Functionalized Clay Materials for Environmental Remediation
Summary
Functionalized clay materials have emerged as versatile adsorbents in environmental remediation owing to their layered structure, high surface area and tunable surface chemistry. Natural clays such as montmorillonite, bentonite, saponite and kaolin possess a net negative charge and significant cation exchange capacity, enabling capture of cationic pollutants. However, pristine clays often lack selectivity for organic micropollutants or hydrophobic compounds. Functionalisation strategies—such as organic cation grafting, pillaring with metal polycations, silane coupling and biopolymer coating—expand the range of targets to include dyes, pharmaceuticals, heavy metals and other emerging contaminants. These modified clays demonstrate enhanced affinity, rapid adsorption kinetics and improved structural stability. Their low cost, high abundance and potential for regeneration underpin their appeal for large-scale water treatment operations. Recent innovations have focused on hybrid composites, hierarchical porosity and recyclable designs, highlighting the potential for sustainable deployment in municipal and industrial settings. Integrating these materials with existing filtration, membrane or catalytic processes offers routes to intensify removal efficiency while minimising secondary waste.
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Functionalized Clay Materials for Environmental Remediation publication trend
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Technical terms
Cation exchange capacity (CEC): Measure of a clay’s ability to exchange cations between interlayer sites and the surrounding solution.
Pillared clay: Clay whose interlayers are propped open by metal polyoxocations, forming a stable porous framework with enlarged surface area.
Intercalation: Insertion of molecules or ions between clay layers to modify surface properties and create additional adsorption sites.
Langmuir isotherm: Model describing monolayer adsorption onto a uniform surface with a finite number of identical sites.
Adsorption kinetics: Study of the rate at which adsorbates accumulate on adsorbent surfaces, often represented by pseudo-first or pseudo-second-order models.
References
- An overview about synthetic high charge micas and their uses. Applied Clay Science (2024).
- Adsorption kinetics of malachite green and methylene blue from aqueous solutions using surfactant-modified organoclays. Acta Chimica Slovenica (2017).
- Characterization and Adsorption Study of Thymol on Pillared Bentonite. Open Journal of Physical Chemistry (2014).
- Natural Minerals Coated by Biopolymer Chitosan: Synthesis, Physicochemical, and Adsorption Properties. Discover Nano (2016).
- A facile method to modify bentonite nanoclay with silane. International Nano Letters (2017).
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