Adsorption Dynamics in Modified Clay Mineral Systems
Summary
Clay minerals, especially smectites such as montmorillonite, possess layered structures with high cation exchange capacity and tunable interlayer spacing that make them versatile adsorbents. Modification strategies—ranging from acid activation to organocation exchange and surface grafting—alter surface charge, porosity and hydrophobicity, thereby governing the rate and extent of adsorption. Adsorption dynamics in these systems reflect the interplay between diffusion into interlayer galleries, surface complexation and multilayer formation. Kinetic and equilibrium models are employed to elucidate sorption pathways, distinguish between physisorption and chemisorption, and predict breakthrough behaviour in real applications. Such modified clays have been deployed globally for water purification, heavy-metal remediation, rare-earth recovery and as carriers in catalysis, underscoring their environmental and industrial significance. Understanding the fundamental processes that control uptake rates, selectivity and desorption informs the design of next-generation sorbents for emerging contaminants and resource reclamation.
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Adsorption Dynamics in Modified Clay Mineral Systems publication trend
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Technical terms
Adsorption dynamics: The temporal and mechanistic aspects of how molecules adhere to solid surfaces.
Cation exchange capacity (CEC): A measure of the total exchangeable positive ions that a clay can adsorb.
Interlayer spacing: The distance between consecutive clay mineral sheets, which controls access to internal sorption sites.
Organoclay: A clay mineral whose exchangeable inorganic cations have been replaced by organic cations to enhance affinity for nonpolar compounds.
Langmuir isotherm: A model describing adsorption where a single monolayer forms on a homogeneous surface with finite binding sites.
Pseudo-second-order kinetics: A rate model assuming the sorption rate is proportional to the square of the number of unoccupied sites, often indicative of chemisorption.
References
- Chemically modified smectites. Clay Minerals (2003).
- Clay Modification by the Use of Organic Cations. Green and Sustainable Chemistry (2012).
- Surface structure of organoclays as examined by X-ray photoelectron spectroscopy and molecular dynamics simulations. Clay Minerals (2015).
- Montmorillonite for Adsorption and Catalytic Elimination of Pollutants from Wastewater: A State-of-the-Arts Review. Sustainability (2022).
- Preparation of Modified Montmorillonite and Its Application to Rare Earth Adsorption. Minerals (2019).
- Adsorption Characteristics of Anionic Surfactant Sodium Dodecylbenzene Sulfonate on the Surface of Montmorillonite Minerals. Frontiers in Chemistry (2018).
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