001).
  • Anatase (101) was the least reactive, with only molecular adsorption and weaker binding energies.
  • Oxygen vacancies influenced adsorption states and energies.
  • Glycerol adsorption primarily affected the band gap, with strong adsorption linked to substantial charge transfer.

Conclusions:

  • The reactivity of TiO2 facets towards glycerol varies significantly, with anatase (001) being the most active.
  • Adsorption mechanisms (molecular vs. dissociative) and surface interactions are dependent on the specific TiO2 crystal face.
  • DFT provides valuable insights into glycerol-TiO2 interactions, guiding future catalyst development for glycerol valorization.