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Related Concept Videos

Adsorption Isotherms I01:29

Adsorption Isotherms I

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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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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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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Design Principles for PFAS Adsorption in Three-Dimensional Covalent Organic Frameworks.

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Nitrogen-based covalent organic frameworks (COFs) show promise for adsorbing per- and polyfluoroalkyl substances (PFAS). Material chemistry and pore structure significantly impact PFAS capture efficiency, with functionalization offering further improvements.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Computational Chemistry

Background:

  • Growing concerns exist regarding per- and polyfluoroalkyl substances (PFAS) contamination in water sources.
  • Novel porous materials are needed for effective and selective PFAS adsorption.
  • Covalent organic frameworks (COFs) are a promising class of materials for environmental remediation.

Purpose of the Study:

  • To investigate the influence of chemistry and structure of 3D COFs on perfluorooctanoic acid (PFOA) adsorption.
  • To evaluate the impact of COF functionalization on PFAS adsorption.
  • To identify optimal COF characteristics for enhanced PFAS removal from aqueous environments.

Main Methods:

  • Monte Carlo (MC) simulations were employed to model PFOA adsorption onto various COF structures.
  • The study analyzed the effects of COF porosity, nitrogen-based frameworks, and functional groups (-CF3, -NH2) on adsorption potential.

Main Results:

  • Nitrogen-containing COFs demonstrated a high potential for PFAS adsorption.
  • COF pore porosity significantly affected PFOA adsorption, with moderate porosity being more effective than high porosity.
  • Functionalization with -CF3 and -NH2 groups enhanced PFOA-COF interactions but could reduce necessary porosity.

Conclusions:

  • Nitrogen-based COFs are effective materials for PFAS adsorption.
  • Optimizing COF porosity and functionalization is crucial for maximizing PFOA capture efficiency.
  • Functionalized COFs with appropriate pore sizes offer a pathway for improved PFAS removal from water.