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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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Density functional theory model of adsorption deformation.

Peter I Ravikovitch¹, Alexander V Neimark

¹Center for Modeling and Characterization of Nanoporous Materials, TRI/Princeton, 601 Prospect Avenue, Princeton, NJ 08542, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 13, 2006

Summary

Adsorbed molecules cause material deformation, leading to contraction or swelling. Nonlocal density functional theory (NLDFT) accurately models this adsorption-induced strain in porous materials like zeolite X.

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Area of Science:

Materials Science
Physical Chemistry
Nanotechnology

Background:

Adsorption of molecules into porous materials induces elastic deformations, causing volume changes (contraction or swelling).
Experimental evidence for adsorption-induced deformation exists in various materials (clays, carbons, zeolites), but a robust theoretical framework is lacking.
Understanding these deformations is crucial for material characterization and performance prediction.

Purpose of the Study:

To develop and validate a theoretical model for adsorption-induced deformation in porous materials.
To quantitatively reproduce experimental adsorption and strain isotherms.
To elucidate the relationship between adsorption stress and material volume changes.

Main Methods:

Nonlocal density functional theory (NLDFT) calculations were employed.
Simulations were performed for Krypton (Kr) and Xenon (Xe) adsorption on zeolite X.
Adsorption and strain isotherms were calculated and compared with experimental data.

Main Results:

The NLDFT model accurately reproduced experimental adsorption and strain isotherms for Kr and Xe on zeolite X.
The model captured the characteristic contraction at low pressures and swelling at high pressures.
Material volume changes were found to be proportional to the calculated solvation (disjoining) pressure.

Conclusions:

NLDFT provides a rigorous theoretical description of adsorption-induced deformation in porous materials.
The model successfully links adsorption phenomena to mechanical responses (strain).
This approach enables better interpretation of adsorption data and characterization of mechanical properties of micro- and mesoporous materials.