Adsorption Mechanisms in Pillared Clay Systems
Summary
The intercalation of polyoxocations or inorganic cations into layered silicate minerals gives rise to pillared clays characterised by enhanced basal spacing, high surface area and tailored porosity. These structural modifications create a stable network of pillars that prevent layer collapse and provide a diverse array of adsorption sites. Adsorption in such systems is governed by a combination of physisorption and chemisorption processes. Electrostatic attraction between charged surfaces and ionic species plays a key role, particularly when pillaring agents carry residual charges that interact with adsorbates. Hydrogen bonding and van der Waals forces further contribute to the uptake of neutral or weakly polar molecules, while specific inner-sphere complexation may occur between functional groups on the pillar network (for example, metal–oxygen centres) and target contaminants. The nature and density of pillars determine pore-size distribution and surface chemistry, which in turn influence selectivity, kinetics and capacity. Experimental studies typically employ kinetic models (pseudo-first-order and pseudo-second-order) to elucidate rate-determining steps and thermodynamic isotherms (Langmuir, Freundlich and Sips) to interpret equilibrium behaviour. Fine tuning of synthesis parameters—such as the choice of polycation, ageing time and calcination temperature—enables the optimisation of adsorption performance for diverse applications, including water treatment, pollutant removal and gas separation.
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Adsorption Mechanisms in Pillared Clay Systems publication trend
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Technical terms
Pillared clay: A layered silicate in which inorganic cations or polyoxocations are inserted between sheets to maintain interlayer distance and generate porosity.
Basal spacing: The repeat distance between adjacent clay layers, typically measured by X-ray diffraction.
Keggin polycation: A robust aluminium-based polyoxocation (Al13 cluster) commonly used as a pillaring agent.
Inner-sphere complexation: A chemisorption mechanism involving direct coordination bonds between adsorbate and surface metal centres.
Chemisorption: An adsorption process in which adsorbate molecules form strong chemical bonds with the adsorbent surface.
References
- Enhanced Adsorption of Methyl Orange by Mongolian Montmorillonite after Aluminum Pillaring. Applied Sciences (2022).
- Comparative Study of the Physico-Chemical Properties of Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminium (III) Polyhydroxocations. Coatings (2023).
- Silica Pillared Montmorillonites as Possible Adsorbents of Antibiotics from Water Media. Applied Sciences (2018).
- Keggin-Al13 Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays. Minerals (2021).
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