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Adsorption Isotherms I01:29

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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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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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Illite spatial distribution patterns dictate Cr(VI) sorption macrocapacity and macrokinetics.

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Illite spatial patterns significantly impact chromium(VI) sorption, with connected low-permeability zones reducing contaminant removal. Understanding subsurface heterogeneity is key for predicting contaminant transport and remediation effectiveness.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Hydrogeology

Background:

  • Chromium(VI) is a widespread contaminant in soil and groundwater.
  • Illite clay's role in contaminant sorption is not fully understood.
  • Subsurface heterogeneity influences contaminant transport and fate.

Purpose of the Study:

  • To investigate how illite spatial distribution affects chromium(VI) sorption.
  • To quantify the impact of varying illite patterns on macrocapacity and macrorates.
  • To improve predictive models for reactive transport in heterogeneous environments.

Main Methods:

  • Flow-through column experiments using packed illite and quartz.
  • Varied spatial patterns and permeability contrasts of illite.
  • Experiments conducted at different flow rates (0.6, 3.0, 15.0 m/day).

Main Results:

  • Sorption macrocapacity and macrorates decreased with increasing transport connectivity.
  • Diffusion-controlled mass transport limitations observed in well-connected, low-permeability illite zones.
  • Heterogeneity effects diminished at higher flow rates approaching chemical kinetics control.

Conclusions:

  • Illite spatial distribution is a critical factor controlling chromium(VI) sorption in heterogeneous subsurface.
  • Predictive models for reactive transport need to incorporate spatial heterogeneity.
  • Findings bridge lab-scale observations and field applications for contaminant management.