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Adsorption of Gases on Solids01:28

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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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CO2 adsorption using TiO2 composite polymeric membranes: A kinetic study.

Sarah Hafeez1, X Fan2, Arshad Hussain3

  • 1School of Chemical and Materials Engineering (SCME), National University of Sciences & Technology, Islamabad, Pakistan; Institute for Materials and Processes, School of Engineering, University of Edinburgh, Scotland, UK.

Journal of Environmental Sciences (China)
|September 11, 2015
PubMed
Summary

This study shows that cellulose acetate-titania nanoparticle composite membranes effectively capture carbon dioxide (CO2). These membranes enhance CO2 adsorption, diffusion, and solubility, leading to improved gas separation performance.

Keywords:
CO(2)Cellulose acetateGas adsorptionGlobal warmingPseudo order modelsTiO(2)

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Carbon dioxide (CO2) is a primary greenhouse gas driving global climate change.
  • Membrane gas separation, especially using composite membranes, is a rapidly advancing CO2 capture technology.
  • CO2 separation via membranes relies on gas diffusion and solubility, not just physical sieving.

Purpose of the Study:

  • To investigate carbon dioxide (CO2) adsorption in pure and composite membranes.
  • To understand the influence of adsorption on CO2 diffusion and solubility.
  • To explore the potential of cellulose acetate-titania nanoparticle (CA-TiO2) composite membranes for enhanced CO2 capture.

Main Methods:

  • Fabrication of pure cellulose acetate (CA) and CA-TiO2 composite membranes.
  • Characterization of membranes using Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR).
  • Investigating CO2 adsorption behavior and modeling the kinetics using Pseudo first-order, pseudo second-order, and intra-particle diffusion models.

Main Results:

  • CA-TiO2 composite membranes exhibited significantly higher CO2 adsorption capacity compared to pure CA membranes.
  • The enhanced CO2 adsorption in CA-TiO2 membranes is hypothesized to improve CO2 diffusion and solubility.
  • The Pseudo second-order model best described the experimental adsorption data, with intra-particle diffusion not being the sole mechanism.

Conclusions:

  • Cellulose acetate-titania nanoparticle composite membranes demonstrate superior CO2 adsorption capabilities.
  • These composite membranes offer enhanced diffusion and solubility, leading to improved CO2 separation efficiency.
  • The findings support the use of advanced composite membranes for effective carbon capture technologies.